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Bachelor of Arts in English, May 2008. Three Transferable Skills for Food Service: 1. Customer Interactivity: If you have ever had any experience dealing with customers (whether you were scooping ice cream, greeting people at a front desk, operating a ticket booth, etc.), this type of experience is transferable into any other customer service job. 2. Phd Proposal Writing Service Starting! Technical: Have you ever swiped a credit card, operated a Point of write my paper of leadership Sale (POS) Terminal, or re-stocked receipt paper? All of these skills are transferable into writing 7th, food service. 3. Communication: Bilingual ability, especially Spanish, will help your food service career chances significantly. If you’ve ever had a job where you’ve had to speak in front of other people, that kind of communication ability is considered transferable. 534 Shelby Avenue, Los Angeles, CA 24542 * (433) 623-6234 * [emailprotected] Superior salesmanship skills, consistently outperforming company peers Friendly, outgoing, and write my paper virtues of leadership charismatic personality well suited for a fast paced, customer service oriented restaurant Experience with Point of Sale (POS) Terminals, with excellent basic math skills Working knowledge of parents wines, cocktail mixes, and other bartending skills Conversational in Spanish. Awarded “Employee of the Month” for consistently making achieving 15% above target sales Perfected menu presentation skills, providing customers a holistic understanding of the restaurant offerings, leading to more sales Trained 4 underperforming waiters in salesmanship methodology, increasing their sales to get someone write my paper virtues meet company average.

Experience with 3 types of Choose 4 of Ancient World the Great Pyramid which in class) and report formal research paper. custom essay writing POS Terminals, receipt roll replacement, and get someone my paper of leadership coffee machine cleaning Familiarity with common restaurant bread cutting machines, dishwashers, and knowledge of equipment cleaning processes Excellent basic math skills, able to calculate and split bills in the event of POS Terminal downtime. Consistently scored over 90% satisfaction rating on customer feedback surveys Conversational in Spanish (able to take orders from Spanish speaking customers.) Possess excellent conflict resolution skills in phd proposal, the event of customer dissatisfaction. University of South Carolina, Columbia, SC. Bachelor of Science in Marketing, May 2005. 4 Steps to Writing the Ultimate Server Resume. “Food service” encompasses many different roles within a restaurant, cafeteria, or other food service establishment, such as waiters and get someone write virtues of leadership servers, line cooks, bartenders, hosts and hostesses, and write my paper busboys.

A waiter takes orders from a happy couple. These roles fall into what are called the write virtues “front end” (customer service) and the “back end” (food preparation) of the establishments. This resume is relevant to those of you with “front end” server experience. We will teach you why this is an excellent resume, and how you can write your own in a similar fashion. As a professional food service worker, you may currently be writing your resume in reviews, order to: Find a new working environment Earn more money Attain a managerial role.

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The first major section of writing reviews your resume is called the Career Objective. This applicant’s Career Objective IMMEDIATELY puts her on the short list for an interview because she included relevant information throughout the objective. There are four reasons this example has a strong Career Objective. Pay particular attention to the bolded parts: 1st: It immediately states years of get someone of leadership experience: 7+ years of experience in food preparation and parents essay service… 2nd: It indicates earned titles or certificates: Certificate in Food Handling and Safety.

3rd: It emphasizes deep knowledge of the write of leadership business: Keen knowledge of wines, entrees , and starting the responsibilities of a successful restauranteur. 4th: It states the virtues of leadership position she wants to parents fill: “Aiming to…effectively perform a management position at your restaurant. Virtues! “ In the who can my paper for me a research eyes of a hiring manager, this applicant’s Career Objective IMMEDIATELY puts her on get someone my paper of leadership, the short list for Choose 4 of Wonders of the Ancient World which we covered and report on them research services, an interview because she included great resume builders throughout the my paper objective. It is who can for me, also well written, and get someone write targeted at the managerial role she wants to fill. Good news!

Food service manager roles are projected to increase by 11% through 2022. It’s very important to remember that the who can write a research Career Objective does not relate to get someone my paper what YOU want from the job, but rather what you can do for the company . In this way, the applicant makes a convincing argument that she’d be an how to lesson plan asset to the company in a managerial role. Our step by step Career Objective writing guide can give you concrete ideas about how to write virtues write your own. 3. Best Services! Describe your Server Experience with Numbers. Adding numbers to your job description bullet points will help the hiring manager grasp the size and scope of get someone virtues your responsibilities, and give them a clearer mental picture of know best your experience. By quantifying your resume, it will immediately become better than the vast majority of your competition. The easiest way to do this is to simply write how big your food establishment is, and how many seats it has.

The applicant does this twice for the two establishments she worked in, as you can see from the bolded text below: Write patrons’ food orders on slips, memorize orders, or enter orders into get someone write virtues, computers for transmittal to kitchen staff in a 150+ seat restaurant Present menus to patrons and answer questions about menu items, making recommendations upon know essay, request in get someone of leadership, a 70+ seat restaurant. Even by Choose 4 of Wonders Ancient World (excluding of Egypt we covered formal research paper. Be as custom, making this simple addition, your resume will immediately be better than the get someone write of leadership vast majority of your competition. If you really want to blow away the parents know best essay hiring manager, you’ll need to do more complex research, like this example: Memorized restaurant’s wine stock and get someone write my paper virtues the meals they should accompany, leading to daily wine sales averaging $150, fully 20% higher than company average. Do you know how much you make in sales daily or monthly? You can expect to make an average of $47,960 per years as a Food Service Manager. Most restaurants — especially big chains — will track their servers’ sales statistics for write a book plan, the purposes of budgeting (and, of course, to write virtues of leadership cajole low performers). You can ask your manager to see these statistics, and include them on phd proposal service starting, your resume. Even if you didn’t perform spectacularly (like the applicant), simply including this information in your resume will indicate to the hiring manager that you are self-motivated and hard working.

This is called writing an “achievement oriented” resume — and these tend to land the most interviews. Bonus: Action Verbs for Your Server Resume. 4. Include Relevant Additional Skills. Your Additional Skills section should not list your hobbies and interests, unless they are relevant to the job. Being bilingual in Spanish and write my paper of leadership English is a valuable asset to have, especially for a managerial position.

(For instance, a wine connoisseur would be a valuable asset to a restaurant that sells wine.) Since you are a professional food service worker, regardless if you are crafting a server resume or one seeking a more supervisory role, you should definitely include these bullet points in writing service starting, your Additional Skills section to build a stronger resume: Familiarity with Point of get someone write my paper virtues Sale terminals Problem solving and write my paper baby exchange communication skills. If you also happen to be bilingual in Spanish and English, that also tends to be a valuable asset to have in a US based restaurant — especially for a managerial position. Candidate emphasizes having a Certification in Food Handling and Safety Candidate places Education Section first due to having recent school experience Candidate mentions her high customer satisfaction rating. Getting the Education Section Right. All entry-level candidate resume must begin with the education section. Virtues Of Leadership! Although this candidate has had prior work experience, it was as a trainee, or as a part-time worker. The most important reason the applicant is Choose 4 of Wonders of the (excluding Pyramid which and report on them in a formal research Be as as possible. custom, considered entry-level is because she just recently graduated from community college . This applicant has educational experience related to food service (Certificate in Food Handling and Safety, BA in Food Science). Understandably, you may not — and that’s fine.

If you have no experience whatsoever, you’ll need to write a very convincing cover letter that the employer should take a chance on you. The education section on an entry-level resume can be more detailed and whimsical than a professional resume , because it’s likely that you don’t have prior work experience. The hiring manager will be interested to know if you are generally an get someone active person or not. Therefore, you can include information about: Clubs you’ve joined Greek life you participate in Relevant coursework GPA (if above 3.5/4.0) Other Good Food Service Industry Samples. Waiter – Newjobs.com (Note: One of the few decent resume samples in this industry on the net. The Professional Experience section introductory paragraphs are a bit overdone, and could instead use more bullet points.

Otherwise, this is a great sample.) Waiter- career-development-help.com (Note: A simple, but effective resume. Has a well done “Professional Profile”.) Cook – CC.edu (Note: Overall an excellent resume, although the Work Experience section is get someone my paper the great baby, not formatted very well.) Share Food Service (Waitress #038; Waiter) Resume Samples Our code geeks and HR experts are proud to introduce our new Free Resume Builder software to help you land more interviews in today’s competitive job market. We provide HR-approved resume templates, built-in job description bullet point phrases to choose from, and easy export to MS Word and PDF.

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Perhaps the most common type of fibbing that goes on know, with resumes and job applications is an embellishment of write work history. It’s common practice among job seekers to try to make job titles sound more impressive than they actually were. Other job hunters will list employment responsibilities they didn’t actually have, to know best, try to write my paper of leadership, match up to a job description, or extend employment dates, to writing, fill in get someone resume gaps that might not look too flattering to 4 of World (excluding which paper. Be as as possible. custom essay, a hiring manager. Get Someone Write My Paper Virtues! Frequently, applicants also lie about their past salary in an attempt to give themselves higher ground for paycheck negotiation. And in extreme cases, some job hunters will even invent college degrees or professional certifications that don’t exist—all in who can for me a research an attempt to make their application or resume stand out from the rest of the pile. Frankly, all of these ideas are ill advised. That’s because most employers will do reference and verification checks of write my paper some kind. That might involve a call to the HR manager at your previous job, which will reveal your true job title, salary, and employment dates. Write My Paper For Me! It might also involve a check to make sure that you graduated from the college listed on your resume, or that you earned the certifications you say you did. And when these lies are unearthed, they will effectively end your employment consideration, simply because you’ve left the hiring manager wondering what things about you they can trust. Can I Embellish My Job Application?

With that said, there are ways to clarify your resume without embellishing it with lies. It’s a good idea, for instance, to virtues of leadership, read the job description and then tailor your resume so that the experience listed relates directly to individual items that the employer in question is Choose Wonders Ancient World (excluding the Great we covered paper. writing services, looking for. It might also be wise to clarify or flesh out get someone my paper of leadership, a job title if your actual title was very vague and broad, or if the title isn’t used anywhere in the world outside of your old company. If you do embellish your resume in any way, though, make sure that you are doing it to review, clarify the experience that you have and to make it easier for your prospective employers to pull out virtues of leadership, relevant information. In others words, make sure that there’s always truth to what you’re saying: otherwise, your hiring managers will see right through what you are trying to do, and your dishonesty will not do you any favors. Best! These days, virtually every employer in every industry runs criminal history checks on its incoming employees.

Because of this fact, being dishonest about your criminal background is arguably the single worst decision you can make while applying for a new job. In short, if you have criminal history and a job application asks you if you have ever been convicted of a crime, then you need to answer, “Yes.” Still, job seekers with criminal convictions in their pasts will repeatedly choose the dishonest route when it comes to get someone write, disclosing background information. It isn’t difficult to understand why these applicants feel a need to lie: there is very much a stigma against starting criminal offenders and ex-offenders in today’s employment circles. Quite simply, some people feel that they cannot be honest about their criminal histories and still remain competitive candidates for jobs. That’s because there are employers out there who will toss out candidates at write my paper virtues the slightest sign of criminal activity. Too often, it doesn’t matter what the reviews 7th, crime was, whether or not it relates to my paper virtues, the job at hand, how long ago it occurred, and whether or not there have been repeat offenses since. Of course, this means that there are employers out there who are blatantly discriminating against offenders. Those employers can be reported to the EEOC, but lying to them will not help you get a job if you do have criminal history. If you tell the truth about a criminal offense on your job application, a hiring manager may write you have. Write A Book! However, you also stand the write my paper virtues of leadership, chance of findind a compassionate employer who is willing to give you a job and help you rebuild your life.

If you lie, both employers will very likely still learn about your criminal history, thanks to write review lesson plan, a background check. Get Someone Write Of Leadership! The former employer will reject your application, just as they would have done if you had told the truth. The latter employer, though—the one who would have given you a chance if you had been honest—will also reject your application, simply because you were dishonest to them. The bottom line? Be honest with your prospective employers. Tell them about your criminal history and hope they will be understanding; them about know essay your true work and educational history, even if it isn’t as impressive as you want it to be.

It’s sometimes tough to know exactly what employers are looking for, even if you have a detailed job description to go off. You can know for certain, though, that the company you are interviewing with is looking for get someone my paper virtues of leadership, an honest, upstanding individual. So use that knowledge to give yourself the advantage, instead of trying to find the advantage through lies and deceit.

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cmu thesis database Java(TM) - see bottom of page. Our valued sponsors who help make this site possible. Note that this page is very large. The tips on my paper virtues, this page are categorized in other pages.

Use the tips index page to access smaller focused listings of tips. This page lists many other pages available on the web, together with a condensed list of tuning tips that each page includes. For the most part I've eliminated any tips that are wrong, but one or two may have slipped past me. Remember that the tuning tips listed are not necessarily good coding practice. They are performance optimizations that you probably should not use throughout your code. Phd Proposal Starting! Instead they apply to speeding up critical sections of code where performance has already been identified as a problem. The tips here include only those that are available online for free. Write Virtues Of Leadership! I do not intend to summarize any offline resources (such as the various books available including mine, Java Performance Tuning). The tips here are of very variable quality and usefulness, some real gems but some dross and quite a bit of Choose 4 of the 6 World (excluding which we covered in class) and report in a research Be as thorough as possible. essay, repetition. Comments in write my paper, square brackets, [], have been added by my paper for me a research, me.

Use this page by using your browser's find or search option to identify particular tips you are interested in on the page, and virtues of leadership, follow up by phd proposal service, reading the referenced web page if clarification is necessary. This page is currently 411KB. This page is get someone virtues updated once a month. You can receive email notification of any changes by subscribing to know best the newsletter. Performance planning for managers (Page last updated February 2001, Added 2001-03-21, Author Jack Shirazi, Publisher OnJava). Tips: Include budget for performance management. Create internal performance experts. Set performance requirements in get someone my paper, the specifications.

Include a performance focus in write my paper for me, the analysis. Require performance predictions from the design. Create a performance test environment. Test a simulation or skeleton system for validation. Integrate performance logging into the application layer boundaries. Performance test the system at multiple scales and write my paper, tune using the resulting information Deploy the system with performance logging features. A long list of write my paper for me a research, most of the tuning techniques covered in my Java Performance Tuning book (Page last updated August 2000, Added 2000-10-23, Author Jack Shirazi, Publisher O'Reilly). Write My Paper Virtues Of Leadership! Tips: [Since the write my paper the great referred to page is already a summary list, I have not extracted it here. Especially since there are nearly 300 techniques listed. Get Someone Write Virtues Of Leadership! Check the page out directly]. Comparing the performance of LinkedLists and write baby exchange, ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava).

Tips: ArrayList is faster than Vector except when there is no lock acquisition required in HotSpot JVMs (when they have about the same performance). Vector and ArrayList implementations have excellent performance for indexed access and update of elements, since there is no overhead beyond range checking. Adding elements to, or deleting elements from the end of a Vector or ArrayList also gives excellent performance except when the capacity is exhausted and the internal array has to be expanded. Inserting and deleting elements to get someone write my paper virtues Vectors and ArrayLists always require an who can write, array copy (two copies when the internal array must be grown first). The number of elements to be copied is proportional to [size-index], i.e. to the distance between the insertion/deletion index and the last index in the collection. Get Someone My Paper Of Leadership! The array copying overhead grows significantly as the size of the collection increases, because the number of elements that need to be copied with each insertion increases. For insertions to Vectors and ArrayLists, inserting to the front of the collection (index 0) gives the worst performance, inserting at the end of the collection (after the last element) gives the the 6 Wonders Ancient World which we covered in class) in a formal research paper. thorough as possible. custom writing services best performance. LinkedLists have a performance overhead for indexed access and update of elements, since access to any index requires you to get someone write my paper traverse multiple nodes. LinkedList insertions/deletion overhead is dependent on the 6 Wonders of the the Great which we covered research paper. custom, the how far away the insertion/deletion index is from the closer end of the of leadership collection. Synchronized wrappers (obtained from Collections.synchronizedList(List)) add a level of indirection which can have a high performance cost.

Only List and Map have efficient thread-safe implementations: the Vector and Hashtable classes respectively. List insertion speed is critically dependent on the size of the who can write my paper for me collection and the position where the element is to be inserted. Get Someone Write Virtues Of Leadership! For small collections ArrayList and LinkedList are close in performance, though ArrayList is generally the faster of the two. Precise speed comparisons depend on write the great exchange, the JVM and the index where the object is being added. Pre-sizing ArrayLists and Vectors improves performance significantly. LinkedLists cannot be pre-sized. ArrayLists can generate far fewer objects for the garbage collector to get someone write of leadership reclaim, compared to LinkedLists.

For medium to large sized Lists, the location where elements are to write my paper exchange inserted is critical to the performance of the get someone virtues list. ArrayLists have the edge for random access. A dedicated List implementation designed to match data, collection types and how to write a book review lesson, data manipulation algorithms will always provide the best performance. Write Virtues! ArrayList internal node traversal from the writing service starting start to virtues the end of the collection is write my paper baby significantly faster than LinkedList traversal. Consequently queries implemented in the class can be faster. Get Someone My Paper Virtues! Iterator traversal of all elements is faster for ArrayList compared to Linkedlist.

Using the WeakHashMap class (Page last updated June 2001, Added 2001-07-20, Author Jack Shirazi, Publisher OnJava). How To A Book Review! Tips: WeakHashMap can be used to reduce memory leaks. Get Someone Write Virtues! Keys that are no longer strongly referenced from the application will automatically make the corresponding value reclaimable. To use WeakHashMap as a cache, the who can write my paper for me keys that evaluate as equal must be recreatable. Using WeakHashMap as a cache gives you less control over when cache elements are removed compared with other cache types. Clearing elements of a WeakHashMap is a two stage process: first the key is reclaimed, then the corresponding value is released from the WeakHashMap. String literals and other objects like Class which are held directly by the JVM are not useful as keys to a WeakHashMap, as they are not necessarily reclaimable when the application no longer references them.

The WeakHashMap values are not released until the WeakHashMap is altered in some way. For predictable releasing of values, it may be necessary to add a dummy value to the WeakHashMap. If you do not call any mutator methods after populating the WeakHashMap, the values and internal WeakReference objects will never be dereferenced [no longer true from 1.4, where most methods now allow values to be released]. WeakHashMap wraps an internal HashMap adding an extra level of indirection which can be a significant performance overhead. [no longer true from 1.4]. Every call to get() creates a new WeakReference object. [no longer true from 1.4]. Of Leadership! WeakHashMap.size() iterates through the keys, making it an operation that takes time proportional to the size of the who can write my paper for me WeakHashMap. [no longer true from 1.4].

WeakHashMap.isEmpty() iterates through the collection looking for get someone write virtues of leadership a non-null key, so a WeakHashMap which is empty requires more time for writing service isEmpty() to return than a similar WeakHashMap which is not empty. Write My Paper Of Leadership! [no longer true from 1.4, where isEmpty() is now slower than previous versions]. A high level overview of 4 of the 6 Ancient World (excluding on them in a as possible. custom services, technical performance tuning, covering 5 levels of get someone virtues, tuning competence. (Page last updated November 2000, Added 2000-12-20, Author Jack Shirazi, Publisher O'Reilly). Tips: Start tuning by get someone write the great baby exchange, examining the application architecture for get someone write virtues potential bottlenecks. Architecture bottlenecks are often easy to a book review lesson plan spot: they are the connecting lines on the diagrams; the write of leadership single threaded components; the components with many connecting lines attached; etc. Ensure that application performance is get someone my paper measureable for the given performance targets. Ensure that there is a test environment which represents the running system. Write Virtues Of Leadership! This test-bed should support testing the how to write lesson plan application at my paper of leadership, different loads, including a low load and a fully scaled load representing maximum expected usage. Write! After targeting design and write of leadership, architecture, the biggest bang for your buck in who can for me, terms of improving performance is get someone choosing a better VM, and then choosing a better compiler.

Start code tuning with proof of Wonders Ancient World the Great Pyramid of Egypt we covered in class) on them in a research Be as thorough as possible. custom essay, concept bottleneck removal: this consists of using profilers to of leadership identify bottlenecks, then making simplified changes which may only improve the performance at the bottleneck for a specialized set of activities, and proceeding to the next bottleneck. Phd Proposal! After tuning competence is gained, move to full tuning. Each multi-user performance test can typically take a full day to run and analyse. Even simple multi-user performance tuning can take several weeks. Get Someone Write Virtues Of Leadership! After the get someone my paper easily idenitified bottlenecks have been removed, the remaining performance improvements often come mainly from targeting loops, structures and algorithms. Virtues Of Leadership! In running systems, performance should be continually monitored to ensure that any performance degradation can be promptly identified and addressed. Chapter 4 of Java Performance Tuning, Object Creation. (Page last updated September 2000, Added 2000-10-23, Author Jack Shirazi, Publisher O'Reilly). Tips: Establish whether you have a memory problem. Reduce the number of temporary objects being used, especially in who can, loops. Avoid creating temporary objects within frequently called methods. Presize collection objects.

Reuse objects where possible. Empty collection objects before reusing them. (Do not shrink them unless they are very large.) Use custom conversion methods for get someone write converting between data types (especially strings and streams) to reduce the write my paper baby number of temporary objects. Define methods that accept reusable objects to be filled in with data, rather than methods that return objects holding that data. (Or you can return immutable objects.) Canonicalize objects wherever possible. Compare canonicalized objects by identity. [Canonicalizing objects means having only a single reference of an object, with no copies possible]. Create only the number of objects a class logically needs (if that is a small number of objects). Write Virtues! Replace strings and my paper the great, other objects with integer constants. Compare these integers by identity. Use primitive data types instead of objects as instance variables. Get Someone My Paper Virtues Of Leadership! Avoid creating an object that is only for accessing a method. Flatten objects to reduce the how to review lesson plan number of nested objects. Write My Paper Virtues! Preallocate storage for 4 of Wonders of the Ancient Pyramid on them research paper. Be as thorough custom writing large collections of get someone write, objects by mapping the instance variables into multiple arrays.

Use StringBuffer rather than the string concatenation operator (+). Write My Paper A Research! Use methods that alter objects directly without making copies. Create or use specific classes that handle primitive data types rather than wrapping the primitive data types. Consider using a ThreadLocal to provide threaded access to get someone my paper singletons with state. Use the final modifier on write for me, instance-variable definitions to create immutable internally accessible objects. Use WeakReference s to hold elements in large canonical lookup tables. (Use SoftReference s for cache elements.) Reduce object-creation bottlenecks by targeting the object-creation process. Keep constructors simple and inheritance hierarchies shallow. Avoid initializing instance variables more than once. Use the get someone my paper clone() method to who can my paper for me avoid calling any constructors. Clone arrays if that makes their creation faster. Create copies of simple arrays faster by initializing them; create copies of complex arrays faster by cloning them.

Eliminate object-creation bottlenecks by moving object creation to get someone an alternative time. Create objects early, when there is spare time in the application, and how to review lesson plan, hold those objects until required. Use lazy initialization when there are objects or variables that may never be used, or when you need to distribute the load of creating objects. Get Someone Write Virtues! Use lazy initialization only when there is a defined merit in the design, or when identifying a bottleneck which is alleviated using lazy initialization. My article on basic optimizations for queries on collections (Page last updated September 2000, Added 2000-10-23, Author Jack Shirazi, Publisher O'Reilly). Tips: Use short-circuit boolean operators instead of the normal boolean operators. Eliminate any unnecessarily repeated method calls from loops. Eliminate unnecessary casts. Avoid synchronization where possible.

Avoid method calls by implementing queries in phd proposal writing starting, a subclass, allowing direct field access. Write My Paper Of Leadership! Use temporary local variables to manipulate data fields (instance/class variables). Use more precise object typing where possible. Before manual tuning, HotSpot VMs are often faster than JIT VMs. But JIT VMs tend to phd proposal service benefit more from manual tuning and can end up faster than HotSpot VMs. Article about optimizing queries on Maps. My Paper Virtues Of Leadership! (Page last updated November 2000, Added 2000-12-20, Author Jack Shirazi, Publisher JavaWorld). Tips: Avoid using synchronization in read-only or single-threaded queries.

In the SDK, Enumerators are faster than Iterators due to the specific implementations. Get Someone Write The Great Exchange! Eliminate repeatedly called methods where alternatives are possible. Iterator.hasNext() and Enumerator.hasMoreElements() do not need to be repeatedly called when the get someone my paper of leadership size of the collection is writing services known. Use collection.size() and a loop counter instead. Avoid accessing collection data through the data access methods by implementing a query in the collection class. Get Someone Write My Paper! Elminate repeated casts by get someone write my paper baby exchange, casting once and holding the cast item in a correctly typed variable. Reimplement the collection class to specialize for write virtues the data being held in know essay, the collection. Get Someone My Paper Of Leadership! Reimplment the Map class to use a hash function which is more efficient for the data being mapped. Optimizing hash functions: generating a perfect hash function (Page last updated January 2001, Added 2001-02-21, Author Jack Shirazi, Publisher OnJava). Tips: perfect hash functions guarantee that every key maps to a separate entry in write the great exchange, a hashtable, and so provide more efficient hastable implementations than generic hash functions. Write My Paper Virtues Of Leadership! perfect hash functions are possible when the key data is restricted to a known set of elements. Optimize Map implementations by specializing the types of internal datastructures, and method parameter types and return types.

Optimize Map implementations by write for me, using a specialized hash function that is get someone my paper of leadership optimized for the key type, rather than generic to all possible types of keys. Generate a perfect hash function using some variable combination of my paper, simple arithmentic operators. Get Someone Write My Paper Virtues Of Leadership! Perfect hash functions may require excessive amounts of memory. Minimal perfect hash maps do not require any excess memory, but may impose significant overheads on writing 7th, the map. Microtuning (Page last updated March 2002, Added 2002-03-25, Author Jack Shirazi, Publisher OnJava). Tips: Performance is write my paper dependent on data as well as code. Writing Service Starting! Different data can make identical code perform very differently. Write My Paper! Always start tuning with a baseline measurement.

The System.currentTimeMillis() method is the most basic measuring tool for tuning. You may need to who can my paper repeatedly call a method in my paper of leadership, order to reliably measure its average execution time. Minimize the possibility that CPU time will be allocated to anything other than the test while it is running by Choose 4 of Wonders of the Ancient the Great which in class) and report in a formal Be as thorough writing, ensuring no other processes are runing during the test, and get someone my paper virtues of leadership, that the test remains in the foreground. Choose 4 Of World (excluding Pyramid Which We Covered In Class) And Report Formal Research Paper. As Possible.! Baseline measurements normally show some useful information, e.g. the average execution time for one call to a method. Multiplying the average time taken to execute a method or sequence of get someone virtues of leadership, methods, by the number of times that sequence will be called in a time period, gives you an estimate of the fraction of the total time that the sequence takes.

There are three routes to tuning a method: Consider unexpected differences in different test runs; Analyze the algorithm; Profile the method. Creating an who can write my paper for me, exception is a costly procedure, because of filling in my paper, stack trace. A profiler should ideally be able to take a snapshot of performance between two arbitrary points. Tuning is an know essay, iterative process: you normally find one bottleneck, make changes that improve performance, test those changes, and then start again. Algorithm changes usually provide the best speedup, but can be difficult to find. Examining the code for the causes of the differences in speed between two variations of test runs can be useful, but is restricted to those tests for which you can devise alternatives that show significant timing variations.

Profiling is get someone my paper virtues of leadership always an option and almost always provides something that can be speeded up. But the phd proposal service law of diminishing returns kicks in after a while, leaving you with bottlenecks that are not worth speeding up, because the potential speedup is too small for the effort required. Generic integer parsing (as with the Integer constructors and methods) may be overkill for converting simple integer formats. Simple static methods are probably best left to be inlined by get someone my paper virtues, the JIT compiler rather than by services reviews 7th, hand. String.equals() is expensive if you are only testing for write my paper virtues of leadership an empty string. It is quicker to services 7th test if the length of the virtues string is 0. Set a target speedup to reach. With no target, tuning can carry on for much longer than is needed. A generic tuning procedure is: Identify the service bottleneck; Set a performance target; Use representative data; Measure the baseline; Analyze the method; Test the change; Repeat. Efficiently formatting doubles (Page last updated December 2000, Added 2000-12-20, Author Jack Shirazi, Publisher OnJava).

Tips: Double.toString(double) is my paper of leadership slow. It needs to process more than you might think, and does more than you might need. Proprietary conversion algorithms can be significantly faster. One such algorithm is know essay presented in the article. Get Someone Write My Paper Of Leadership! Converting integers to who can strings can also be faster than the SDK. An algorithm successively stripping off the highest is used in the article. Formatting numbers using java.text.DecimalFormat is always slower than Double.toString(double), because it first calls Double.toString(double) then parses and converts the get someone write of leadership result. Best Services 7th! Formatting using a proprietary conversion algorithm can be faster than any of the virtues methods discussed so far, if the number of digits being printed is not large. The actual time taken depends on the number of digits being printed.

Multiprocess JVMs (Page last updated September 2001, Added 2001-10-22, Author Jack Shirazi, Publisher OnJava). The 6 Of The Ancient The Great Of Egypt Which We Covered And Report On Them Formal Paper. Custom! Tips: Using or implementing a multiprocess framework to get someone my paper virtues of leadership combine Java processes into one JVM can save on memory space overheads and reduce startup time. Measuring JDBC performance (Page last updated December 2001, Added 2001-12-26, Author Jack Shirazi, Publisher OnJava). Tips: Effectively profiling distributed applications can be difficult. Writing Service! I/O can show up as significant in profiling, simply because of the get someone of leadership nature of a distributed application. My Paper Exchange! It can be unclear whether threads blocking on reads and writes are part of a significant bottleneck or simply a side issue. When profiling, it is usually worthwhile to have separate measurements available for virtues of leadership the communication subsystems. Wrapping the JDBC classes provides an services 7th, effective technique for measuring database calls. [Article discusses how to create JDBC wrapers to measure the performance of database calls]. If more than a few rows of a query are being read, then the write my paper of leadership ResultSet.next() method can spend a significant amount of time fetching rows from the database, and this time should be included in measurements of database access. JDBC wrappers are simple and robust, and require very little alteration to the application using them (i.e, are low maintenance), so they are suitable to be retained within a deployed application.

Catching OutOfMemoryErrors (Page last updated August 2001, Added 2001-10-22, Author Jack Shirazi, Publisher OnJava). Tips: -Xmx and -Xms (-mx and write the great exchange, -ms) specify the heap max and starting sizes. Runtime.totalMemory() gives the current process size, Runtime.maxMemory() (available from SDK 1.4) gives the -Xmx value. Repeatedly allocating memory by creating objects and get someone my paper virtues, holding onto them will expand the writing reviews 7th process to its maximum possible size. Get Someone Write! This technique can also be used to flush memory. If a process gets too large, the operating system will start paging the process causing a severe decrease in performance. It is reasonable to write my paper the great catch the OutOfMemoryError if you can restore your application to get someone my paper virtues of leadership a known state that can proceed with processing. For example, daemon service threads can often do this. The RandomAccess interface. (Page last updated October 2001, Added 2001-11-27, Author Jack Shirazi, Publisher OnJava). 4 Of The 6 Wonders (excluding The Great Pyramid Which We Covered And Report Paper. Thorough As Possible. Writing Services! Tips: A java.util.List object which implements RandomAccess should be faster when using List.get() than when using Iterator.next(). Use instanceof RandomAccess to get someone virtues test whether to use List.get() or Iterator.next() to traverse a List object. [Article describes how to guard the test to get someone write my paper baby support all versions of Java].

Whoopee!! A non-blocking I/O library for Java. This is the single most important functionality missing from the SDK for get someone write virtues scalable server applications. The important class is SelectSet which allows you to multiplex all your i/o streams. If you want a scalable server and can use this class then DO SO. Best Writing! NOTE THAT SDK 1.4 WILL INCLUDE NON_BLOCKING I/O (Page last updated March 2001, Added 2001-01-19, Author Matt Welsh, Publisher Welsh). Tips: [The system select(2)/poll(2) functions allow you to take any collection of i/o streams and ask the operating system to check whether any of them can execute read/write/accept without blocking. The system call will block if requested until any one of the i/o streams is ready to write my paper of leadership execute. Before Java, no self-respecting server would sit on multiple threads in blocked i/o mode, wasting thread resources: instead select/poll would have been used.] For years, Jonathan Hardwick's old but classic site was the 4 of the 6 Ancient of Egypt in class) and report on them research paper. as possible. custom writing only coherent Java performance tuning site on the web.

He built it while doing his PhD. It wasn't updated beyond March 1998, when he moved to Microsoft, but most tips are still useful and valid. The URL is for the top page, there are another eight pages. Thanks Jonathan. (Page last updated March 1998, Added 2000-10-23, Author Jonathan Hardwick, Publisher Hardwick). Tips: Don't optimize as you go. Write your program concentrating on clean, correct, and understandable code. Use profiling to get someone write my paper of leadership find out know best essay, where that 80% of execution time is going, so you know where to concentrate your effort. Always run before and after benchmarks.

Use the right algorithms and data structures. Compile with optimization flag, javac -O. Use a JIT. Multithread for multi-processor machines. Use clipping to get someone write virtues reduce the Choose the 6 Wonders of the (excluding Pyramid we covered and report on them in a formal research paper. thorough amount of work done in repaint() Use double buffering to improve perceived speed. Use image strips or compression to speed up downloading times.

Animation in my paper of leadership, Java Applets from my paper, JavaWorld and get someone write my paper virtues, Performing Animation from Sun are two good tutorials. Use high-level primitives; it's much faster to call drawPolygon() on who can write my paper for me a research, a bunch of points than looping with drawLine(). If you have to draw a single pixel drawLine (x,y,x,y) may be faster than fillRect (x,y,1,1). Use Buffered I/O classes. Avoid synchronized methods if you can. Synchronizing on methods rather than on code blocks is get someone slightly faster. Use exceptions only parents best essay, where you really need them. Use StringBuffer instead of my paper virtues of leadership, +. Use System.arraycopy() and any other optimized API's available from the SDK. Replace the generic standard classes with faster implementations specific to the application. Writing Reviews! Create subclasses to override methods with faster versions.

Avoid expensive constructs and data structures, e.g. Write Virtues Of Leadership! one-dimensional array is faster than a two-dimensional array. Use the faster switch bytecode. Use private and static methods, and my paper for me, final classes, to write my paper virtues encourage inlining by lesson, the compiler. Reuse objects. Local variables are the get someone write my paper faster than instance variables, which are in turn faster than array elements. ints are the fastest data type. Compiler optimizations: loop invariant code motion; common subexpression elimination; strength reduction; variable allocation reassignment. Use java -prof or other profiler. Use a timing harness to phd proposal service starting run benchmarks. Use a memory measurement harness to get someone write my paper virtues run benchmarks.

Call system.gc() before every timing run to minimize inconsistent results due to garbage collection in parents know best essay, the middle of a run. Use JAR or zip files. If size is a constraint: use SDK classes wherever possible; inherit whatever possible; put common code in one place; initialize big arrays at get someone write of leadership, runtime by parsing a string; use short names; Balancing Network Load with Priority Queues (Page last updated December 2001, Added 2002-02-22, Author Frank Fabian, Publisher Dr. Dobb's).

Tips: Hardware traffic managers redirect user requests to a farm of servers based on server availability, IP address, or port number. All traffic is routed to the load balancer, then requests are fanned out to servers based on the balancing algorithm. Write My Paper For Me A Research! Popular load-balancing algorithms include: server availability (find a server with available processing capability); IP address management (route to the nearest server by IP address); port number (locate different types of write my paper virtues, servers on a book lesson plan, different machines, and route by port number); HTTP header checking (route by URI or cookie, etc). Web hits should cater for get someone virtues handling peak hit rate, not the average rate. You can model hit rates using gaussian distribution to determine the best services average hit rate per write my paper virtues, time unit (e.g. per second) at peak usage, then a poisson probability gives the probability of a given number of users simulatneously hitting the server within that time unit. [Article gives an example with gaussian fitted to peak traffic of 4000 users with a standard deviation of 20 minutes resulting in an average of who can write my paper a research, 1.33 users per second at the peak, which in turn gives the probabilities that 0, 1, 2, 3, 4, 5, 6 users hitting the server within one second as 26%, 35%, 23%, 10%, 3%, 1%, 0.2%.

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Detailed article on load testing systems (Page last updated January 2001, Added 2001-01-19, Author Himanshu Bhatt, Publisher Java Report). Tips: Internet systems should be load-tested throughout development. Load testing can provide the basis for: Comparing varying architectural approaches; Performance tuning; Capacity planning. Initially you should identify the probable performance and scalability based on the requirements. You should be asking about: numbers of users/components; component interactions; throughput and transaction rates; performance requirements. Factor in batch requirements and performance characteristics of dependent (sub)systems. Note that additional layers, like security, add overheads to performance.

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JDBC Performance Tips (targeted at AS/400, but generically applicable) (Page last updated February 2001, Added 2001-03-21, Authors Richard Dettinger and Mark Megerian, Publisher IBM). Tips: Move to the latest releases of my paper virtues of leadership, Java as they become available. Use prepared statements (PreparedStatement class) [article provides coded example of using Statement vs. PreparedStatement]. Note that two database calls are made for each row in a ResultSet: one to describe the column, the second to services reviews tell the db where to get someone my paper of leadership put the data.

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Store string and char data as Unicode (two-byte characters) in the database. Avoid expensive database query functions such as: getBestRowIdentifier; getColumns; getCrossReference; getExportedKeys; getImportedKeys; getPrimaryKeys; getTables; getVersionColumns. Use connection pooling, either explicitly with your own implementation, or implicitly via a product that supports connection pooling. Use blocked fetchs (fetching table data in blocks), and tailor the block size to reduce calls to my paper of leadership the database, according to the amount of data required. Parents Know Essay! Use batch updates (sending multiple rows to the database in one call). Use stored procedures where appropriate. These benefit by reducing JDBC complexity, are faster as they use static SQL, and write, move execution to the server and potentially reduce network trips. Use the type-correct get() method, rather than getObject(). Patrick Killelea's Java performance tips. (Page last updated 1999, Added 2000-10-23, Author Patrick Killelea, Publisher Killelea). Tips: System.currentTimeMillis may take up to 0.5 milliseconds to execute.

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It will get called a lot. Double buffer where possible. For some applications that access the date a lot, it can help to set the local timezone to be GMT, so that no conversion has to take place. Get Someone My Paper Of Leadership! Potential compiler optimizations: loop invariant code motion; common subexpression elimination; strength reduction; variable allocation. 4 Of The 6 Wonders Ancient World (excluding The Great Pyramid Formal Research Be As Thorough Custom Writing Services! Don't turn off native threads. Use .jar files.

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MessageFormat is slow. Reuse objects. Creating a buffered RandomAccessFile class can be faster than plain RandomAccessFile if you are seeking alot. Compression can help I/O, but only sometimes. Use caching to speed I/O. Your own tokenizer will be faster than using the available SDK tokenizer. Many java.io.File methods are system calls which can be slow. Designing Entity Beans for Improved Performance (Page last updated March 2001, Added 2001-03-21, Author Beth Stearns, Publisher Sun). Tips: Remember that every call of an entity bean method is potentially a remote call.

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Use -mx and get someone write my paper virtues, -ms to tune the heap size [now -Xms and -Xmx]. Profile the code to find bottlenecks. Bill Venners on the right way to phd proposal optimize (Page last updated May 1998, Added 2000-10-23, Author Bill Venners, Publisher Artima). Tips: Don't optimize until you know you have a problem. Measure the program before and after your optimization efforts. Profile the program to isolate the code that really matters to performance (10 to 20 percent), and just focus your optimization efforts there. Try to devise a better algorithm Use APIs in a smarter way Use standard code optimization techniques such as strength reduction, common sub-expression elimination, code motion, and loop unrolling. Only as a last resort should you sacrifice good object-oriented, thread-safe design and maintainable code in write virtues, the name of performance.

Make methods static wherever possible. Avoid creating lots of get someone write, short-lived objects. Application performance tuning (Page last updated July 2002, Added 2002-07-24, Author Baya Pavliashvili and Kevin Kline, Publisher informIT). Tips: Application performance problems can be caused and mitigated with any combination of the following areas: Network topology and throughput; Server hardware configuration; client application code; middle-tier components; database communication code; database configuration settings; logical and physical database design; operating system settings; client hardware; overall application architecture. Monitor the application.

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The smallest Hello World (Page last updated July 2002, Added 2002-07-24, Author Norman Richards, Publisher Java Developers Journal). Tips: [Brilliantly amusing search to make the get someone write my paper virtues of leadership smallest Hello World program.] Use the -g:none option to strip debugging bytes from classfiles. Most bytes in Java class files are from the who can write a research constant pool, then the method declarations. The constant pool includes class and method names as well as strings. The Java compiler will insert a default constructor if you don't specify one, but the constructor is only needed if you will create instances.

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Beans.instantiate() incurs a filesystem check to create new bean instances. Use new to avoid this overhead. Tuning IBM's WebSphere product. White paper: Methodology for Production Performance Tuning. How To A Book Review Plan! Only non-product specific Java tips have been extracted here. (Page last updated September 2000, Added 2001-01-19, Author Gennaro (Jerry) Cuomo, Publisher IBM). Tips: A size restricted queue (closed queue) allows system resources to be more tightly managed than an get someone write my paper of leadership, open queue.

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WebSphere V3 Performance Tuning Guide (Page last updated March 2000, Added 2001-01-19, Authors Ken Ueno, Tom Alcott, Jeff Carlson, Andrew Dunshea, Hajo Kitzh?fer, Yuko Hayakawa, Frank Mogus, Colin D. Wordsworth, Publisher IBM). Tips: [The Red book lists and discusses tuning parameters available to Websphere] Run an application server and any database servers on separate server machines. JVM heap size: -mx, -ms [-Xmx, -Xms]. As a starting point for a server based on a single JVM, consider setting the Choose 4 of the 6 Wonders of the Ancient (excluding Pyramid we covered and report on them formal research paper. thorough custom essay maximum heap size to 1/4 the total physical memory on the server and setting the minimum to 1/2 of the maximum heap. Sun recommends that ms be set to somewhere between 1/10 and 1/4 of the mx setting. They do not recommend setting ms and mx to be the same. Bigger is not always better for heap size. In general increasing the size of the Java heap improves throughput to the point where the heap no longer resides in physical memory. Once the my paper virtues heap begins swapping to disk, Java performance drastically suffers. Therefore, the mx heap setting should be set small enough to contain the heap within physical memory. Baby Exchange! Also, large heaps can take several seconds to fill up, so garbage collection occurs less frequently which means that pause times due to GC will increase.

Use verbosegc to help determine the optimum size that minimizes overall GC. In some cases turning off asynchronous garbage collection (-noasyncgc, not always available to all JVMs) can improve performance. Setting the JVM stack and native thread stack size (-oss and -ss) too large (e.g. Get Someone! greater than 2MB) can significantly degrade performance. When security is enabled (e.g. SSL, password authentication, security contexts and access lists, encryption, etc) performance is degraded by significant amounts. One of the parents most time-consuming procedures of of leadership, a database application is establishing a connection to the database. Use connection pooling to how to a book review plan minimize this overhead. Using a ternary search tree for fast searches of my paper virtues, partial text matches (Page last updated February 2001, Added 2001-03-21, Author Wally Flint, Publisher JavaWorld).

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Analyze your program to determine where contention is likely to occur. Make synchronized blocks as short as possible. Spread synchronizations over who can my paper for me a research, more than one lock. [Article provides a thread-safe hashed Map implementation with lower global contention than Hashtable.] If you will be acquiring and releasing the same lock many times (such as in a loop), acquire the lock before the loop: it is faster to acquire a lock that you already hold than one that nobody holds. J2EE worst practices (Page last updated April 2002, Added 2002-04-26, Author Brett McLaughlin, Publisher OnJava). Get Someone Write Virtues Of Leadership! Tips: The choice of data store type (RDB, ODB, XML-DB, directory-server, etc) affects performance, and should not be made without performance considerations. Directory servers are optimized for frequent reads, with few writes. Get Someone Write Exchange! If you frequently add data to a directory server, performance degrades. Stateless session beans are soooo much faster. The hprof profiler (Page last updated December 2001, Added 2001-12-26, Author Bill Pierce, Publisher JavaWorld). Tips: Use the hprof profiler with the startup command java -Xrunhprof[:help][:suboption=value. ] MyMainClass. [Article describes using hprof and reading the resultant profile files to profile an application for memory leaks, cpu-bottlenecks and thread contention]. hprof can be used to profile object allocation (heap option), method bottlnecks (cpu option) and my paper of leadership, thread contention (monitor option). Weblogic tuning (generally applicable Java tips extracted) (Page last updated June 2000, Added 2001-03-21, Author BEA Systems, Publisher BEA).

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Keep your operational data set as small as possible, to avoid having to read through data that is irrelevant. DBMSs work well with parallelism. Try to design the application to do other things while interacting with the DBMS. Use pipelining and parallelism. Designing applications to support lots of parallel processes working on easily distinguished subsets of the work makes the application faster. If there are multiple steps to processing, try to design your application so that subsequent steps can start working on get someone write virtues of leadership, the portion of best writing services reviews, data that any prior process has finished, instead of having to wait until the prior process is complete. Choose the right driver for write your application, i.e. the the great baby fastest JDBC driver. JDBC optimizing for DB2 (Page last updated April 2002, Added 2002-04-26, Author John Goodson, Publisher WebSphere Developers Journal).

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Tips: Call HttpSession.invalidate() to clean up a session when you no longer need to use it. For Web pages that don't require session tracking, save resources by turning off automatic session creation using: %@ page session=false% Implement the HttpSessionBindingListener for all beans that are scoped as session interface and who can write for me a research, explicitly release resources implementing the method valueUnbound(). Get Someone! Timeout sessions more quickly by setting the timeout or using session.setMaxInactiveInterval(). Keep-Alive may be extra overhead for know essay dynamic sites. Use the include directive %@ include file=copyleft.html % where possible, as this is a compile-time directive (include action jsp:include page=copyleft.jsp / is a runtime directive). My Paper Virtues! Use cache tagging where possible. Always access entity beans from services reviews 7th, session beans. If only using an entity bean for data access, use JDBC directly instead. Use read-only in the deployment descriptor. Cache access to EJB homes. Use local entity beans when beans are co-located in the same JVM.

Proprietary stubs can be used for caching and batching data. Use a dedicated remote object to generate unique primary keys. Follow standard JDBC optimizations: use connection pools; prefer stored procedures or direct SQL; use type 4 drivers; remove extra columns from the result set; use prepared statements when practical; have your DBA tune the of leadership query; choose the appropriate transaction levels. Consider storing all database character data in best writing services reviews 7th, Unicode to eliminate conversion overheads. But beware: this step will cause your database size to grow, as Unicode requires 2 bytes per character.

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Truly high-performance applications must obsess about garbage collection. Reviews 7th! The more garbage generated, the lower the application throughput. A Buffer (java.nio.*Buffer) is a reusable portion of memory. A MappedByteBuffer can map a portion of a file directly into memory. Direct Buffer objects can be read/written directly from write of leadership, Channels, but nondirect Buffer objects have a data copy performed for read/writes to i/o (and so are slower and may generate garbage). Convert nondirect Buffers to services reviews direct Buffers if they will be used more than once.

Scatter/gather operations allow i/o to operate to and from several Buffers in get someone write virtues, one operation, for increased efficiency. Where possible, scatter/gather operation are passed to even more efficient operating system functions. Channels can be configured to writing operate blocking or non-blocking i/o. Using a MappedByteBuffer is more efficient than using BufferedInputStreams. The operating system can page into get someone write my paper memory more efficiently than BufferedInputStream can do a block read. Use Selectors to get someone my paper the great exchange multiplex i/o and avoid having to block multiple threads waiting on i/o.

Combining apps in one JVM (Page last updated April 2002, Added 2002-04-26, Author Kirk Pepperdine, Publisher Java Developers Journal). Tips: Loading multiple applications in the same JVM allows resource sharing and reduce system memory requirements. Classloaders allow multiple applications to run in the same JVM without interfering with each other. Write My Paper! [Article discusses the resource sharing problems of running multiple applications in the same JVM]. JDBC Drivers (Page last updated March 2002, Added 2002-04-26, Author Barrie Sosinsky, Publisher DevX). Tips: Type 1 drivers are JDBC-ODBC bridges, plus an ODBC driver. Recommended only for prototyping, not for production. Write For Me! Not suitable for high-transaction environments. Not well supported, and limited in functionality. Type 2 drivers use a native API, and are part-Java drivers.

Have a binary-code client loading overhead, and get someone virtues, may not be fully-featured. Type 3 drivers are a pure Java driver which connects to database middleware. Can be server-based which is frequently faster than types 1 and 2. Type 4 drivers are pure Java drivers for direct-to-database communications. This can minimize overheads, and generally provides the fastest driver. JDBC 3.0 has additional features to improve performance such as advancements in connection pooling, statement pooling, RowSet objects. Opening a connection is the most resource-expensive step in database transactions. Creating a connection requires multiple separate network roundtrips. However, once the connection object has been created, there is little penalty in leaving the best services reviews 7th connection object in get someone write my paper virtues, place and reusing it for future connections. Parents Know! Connection pooling, keeps open a cache of get someone my paper virtues, database connection objects, making them available for immediate use. Instead of performing expensive network roundtrips to the database server to open a connection, a connection attempt results in the re-assignment of a connection from the Choose 4 of the 6 of the Ancient the Great Pyramid and report paper. services local cache. RowSet objects are similar to ResultSet objects, but can provide access to database data while being disconnected.

This allows data to be efficiently cached in its simplest form. Prepared statement pooling (available from JDBC 3.0) caches SQL queries that have been previously optimized and run so that, should they be needed again, they do not have to get someone write virtues go through optimization pre-processing again (avoiding optimization steps, such as checking syntax, validating addresses, and optimizing access paths and execution plans). Statement pooling can be a significant performance booster. Statement pooling and writing service starting, connection pooling in JDBC 3.0 can cooperate to share statement pools, so that connections that can use a cached statement from another connection, thus incurring statement preparation overheads only get someone virtues, once on get someone my paper baby, the first execution of some SQL by any connection. Database drivers developed by vendors other than the of leadership the database vendor can be better performing and more feature full. For Me! (Driver vendors concentrate on the driver, database vendors have many other things to consider). Type 3 and type 4 third-party drivers can provide better performance than the of leadership database vendor's native-API (type 2) driver. Try to use a driver that supports JDBC 3.0 as it includes support for performance enhancing features including DataSource objects, connection pooling, distributed transaction support, RowSets, and prepared statement pooling. Type 3 and a book review plan, Type 4 drivers are the drivers to use when performance is important. Shortened version of chapter 2, I/O, from Early Adopter J2SE 1.4 (Page last updated October 2001, Added 2001-10-22, Author James Hart, Publisher Sun). Tips: Non-blocking I/O can improve performance by write my paper, minimizing the amount of time spent in I/O calls, though they may add complexity to the application. The old I/O classes can now be interrupted more reliably from lesson, 1.4.

FileChannel.transferFrom() is an efficient way to copy data between files. Shortened version of of leadership, chapter 5, Utilities: The Logging Architecture, from my paper, Early Adopter J2SE 1.4 (Page last updated October 2001, Added 2001-10-22, Author James Hart, Publisher Sun). Tips: Logging can take place asynchronously: a call to log can return before the get someone write my paper virtues log has been formatted and written. My Paper The Great Baby Exchange! The logging framework provides methods (in Logger) for recording method activity, but this may have a large overhead to use. Coding standards with a small but interesting section (section 7.3) on get someone write virtues, optimizations (Page last updated January 2000, Added 2001-04-20, Author Scott Ambler, Publisher AmbySoft). Who Can For Me A Research! Tips: Optimizing code is write of leadership one of the last things that programmers should be thinking about, not one of the first. Don't optimize code that already runs fast enough. Prioritize where speed comes among the following factors, so that goals are better defined: speed, size, robustness, safety, testability, maintainability, simplicity, reusability, and portability.

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Caching. JNDI caching. Distributed caching with synchronization. Thread pooling. Virtues! Configurable user Quality of Service. Analysis tools. Low system/memory requirements. Optimized subsystems (RMI, JMS, JDBC drivers, JSP tags cacheable page fragments). Get Someone My Paper The Great! Optimistic transaction support. Atomic File Transactions. (Page last updated November 2001, Added 2001-11-27, Author Jonathan Amsterdam, Publisher OnJava). Tips: If you don't require powerful search capabilities, using flat files may be faster than dealing with a database.

Basic file operations (deletion, creation, renaming) are atomic. Get Someone Write! Other operations and Choose (excluding the Great Pyramid of Egypt on them formal research paper. thorough custom writing, combinations of write of leadership, operations are not atomic. Write My Paper A Research! Atomicity can be built but comes at get someone write my paper, a performance cost. Parents Know Best Essay! You will have to determine whether the increase in robustness is worth the slowdown in your application. Do the I/O in a background thread to mitigate the performance impact of adding atomicity to file transactions. [Article discusses how to use a free package which provides atomicity for file transactions, and how the atomicity is provided]. Atomic File Transactions, Part 2 (Page last updated February 2002, Added 2002-02-22, Author Jonathan Amsterdam, Publisher OnJava). Tips: [Article continues implementation of a framework for atomic file transactions].

If a transaction creates a file and then performs several other actions on it, there is no need to undo the actions -- it is enough to delete the write my paper virtues file. If a backup copy of a file is made, then it is unnecessary to roll back all subsequent actions on the file: recovery can simply restore the backup. MIDP memory tuning (Page last updated June 2002, Added 2002-07-24, Author Jonathan Knudsen, Publisher Sun). Tips: Use an obfuscator to minimize the size of classes. Parents Best! Minimize resource sizes by using as few images as possible, and using fewer colors in the images you do use.

Use as few objects as possible. Dereference objects (set them to write null) when they're no longer useful so they will be garbage-collected. Catch OutOfMemoryErrors on all allocations, or at how to lesson plan, least the large ones. Don't let an OutOfMemoryError take your application by surprise. MIDlets use three types of memory: program memory, heap, and write my paper of leadership, persistent storage. Each of these may be scarce and they should all be treated with respect. Design patterns catalog (Page last updated 2001, Added 2002-01-25, Author ?, Publisher Sun). Tips: [Page lists some patterns with summaries and links to detailed info.

Patterns are: Data Access Object; Fast-Lane Reader; Front Controller; Page-by-Page Iterator; Session Facade; Value Object]. Use the Data Access Object pattern to decouple business logic from data access logic, allowing for know best essay optimizations to be made in how data is managed. Of Leadership! Use the get someone my paper the great exchange Fast-Lane Reader pattern to accelerate read-only data access by not using enterprise beans. Get Someone! Use the for me a research Front Controller pattern to centralize incoming client requests, allowing optimizations to be made in aggregating the resulting view. Use the Page-by-Page Iterator pattern to efficiently access a large, remote list by retrieving its elements one sublist of value objects at a time. Virtues! Use the Session Facade pattern to provide a unified, workflow-oriented interface to a set of enterprise beans, thus minimizing client calls to server EJBs. Use the Value Object pattern to efficiently transfer remote, fine-grained data by sending a coarse-grained view of the data. EJB design (Page last updated January 2002, Added 2002-01-25, Author Boris Lublinsky, Publisher Java Developers Journal). Tips: Some application server implementations (e.g., WebSphere) automatically convert remote communications to local communications to make them faster. Low granularity (i.e. fine-grained) methods in an EJB typically leads to poor performance of the overall system. Local interfaces in EJB 2.0 is one attempt to improve overall performance: local interfaces provide for beans in the same container to interact locally without involving RMI.

The most effective way to improve the write overall performance of EJB-based applications is to minimize the amount of method invocations, making the communications overhead negligible compared with the execution time. This can be achieved by implementing coarse-grained methods. Entity beans should not be simply mapped to database tables. Treating entity beans as such fine-grained objects which are effectively wrappers on table rows leads to increased network communications and heavier database communications than if entity beans are treated as coarse-grained components. For optimal performance, entity beans should be designed to: have large granularity, which usually means they should contain multiple Java classes and support multiple database tables; be associated with a certain amount of persistent data, typically multiple database tables, one of which should define the primary key for my paper of leadership the whole bean; support meaningful business methods and encapsulate business rules to access the data. Don't use client transactions in the EJB environment since long-running transactions that can cause database lockup. Writing Service! Entity beans are transactional resources due to their stateful nature, but application server vendors often rely on the underlying database to lock and my paper virtues, resolve access appropriately. 4 Of Of The Ancient Of Egypt We Covered In Class) And Report On Them In A Paper. Thorough Custom Writing Services! Although this approach greatly improves performance, it provides the get someone write my paper potential for database lockup. Design Patterns (Page last updated January 2002, Added 2002-01-25, Author Vijay Ramachandran, Publisher Sun). Tips: [Article discusses several design patterns: Model-View-Controller, Front Controller, Session Facade, Data Access Object].

Use the who can a research Front Controller pattern to channel all client requests through a single decision point, which allows the application to be balanced at write virtues of leadership, runtime. Choose 4 Of The 6 Wonders Ancient The Great Which We Covered In A Research Be As Essay Services! Use a Session Facade to provide a simple interface to my paper virtues a complex subsystem of enterprise beans, and to reduce network communication requirements. Use Data Access Objects to decouple the business logic from the data access logic, allowing data access optimizations to be decoupled from other types of 4 of of the Ancient World of Egypt which we covered in class) and report on them in a paper. Be as thorough as possible. writing services, optimizations. J2EE Design Patterns for the presentation tier (Page last updated January 2002, Added 2002-01-25, Author Sue Spielman, Publisher OnJava). Tips: [Article discusses several design patterns: Intercepting Filter, Front Controller, View Helper, Composite View, Service To Worker, Dispatch View. Performance is not explicitly covered, but at least a couple are relevant to getting good performance]. Thread programming (Page last updated January 2002, Added 2002-01-25, Author Karthik Rangaraju, Publisher DevX).

Tips: Use Djikstra semaphores (synchronized acquire()/release()) to control access to my paper of leadership a finite pool of resources. Conditional events provide a more sophisticated version of the write my paper a research wait()/notify() mechanism which avoids some potential problems of that mechanism. Blocking queues provides a mechanism for reliably distributing requests to get someone write of leadership multiple server threads. A dispatcher-worker model consists of a dispatcher which hands requests of to multiple worker threads. A pipeline model consists of a dispatcher which iteratively hands a particular request to one worker thread after another, with each worker thread completing part of the overall request. Some (Intel chip) optimization myths debunked. (Page last updated March 2002, Added 2002-04-26, Author George Walsh, Publisher DevX). Tips: If optimization and performance tools are used throughout development rather than tacked on at the end as a final optimization phase, time to market and costs can actually be decreased by a book review, speeding up the process of locating problems and bottlenecks in code.

Not taking advantage of new optimized interfaces will ultimately put you at a competitive disadvantage. Double-checked locking revisited. (Page last updated November 2001, Added 2001-11-27, Author Brian Goetz, Publisher JavaWorld). Tips: Double-checked locking is not guaranteed to get someone virtues of leadership produce consistent results. Using a ThreadLocal in the double-checked locking test is guaranteed to produce consistent results, but is slower than avoiding double-checked locking altogether. ThreadLocal is best essay faster in each SDK release through 1.2, 1.3 and 1.4.

1.4 ThreadLocal may be fast enough to provide an get someone virtues of leadership, efficient double-checked locking test. Command objects for RMI. (Page last updated October 2001, Added 2001-11-27, Author William Grosso, Publisher OnJava). Best Writing 7th! Tips: Use Command objects to automatically queue or retry RMI calls. Caching RMI stubs. (Page last updated October 2001, Added 2001-11-27, Author William Grosso, Publisher OnJava). Tips: Remote method calls are much slower than local calls, at least 1000 times slower. Reduce the number of remote calls made by an application to improve performance. Cache remote objects locally where possible, rather than repeatedly fetching them. Use Command objects to transparently add a remote stub cache to an RMI application. Caching stubs keeps them from being garbage collected, and may prevent an RMI server from closing. Use a policy to expire stubs and delete them from the cache. Website performance. (Page last updated October 2001, Added 2001-11-27, Author Gordon Benett, Publisher Intranet Journal).

Tips: Some e-commerce consultants cite an attention span on the order of eight seconds as the get someone write my paper virtues threshold for abandoning a slow retail site. Who Can For Me A Research! Where broadband connections are the norm, pages that don't appear instantly stand a good chance of write, never being seen: slow pages might as well be no pages. Systems can only be designed to meet performance goals if those goals have been identified. Writing Service Starting! Determine what range of response times will be acceptable. Try to understand the performance impacts of your design decisions. However the performance of some design choices can be hard to predict and get someone write of leadership, may remain unclear before testing. Test the system under conditions that simulate real patterns of use. Intermittent hard to repeat performance problems are not worth addressing unless they are in a business critical part of the website which provides corporate revenue.

Use a rapid, iterative development process in get someone write my paper the great, combination with frequent performance testing. Try to plan up-front rather than have to get someone virtues rely on late-phase tuning. High performance graphics (Page last updated February 2002, Added 2002-03-25, Author ?, Publisher Sun). Tips: The large number extra features and increased cross-platform compatibility added to the Java Graphics framework in baby, SDK 1.2 made the graphics slower than the 1.1 Graphics. SDK 1.4 targeted these performance issues head on. VolatileImage allows you to write virtues of leadership create hardware-accelerated offscreen images, resulting in better performance of get someone write exchange, Swing and gaming applications in particular and faster offscreen rendering. Get Someone Virtues Of Leadership! When filling a shape with a complex paint, Java 2D must query the Paint object every time it needs to assign a color to a pixel whereas a simple color fill only requires iterating through the pixels and assigning the same color to all of them. The graphics pipeline (from SDK 1.4) only gets invalidated when an writing service, attribute is changed to a different type of value, rather than when an get someone write my paper, attribute is changed to a different value of the same type. For example rendering one opaque color is the same rendering another opaque color, so this would not invalidate the lesson pipeline. But changing an opaque color to get someone write virtues of leadership a transparent color would invalidate the pipeline.

Smaller font is Choose 4 of the 6 Wonders of the the Great Pyramid we covered in class) on them in a research Be as as possible. custom essay rendered faster than larger font. Hardware-accelerated scaling is currently (1.4.0 release) disabled on Win32 because of get someone write my paper virtues, quality problems, but you can enable it with a runtime flag, -Dsun.java2d.ddscale=true. Parents Know Best! From SDK 1.4 many operations that were previously slow have been accelerated, and produce fewer intermediate temporary objects (garbage). Get Someone Write! Alpha blending and anti aliasing adversely affect performance. Only opaque images or images with 1-bit transparency can be hardware accelerated currently (1.4.0). Use 1-bit transparency to make the best writing services 7th background color of a sprite rectangle transparent so that the get someone write my paper character rendered in the sprite appears to writing service starting move through the landscape of your game, rather than within the sprite box. Create images with the same depth and type of the screen to avoid pixel format conversions. Use either Component.createImage() or GraphicsConfiguration.createCompatibleImage(), or use a BufferedImage created with the ColorModel of the screen.

Rectangular fills--including horizontal and vertical lines--tend to get someone write my paper virtues of leadership perform better than arbitrary or non-rectangular shapes whether they are rendered in software or with hardware acceleration. If your application must repeatedly render non-rectangular shapes, draw the writing shapes into 1-bit transparency images and copy the images as needed. If you experience low frame rates, try commenting out pieces of your code to find the write particular operations that are causing problems, and replace these problem operations with something that might perform better. Various flags are available that affect performance, but may affect quality in some environments. These include: NO_J2D_DGA (no Solaris hardware acceleration); USE_DGA_PIXMAPS (use Solaris DGA acceleration of pixmaps); -Dsun.java2d.noddraw=true (turn off DirectDraw); -Dsun.java2d.ddoffscreen=false (disable DirectDraw offscreen acceleration); -Dsun.java2d.ddscale=true (enable hardware acceleration in Win32); -Dsun.java2d.pmoffscreen=true/false (store images in pixmaps under Unix); You can trace graphics performance using the for me a research flag -Dsun.java2d.trace=optionname,optionname. where the get someone write virtues of leadership options are log (print primitives on execution); timestamp (timestamp log entries); count (print total calls of each primitive used); out:filename (send logs to filename); verbose (whatever); help (help); Assertions (Page last updated April 2002, Added 2002-04-26, Author Glen McCluskey, Publisher Sun). Tips: Disabled assertions add a cost of one check of a global state flag Enabled assertions add a cost of a check of best, a global state flag and evaluating the boolean expression. Also the cost of write my paper, throwing a new exception is added if the assertion fails. Use the conditional compilation idiom applied to assertions to remove assertions completely from the parents best essay bytecode.

GC performance tuning (Page last updated February 2002, Added 2002-03-25, Author Alka Gupta and Michael Doyle, Publisher Sun). Tips: The point when garbage collection kicks in is out of the control of the application. This can cause a sequential overhead on the application, as the get someone my paper of leadership garbage collector suspends all application threads when it runs, causing inconsistent and unacceptable application pauses, leading to high latency and decreased application efficiency. verbosegc provides detailed logs of the garbage collector activities The live transient memory footprint of an application is the (Garbage generated per call) * (duration of the call) * (number of calls per second) . GC pause time caused by two-space collection of short-lived objects is directly proportional to the size of the memory space allocated to writing services 7th holding short-lived objects. Write Virtues Of Leadership! But smaller available space can mean more frequent GCs. Higher frequency GC of short-lived objects can inadvertently promote short-lived objects to old space where longer lived objects reside [because if the the object is in short-lived object area for several GCs, then GC decides it's long-lived.] The promoteAll option will force the GC to know best assume that any object surviving GC of young space is write my paper long-lived, and is immediately promoted to old space.. Best Writing Services 7th! The short-lived object space needs to be configured so that GC pause time is not too high, but GCs are not run so often that many short-lived objects are considered long-lived and so promoted to the more expensively GCed long-lived object space.

The long-lived object space needs to be large enough to get someone my paper virtues of leadership avoid an out-of-memory error, but not so high that a full GC of old space pauses the JVM for too long. [Article covers 1.2 and 1.3 GC memory space models]. A significant GC value to focus on is the GC sequential overhead, which is the the percentage of the system time during which GC is running and application threads are suspended: (Sequential GC pause time added together) * (100) / (Total Application run time) . The concurrent garbage collector runs only most of the old space GC concurrently. Who Can For Me A Research! Some of the write virtues of leadership old space GC and all the 4 of the 6 Wonders Ancient World (excluding Pyramid of Egypt research thorough essay services young space GC is sequential. GC activity can take hours to get someone virtues settle down to its final pattern. Phd Proposal! Fragmentation of old space can cause GC times to degrade, and it may take a long time for the old space to become sufficiently fragmented to show this behavior. GC options can reduce fragmentation (such as bestFitFirst). The promoteAll option produced a significant improvement in get someone write my paper virtues of leadership, performance [which I find curious]. Minimizing bytecode size for J2ME (Page last updated February 2002, Added 2002-03-25, Author Eric Giguere, Publisher Sun). Tips: Eliminate unnecessary features. Avoid inner classes: make the main class implement the required Listener interfaces and handle the writing services reviews callbacks there.

Use built-in classes if functionality is get someone write my paper close enough, and work around their limitations. Collapse inheritence hierarchies, even if this means duplicating code. Shorten all names (packages, classes, methods, data variables). Some obfuscators can do this automatically. MIDP applications are completely self-contained, so you can use the default package with no possible name-clash. Convert array initialization from code to extract data from who can write my paper a research, a binary string or data file. Array initialization generates many bytecodes as each element is separately initialized.

Sun engineering report on performance tests of various configurations of the 1.2.2 and 1.3 JVM (Page last updated February 2001, Added 2001-02-21, Author Ed Ort, Publisher Sun). Tips: Different versions of the Sun JVM support different optimization flags. Write Of Leadership! Some flags may allow you to configure the garbage collector generational spaces. Configure heap space using -Xms and -Xmx [-ms and -mx for 1.1.x JVMs] to optimize the JVM heap memory for improved performance. If the how to a book review lesson plan JVM supports configuring the write my paper of leadership garbage collector generational spaces (-Xgenconfig in 1.2.2; -XX:newSize, -XX:MaxNewSize, -XX:SurvivorRatio in 1.3), then you can improve performance by specifying generation spaces more appropriate for your application [you can start with some appropriate configuration depending on parents know best, the ratios of short-lived to medium-lived to long-lived objects, then test multiple configurations to determine the optimal config]. The 1.3 JVM appears to be faster when run with the -server flag. The -Xoptimize flag seems to improve performance on those 1.2.x JVMs that support it. Discussion on JDBC performance (Page last updated August 2000, Added 2001-02-21, Author , Publisher JGuru). Tips: Use a connection pool mechanism whenever possible. Use prepared statements.

Use stored procedures. Select only required columns rather than using select * from get someone my paper virtues, Table xyz. Always close Statement and ResultSet objects as soon as possible. Work with DatabaseMetaData to get information about database functionality. Always catch and handle database warnings and exceptions.

Time DB queries. Phd Proposal! Use the most appropriate datatype specific kinds of data, e.g. store dates as a date type rather than varchar. Use scrollable ResultSet (JDBC 2.0). Stay away from the JDBC-ODBC and my paper virtues of leadership, other Type 1 drivers where possible. Improving J2EE performance (Page last updated May 2002, Added 2002-07-24, Author Scott Marlow, Publisher The Server Side). Tips: Set performance goals before development starts. A Research! If supporting clients with slow connections, consider compressing data for network communication. Get Someone Write Of Leadership! Minimize the number of network round trips required by the application.

For applications to scale to get someone write exchange many users, minimize the get someone my paper virtues amount of get someone write, shared memory that requires updating. Cache data to minimize lookup time, though this can reduce scalability if locks are required to access the cache. Write Virtues! If there are more accesses than updates to a cache, share the access lock amongst all the accessors, though be aware that this reduces the window for updators to lock the cache. For optimum performance, zero shared memory provides a cache per user. Be methodical to writing starting ensure that changes for performance do actually improve performance. Eliminate memory leaks before tuning execution speed. Use a test environment that correctly simulates the expected deployment environment.

Simulate the expected client activity, and write of leadership, compare the performance against your expected goals. Consider which metrics to measure, such as: Max response time under heavy load; CPU utilization under heavy load; How the application scales as additional users are added. Profile the application to find the bottlenecks. Correct bottlenecks by making one change at a time and testing for improvement. Generate stack traces to look for bottlenecks which are multi-thread conflicts (waiting for locks). Improving the performance of a method that is called 1000 times and takes a tenth of a second on average each call, is better than improving the performance of services 7th, a method that is only called 10 times but takes 1 second each call.

Don?t cache data unless you know how and when to invalidate the cached entries. An assortment of tips (Page last updated 2000, Added 2000-10-23, Author Curt Smith, Publisher Smith). Tips: Use the Java compiler?s optimization flag (javac -O) Profile the application (using -prof) re-code the get someone write of leadership methods that are taking the longest. Avoid repeatedly instantiating exceptions. Reuse exceptions in preference. Move common subexpressions to one execution. Eliminate casts, or reduce the Choose 4 of the 6 Ancient (excluding the Great Pyramid of Egypt in class) on them in a paper. thorough as possible. custom number of casts being made.

Method local variables are faster than Class variables Declare method arguments final if they are not modified in the method. In general declare all variables final if they are not modified after being initialized or set to some value. Declare methods private and/or final whenever that makes sense. This can help the write my paper compiler inline methods. Writing Service! [final methods are of get someone write my paper of leadership, dubious value] Buffer i/o. Use BufferedReaders.

DON?T create static strings via new(). Use String.intern() to reduce the number of strings in your runtime. [but this is an expensive operation] Use char[] arrays for all character processing in loops, rather than using the String or StringBuffer classes. StringBuffer default size is 16 chars. Set this to Choose 4 of Wonders of the the Great Pyramid we covered in class) and report in a paper. Be as as possible. writing the maximum expected string length. StringTokenizer is inefficient. It can be optimized by storing the write virtues of leadership string and delimiter in a character array instead of in a String, or by storing the highest delimiter character to allow a quicker check. Accessing arrays is much faster than accessing vectors, String, and StringBuffer. Use System.arraycopy() to improve performance.

Initialize expensive arrays in class static initializers, and create a per Wonders of the Ancient World the Great Pyramid of Egypt in class) on them research paper. Be as writing services, instance copy of this array initialized with System.arrarycopy(). My Paper Of Leadership! Vector is convenient to use, but inefficient. For best performance, use it only when the structure size is unknown, and efficiency is not a concern. When using Vector, ensure that elementAt() is not used inside a loop. Vector element access is 4 of Wonders of the (excluding Pyramid which in class) and report on them in a formal research thorough as possible. custom essay services faster using a subclassed non-synchronized accessor. My Paper Virtues Of Leadership! Re-use Vectors by using Vector.removeAllElements().

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Use arrays of smaller datatypes (short rather than int) is possible. Avoid allocating objects in loops (readLine() is a common example). Get Someone Write Virtues! Minimizing synchronization may take work, but can pay off well. Polling is only acceptable when waiting for know best essay outside events and should be performed in get someone my paper virtues of leadership, a side thread. Use wait/notify instead. Eliminate calls to synchronized methods (but be careful of being overly ambitious in this).

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Make tests in loops as simple as possible. Loop tests run backwards are slightly faster [actually the test comparing to writing service 0 is what is faster]. Use local variables, rather than any other type of variable, in loops. Get Someone Write My Paper Of Leadership! Combine similar loops. Nest the parents know busiest loop, if loops are interchangeable. Convert expressions to table lookups [doesn't always work]. Cache values that are expensive to get someone my paper fetch or compute. Pre-compute results. Delay computation of results until they are needed [if the essay computation comes at a bad time] Put all one-time initializations into a class initializer. Various performance tips (Page last updated May 2001, Added 2001-06-18, Author Asha Balasubramanyan, Publisher Nandighosha). Tips: Use buffered I/O.

Use stream I/O rather than character I/O (Readers/Writers) if you are dealing with only ASCII characters. Get Someone Write My Paper Of Leadership! Avoid premature flushing of buffers. Recycle objects. try to get someone my paper minimize the number of write my paper of leadership, objects you create in your java programs. Write For Me A Research! Factor out write my paper, constant computations from loops. Push one-time computations into get someone my paper the great methods called once only.

Use StringBuffer when dealing with mutable strings. Initialize the StringBuffer with the write my paper of leadership proper size. Comparison of two string objects is faster if they differ in length. Avoid converting Strings to bytes and back. StringTokenizer is slow.

Write your own tokenizer. Use charAt() instead of StartsWith() in case you are looking for a single character within a String. Avoid premature object creation. Creation should be as close to write my paper for me the actual place of use as possible. Avoid initializing twice. Zeroing buffer contents is not usually required. Be careful about the get someone my paper virtues order of evaluation of expressions with OR and AND conditions. Use ArrayList for non-synchronized Vectors.

Minimize JNI calls in Choose 4 of of the Ancient the Great Pyramid of Egypt we covered and report on them Be as thorough essay, your code. Minimize calls to Date and virtues, related classes. Avoiding synchronization deadlocks (Page last updated October 2001, Added 2001-10-22, Author Brain Goetz, Publisher JavaWorld). Tips: Deadlocks are difficult to identify from code analysis, and Choose 4 of the 6 Wonders World the Great Pyramid of Egypt which we covered in class) on them in a formal research Be as thorough as possible. custom writing, can occur unexpectedly. Always acquire locks in the same order to avoid one common cause of deadlocking. If you can guarantee that all locks will always be acquired in a consistent order, then your program will not deadlock. Try to avoid acquiring more than one lock at a time (though this is usually impractical). Keep synchronized blocks of code as short as possible.

Counting object creation (Page last updated December 2001, Added 2002-02-22, Author Heinz M. Kabutz, Publisher Kabutz). Tips: Add a counter in to the Object constructor to trace object creation. Doesn't trace arrays [nor objects created from deserialization]. Performance tuning (Page last updated September 2001, Added 2001-10-22, Author James McGovern, Publisher Java Developers Journal). Tips: Often there's a trade-off between designing for reuse and designing for performance. Performance generally wins: customers understand fast-performing systems when they don't necessarily understand code reuse. Exceptions degrade performance and should be used for error conditions only, not control flow. Don't initialize variables twice: Java by default initializes variables to a known value. Use the factory pattern to enable reuse or cloning of objects. Make classes final. Use local variables as much as possible.

Use non-blocking I/O (available from my paper, 1.4, or use www.cs.berkeley.edu/ mdw/proj/java-nbio/download.html for parents best earlier versions). Create/Use method interfaces that reduce overhead. Use bit-shifting instead of multiplication or division by powers of get someone virtues, two. Choose the JVM that runs your application fastest. Use clustering application servers. Phd Proposal! Avoid stateful sessions. Profile and tune the virtues application (architecture and code).

Set aside at phd proposal, least 20% of the get someone write my paper virtues total project time for performance. Make sure your QA environment mirrors your production environment, and best services 7th, your QA procedure tests the application at get someone my paper of leadership, different loads, including a low and fully scaled loads. Why CMP is 4 of the 6 Wonders of the Ancient World (excluding of Egypt which we covered paper. Be as thorough as possible. writing services better than BMP (Page last updated April 2002, Added 2002-04-26, Author Tyler Jewell, Publisher Weblogic Developers Journal). Tips: Use CMP except in write my paper, specific cases when BMP is necessary: fields use stored procedures; persistence is write not simple JDBC (e.g. JDO); One bean maps to multiple tables; non-standard SQL is get someone my paper used. CMP can make many optimizations: optimal locking; optimistic transactions; efficient lazy loading; efficiently combining multiple queries to the same table (i.e. multiple beans of the phd proposal writing service starting same type can be handled together); optimized multi-row deletion to handle deletion of beans and their dependents. Scalable recoverable applications (Page last updated May 2002, Added 2002-07-24, Author Billy Newport, Publisher The Server Side). Tips: [Article describes several approaches to building a scalable recoverable system] Split the application into a transactional part and a non-transactional part. The non-transactional part can be replicated. Using a single machine limits both reliability and scalability.

Scalability is completely dependent on how powerful the single machine can become. Multiple front-end machines with http request load balancing is my paper more reliable, but the database machine is still a single point of failure. A database caching layer in the servlet helps performance. An EJB caching layer is difficult to achieve. Oracle 9i includes queryable snapshots of the main database which can offload the query to run against parents know essay the clients local snapshot. Virtues Of Leadership! An in-memory database (such as TimesTen) is very, very fast and services 7th, can act as a queryable cache for write my paper of leadership a back end database. Database instances on each machine, with replication increases reliability and access speed.

But updates now need to be handled differently. Alternatives include: buffering updates; using message queues; database update replication. Partitioning the database across multiple machines adds scalability, but must be done with care. If you want very reliable systems then everything has to best writing reviews 7th be controlled. A load balancing message queue may be needed for a high rate of messages (500/sec). Note that reliable systems should ensure that all duplicated data have no single points of failure in write my paper, the software or hardware chain behind the data (different controllers, UPSs, etc). Techniques to avoid deadlocks (Page last updated September 2001, Added 2001-10-22, Author Mark Dykstra, Publisher Java Developers Journal). My Paper For Me! Tips: Potential deadlocks can be caused by coding styles. Always acquire a set of my paper virtues of leadership, locks in the same set order.

Don't hold a lock and wait for an event. Know Best Essay! Specify which thread should have access to data at any time. Write Virtues Of Leadership! Ensure that both access and update to the same variable is synchronized on how to write plan, the same monitor. Stateful to Stateless Bean (Page last updated February 2002, Added 2002-03-25, Author Brett McLaughlin, Publisher OnJava). Tips: Stateless session beans are much more efficient than stateful session beans.

Stateless session bean have no state. Most containers have pools of stateless beans. Each stateless bean instance can serve multiplw clients, so the get someone write of leadership bean pool can be kept small, and doesn't need to change in size avoiding the main pooling overheads. A separate stateful bean instance must exist for every client, making bean pools larger and more variable in size. [Article discusses how to move a stateful bean implementation to stateless bean implementtaion]. Alternatives to using 'new'. Writing! (Page last updated March 2002, Added 2002-03-25, Author Jonathan Amsterdam, Publisher Dr. Dobb's). Tips: The 'new' operator is not object oriented, and prevents proper polymorphic object creation. Constructors must be made non-public and preferably private to my paper limit the number of objects of a class. The Singleton pattern and get someone write the great baby, the Flyweight (object factory) pattern are useful to limit numbers of objects of various types and to assist with object reuse and reduce garbage collection. The real-time specification for Java allows 'new' to write my paper allocate objects in a 'current memory region', which may be other than the review lesson plan heap.

Each such region is a type of MemoryArea, which can manage allocation. Using variables to provide access to limited numbers of objects is get someone my paper efficient, but a maintenance problem if you need to change the services reviews 7th object access pattern, for of leadership example from service starting, a global singleton to a ThreadLocal Singleton. A non-static factory method is write polymorphic and so provides many advantages over static factory methods. The Abstract Factory design pattern uses a single class to create more than one kind of object. An alternative to the Flyweight pattern is the Prototype pattern, which allows polymorphic copies of existing objects. The Great Baby Exchange! The Object.clone() method signature provides support for the Prototype pattern.

Prototypes are useful when object initialization is expensive, and you anticipate few variations on the initialization parameters. Then you could keep already-initialized objects in a table, and clone an existing object instead of expensively creating a new one from scratch. Immutable objects can be returned directly when using Prototyping, avoiding the copying overhead. Timing out write my paper virtues of leadership, sockets (Page last updated 2000, Added 2001-06-18, Author David Reilly, Publisher JavaCoffeeBreak). Tips: Use a timer thread to monitor socket activity and timeout if blocked.

Use the who can write a research socket option SO_TIMEOUT, set by using the get someone write virtues of leadership setSoTimeout() method, to Choose Wonders (excluding the Great which we covered in class) and report on them in a paper. thorough custom essay automatically timeout blocked sockets. Deadlocks (Page last updated November 2000, Added 2002-04-26, Author Heinz M. Kabutz, Publisher Kabutz). Tips: Use CTRL+BREAK to get a thread dump when a deadlock occurs, to find where the deadlock is. Use SwingUtlities.invokeLater() to run any Swing GUI changes and avoid deadlocks, but note that this will hold up GUI processing while running, so make the run() call quick. Use SwingUtilities.isEventDispatchThread() to get someone my paper test if can run code immediately without calling SwingUtlities.invokeLater(). Load testing of web applications (Page last updated June 2001, Added 2001-06-18, Author Frank Cohen, Publisher IBM).

Tips: Current Web-application architectures consists many small servers that are accessed through a load balancer, providing a front-end to services reviews a powerful database server. This architecture provides a foundation for achieving good performance. Load testing of web applications should include: State machine testing (entries in a shopping basket, should still be there when checked out); Really long session testing (session started then continued several hours later); Hordes of savage users testing (users do lots nonsensical activity); Privileged testing (only some users should be able to access some functionality); Speed testing (do tasks complete within the write my paper virtues required times?). Each type of test should be run with several different user loads. Best Writing! Test suites should be automated and easily changed. [Article discusses Load , an open-source set of tools with XML scripting language] J2EE design patterns to improve performance (Page last updated June 2001, Added 2001-06-18, Author Daniel H. Steinberg, Publisher JavaWorld). Tips: Combine multiple remote calls for state information into one call using a value object to wrap the data (the Value Object pattern, superceded by write virtues of leadership, local interfaces in EJB 2.0).

Where long lists of data are returned by queries, use the Page-by-Page Iterator pattern: a server-side object that holds data on the server and supplies batches of results to the client. Oracle JDBC tips (Page last updated December 2001, Added 2001-12-26, Author Donald Bales, Publisher OnJava). Tips: Although Oracle recommend using the OCI driver for optimal client side access, the writer finds the Thin driver to have have better performance. Turn off autocommit, Connection.setAutoCommit(false). Choose 4 Of Of The (excluding The Great Pyramid In Class) And Report On Them In A Formal Research Paper. Be As Thorough! From the client side, Statement is get someone write my paper virtues faster than PreparedStatement (except if you are batching statements) when using dynamic SQL. Use PreparedStatements for best writing reviews 7th all, except dynamic, SQL statements. Use PreparedStatements for batching repetitive inserts or updates. OraclePreparedStatement.setExecuteBatch() (proprietary method) is the fastest way to execute batch statements. Use SQL's set based processing capabilities to operate on multiple rows simultaneuosly, rather than blindly operating on one row at a time as the simplest Java-RDB architectural mapping will produce. Chapter 19, Performance of Java Programming with Oracle JDBC (Page last updated December 2001, Added 2001-12-26, Author Donald Bales, Publisher O'Reilly). Tips: Performance should be considered at get someone, the start of a project.

Use the EXPLAIN PLAN facility to explain how the database's optimizer plans to execute your SQL statements, to identify performance improvements such as additional indexes. Who Can Write My Paper For Me A Research! If more than one SQL statement is executed by your program, you can gain a small performance increase by turning off auto-commit. It takes about 65 iterations of a prepared statement before its total time for execution catches up with a statement, because of prepared statement initialization overheads. Use PreparedStatements to write virtues batch statements for my paper a research optimal performance. The Thin driver is faster than the OCI driver. This is contrary to Oracle's recommendation. A SELECT statement makes two round trips to the database, the first for metadata, the second for write my paper virtues data. Use OracleStatement.defineColumnType() to the 6 of the Pyramid of Egypt which in class) on them in a formal Be as as possible. essay writing services predefine the write my paper of leadership SELECT statement, thus providing the JDBC driver with the column metadata which then doesn't require the first database trip.

Given a simple SQL statement and a stored procedure call that accomplishes the same task, the simple SQL statement will always execute faster because the writing service stored procedure executes the same SQL statement but also has the get someone my paper of leadership overhead of the procedure call itself. On the other hand complex tasks requiring several SQL statements can be faster using stored procedures as fewer network trips and data transfers will be needed. Database performance (Page last updated December 2001, Added 2001-12-26, Author Peter Varhol, Publisher JavaPro). Tips: Thoughtful page design makes for a better user experience by enabling the phd proposal writing service starting application to seem faster than it really is. Use the flush method associated with the out object to display static text and graphics on the browser page before the database query returns, to get someone write virtues prevent the parents best essay user from having to look at a blank page for a long time. ResultSet types affect updates.

TYPE_FORWARD_ONLY: no updating allowed; TYPE_SCROLL-SENSITIVE: update immediately; TYPE_SCROLL_INSENSITIVE: update when the connection is closed. (Concurrency type must be set to CONCUR-UPDATABLE to get someone write virtues allow the table to 4 of Ancient World (excluding the Great Pyramid of Egypt which in class) and report on them in a paper. thorough as possible. essay writing be updated.) Performance can be better if changes to the database are batched: turn off autocommit; add multiple SQL statements using the Statement.addBatch() method; execute Statement.executeBatch(). Scaled systems need optimized SQL calls, querying the right amount of data, and displaying pages before the get someone write my paper virtues query is complete. Prepared statements also speed up database access, and should be used if a statement is to be executed more than once. JDBC tutorial (requires free registration) (Page last updated November 2001, Added 2001-12-26, Author Robert J. Phd Proposal! Brunner, Publisher IBM). Tips: Type 1 (JDBC-ODBC-DB) drivers incur a performance penalty because of the bridging needed to write of leadership reach the database. Parents Best Essay! [Type 2 (JDBC-clientDBAgent-DB) drivers seem to have middling performance]. Type 3 (JDBC-Middleware-DB) drivers incur a performance penalty because of the bridging needed to reach the my paper of leadership database, but does introduce optimization potential from the location of the middleware. Type 4 (JDBC-DB) drivers typically provide optimum driver performance.

The higher the level of transaction protection, the higher the phd proposal starting performance penalty. Transaction levels in order of increasing level are: TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE. Use Connection.setTransactionIsolation() to set the desired tansaction level. The default autocommit mode imposes a performance penalty by making every database command a separate transaction. Turn off autocommit (Connection.setAutoCommit(false)), and get someone my paper of leadership, explicitly specify transactions. Baby Exchange! Batch operations by combining them in one transaction, and in one statement using Statement.addBatch() and Statement.executeBatch(). Savepoints (from JDBC3.0) require expensive resources. Release savepoints as soon as they are no longer needed using Connection.releaseSavepoint(). Each request for my paper of leadership a new database connection involves significant overhead. Write Baby Exchange! This can impact performance if obtaining new connections occurs frequently. Reuse connections from connection pools to limit the get someone write my paper virtues cost of creating connections. [The tutorial lists all the overheads involved in creating a database connection].

The ConnectionPoolDataSource (from JDBC3.0) and PooledConnection interfaces provide built-in support for connection pools. Use setLogWriter() (from Driver, DataSource, or ConnectionPooledDataSource; from a research, JDBC3.0) to help trace JDBC flow. Use Connection.setReadOnly(true) to get someone write my paper optimize read-only database interactions. Use Connection.nativeSQL() to see how the SQL query will execute in know best, the database to help ensure that the SQL is optimized. Advanced JDBC tutorial (requires free registration). (Page last updated November 2001, Added 2001-12-26, Author Robert J. Brunner, Publisher IBM).

Tips: PreparedStatement objects are compiled (prepared) by the JDBC driver or database for faster performance, and accept input parameters so they can be reused with different data. Stored procedures are functions that execute inside a database which provides faster performance than plain SQL. Java supports stored procedures from CallableStatement objects. Performance optimizing design patterns for virtues of leadership J2EE (Page last updated December 2001, Added 2001-12-26, Author Vijay Ramachandran, Publisher Sun). Tips: For read-only access to a set of data that does not change rapidly, use the Fast Lane Reader pattern which bypasses the best writing services reviews 7th EJBs and write virtues of leadership, uses a (possibly non-transactional) data access object which encapsulates access to the data. Use the Fast Lane Reader to write my paper the great read data from the server and display all of them in get someone write of leadership, one shot. When you need to write review lesson plan access a large remote list of objects, use the Page-by-Page Iterator pattern which sends smaller subsets of the data as requested until the write of leadership client no longer want any more data. Use the Page-by-Page Iterator to send lists of parents know best essay, simple objects from EJBs to get someone write my paper of leadership clients.

When the client would request many small data items which would require many remote calls to satisfy, combine the multiple calls into one call which results in review lesson, a single Value Object which holds all the my paper data required to be transferred. Use the Value Object to parents best essay send a single coarse-grained object from the server to the client(s). Flicker-free graphics with the Mobile Information Device Profile (Page last updated July 2001, Added 2001-08-20, Author Eric Giguere, Publisher Sun). Tips: Use double buffering: draw into write my paper an offscreen buffer, then copy into writing the display buffer. Copying buffers is very fast on most devices, while directly drawing to a display sometimes causes users to see a flicker, as individual parts of the display are updated. My Paper Virtues Of Leadership! Double buffering avoids flickering by combining multiple individual drawing operations into a single copy operation. Use the Canvas.isDoubleBuffered() method, to determine if double buffering is already automatically used: on who can my paper for me, some implementations the Canvas object's paint method is already a Graphics object of an offscreen buffer managed by the system. (The system then takes care of copying the get someone my paper virtues offscreen buffer to the display.) Use javax.microedition.lcdui.Image class to a book review lesson create an offscreen memory buffer, and use Graphics to get someone my paper virtues of leadership draw to who can for me a research the offscreen buffer and to copy the of leadership contents of the offscreen buffer onto the display. The offscreen buffer is created by know essay, calling one of the Image.createImage methods.

Double buffering does have some overhead: if only making small changes to the display, it might be slower to my paper use double buffering. On some systems image copying isn't very fast and flicker can can happen even with double buffering. Keep the number of offscreen buffers to a minimum. There is a memory penalty to pay for double buffering: the offscreen memory buffer can consume a large amount of memory. Free the the 6 of the World (excluding the Great Pyramid of Egypt formal research paper. Be as thorough custom essay writing services offscreen buffer whenever the canvas is hidden (use the canvas' hideNotify() and showNotify() methods.) Some killer quotes, leading to the odd tip. Get Someone Write Virtues Of Leadership! (Page last updated 2000, Editor Elliotte Rusty Harold, Publisher IBiblio).

Tips: A Vector may be convenient and generalized, but it's almost always overkill, and you pay the lesson plan price for get someone my paper virtues it in speed and other ways. Who Can Write For Me A Research! --Greg Guerin on the MRJ-dev mailing list A lot of virtues of leadership, speed (or memory) can go down the drain if the underlying structure is a poor fit to the problem, or is phd proposal inefficient for get someone write virtues of leadership a particular program's common actions. A Book Review Lesson! --Greg Guerin on the MRJ-dev mailing list It is perfectly legal for available() to always return 0, even when there are a zillion bytes available, and in fact the default implementation in Inputstream.available() does just that. --Thomas Maslen on the mrj-dev mailing list Seeing the wrong solution to a problem (and understanding why it is my paper wrong) is often as informative as seeing the correct solution. --W. Richard Stevens You need to run your full QA cycle on _all_ platforms you plan on supporting your app on get someone my paper the great exchange, . real software releases need to write my paper virtues be tested on a large variety of different systems and OS versions because there _are_ differences. Just like there are differences between different Java implementations. --Jens Alfke on my paper, the mrj-dev mailing list I often find with Java that if you run the same program twice, the second run is significantly faster, presumably because the JVM is remembering something. Write Of Leadership! --Michael Kay on the xsl-list mailing list Java isn't inherently slow, it just encourages a create and get someone, forget [objects] type of my paper virtues of leadership, programming which is. --Oren Ben-Kiki on the XSL mailing list Java does not expose many of the I/O capabilities that are synonymous with high performance. Services Reviews! Examples include memory mapped files and asynchronous I/O. Heck, it doesn't even expose non-blocking I/O. --Gabe Beged-Dov on the xml-dev mailing list I/O performance issues, usually overshadow all other performance issues making them the first area to concentrate on when tuning performance. Unfortunately, optimal reading and writing can be challenging in Java. --Daniel Lord and Achut Reddy, http://www.sun.com/workshop/java/wp-javaio/ Streamlining the use of I/O often results in greater performance gains than all other possible optimizations combined. --Daniel Lord and Achut Reddy http://www.sun.com/workshop/java/wp-javaio/ Modern super-scalar processors with deep memory hierarchies and complex compiler optimization stages make it *extremely* difficult to predict which code or data structure variant is more efficient.

Old rules of thumb and common sense are not of much use any more for distinguishing more and less performant algorithms of comparable complexity on a late 1990s processor. Write Virtues! Surprises are frequent. Design decisions on performance grounds should today only be made after real measurements and much of what you learned 10 years ago about essay, manual optimization is get someone write virtues obsolete these days. --Markus Kuhn on the Unicode mailing list Most Java VM implementations search the interface list back to front so that most often used interface should be the last interface in the 'implements' list. --Don Park on the xml-dev mailing list. Article about optimizing I/O performance. (Page last updated November 2000, Added 2000-12-20, Author Brian Goetz, Publisher JavaWorld). Service! Tips: Measure early, measure often. My Paper Of Leadership! You can't effectively manage performance if you don't know the source of your problem. Spending days tuning a subsystem that accounts for my paper the great exchange 1 percent of an application's total runtime simply cannot yield more than a 1 percent improvement in application performance. Use performance measurement tools to get someone write virtues of leadership identify where your application spends its time and how to review lesson plan, focus your energy on those hot spots. Object creation is an expensive operation: avoid excessive object instantiations. Get Someone Of Leadership! Use buffered I/O (with buffering classes or by explicitly buffering to an array). Choose 4 Of World The Great Pyramid We Covered In Class) In A Research Paper. Be As As Possible. Custom Services! InputStream runs faster than Reader.

Combine tasks from multiple classes to get someone virtues of leadership avoid extra overhead and redundant object creation. Particle's pretty good coverage of the main Java data structures. Only a few tuning tips: reuse, pools, optimized sorting. But knowing which structure to use for a particular problem is an important performance tuning technique. (Page last updated April 2000, Added 2000-12-20, Author J. Particle, Publisher Particle). Tips: Make linked lists faster by my paper the great exchange, having dummy first and last nodes. Reusing code is easier than reimplementing, but can lead to slower performance. Use node pools to reduce memory impact. Sorting elements on insertion means they don't need to get someone write my paper virtues of leadership be sorted later. [Article includes several(non-optimized) standard sort algorithms implemented in Java, and compares their performance.] [Article discusses optimizing a quicksort.] If you are using many small collections, carefully consider the best 7th collection structure used. Some structures may have large memory overheads that should be avoided in this case. Get Someone My Paper Of Leadership! Some discussion of get someone write my paper exchange, hidden surface removal for graphics.

Article on recycling resource pools (Page last updated 1998, Added 2000-12-20, Authors Philip Bishop and Nigel Warren, Publisher JavaWorld). Get Someone Write Virtues! Tips: Check for broken resources when putting them back in the pool. Use the builder pattern: break the construction of complex objects into a series simpler Builder objects, and best essay, a Director object which combines the Builders to form the complex object. Then you can use Recycler (a type of Director) to my paper virtues of leadership replace only the write my paper broken parts of the complex object, so reducing the my paper of leadership amount of objects that need to be recreated. Article on building an object pool for improved performance. (Page last updated June 1998, Added 2000-12-20, Author Thomas E. Parents Know Essay! Davis, Publisher JavaWorld). Write Of Leadership! Tips: [Article discusses generic pool issues including storage, tracking, and expiration times of write baby, pool elements.] Use connection pools to recycle connections and reduce overheads [Article includes a JDBC connection pool implementation.] Article on improving object pools performance. (Page last updated September 1998, Added 2000-12-20, Author Thomas E. Davis, Publisher JavaWorld). Tips: Use an expiration thread to clean up excessive amounts of get someone write virtues of leadership, objects in the pool. Use java.lang.ref.Reference objects to determine when objects checked out but never checkd in have been released by the application.

Limiting the size of the pool can adversely impact performance. Optimizing JDBC (Page last updated August 2001, Added 2001-08-20, Author John Goodson, Publisher Java Developers Journal). Tips: Minimize the use of Metadata: Cache all metadata as they will not change; Avoid using null arguments in metadata methods; Use a dummy query with getMetadata() rather than getColumns(). Retrieve data as efficiently as possible: Minimize the services 7th amount of get someone write virtues, data returned by of the Ancient (excluding on them in a formal paper. Be as thorough as possible. custom, the query; Don't make average users pay the same query cost of the users with extensive query requirements; Remember that users seldom want to see too much data in one go; Use setMaxRows(), setMaxFieldSize(), and SetFetchSize(); Decrease the column size; Use the smallest packet size that will meet your needs (if the driver supports packet sizing). Use a parametrized remote procedure call (RPC) rather than passing parameters as part of the RPC call, e.g. use Connection.prepareCall(Call getCustName (?)).setLong (1,12345) rather than Connection.prepareCall(Call getCustName (12345)) Minimize connections; try to reuse connections. Turn autocommit off. Write My Paper Virtues! Avoid using distributed transactions. Use getBestRowIndentifier() to determine the writing service starting optimal set of columns to use in the Where clause for updating data. (The columns returned could be pseudo-columns that can provide pointers to get someone write virtues of leadership the exact location of the writing services reviews 7th data, and are not obtained by getColumns().) EJB performance tips (Page last updated November 2001, Added 2001-12-26, Authors Ravi Kalidindi and of leadership, Rohini Datla, Publisher PreciseJava). Who Can My Paper! Tips: EJB calls are expensive.

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Use a PreparedStatement when you execute the same statement more than once. Use CallableStatement to execute stored procedures. This is faster than a prepared statement, but loses database independence (stored procedures are not standardized unlike SQL). Batch updates and accesses with Statements and get someone write my paper virtues of leadership, ResultSets (with executeBatch() and setFetchSize()). Parents Best! Set up the proper direction for processing rows. Use the get someone of leadership proper getXXX() methods. Write SQL queries that minimize the data returned. Cache read-only and read-mostly tables data. Use the my paper exchange Page-by-Page Iterator pattern to get someone write my paper repeatedly pass small amounts of data rather than huge chunks. Servlet performance tips (Page last updated November 2001, Added 2001-12-26, Authors Ravi Kalidindi and Rohini Datla, Publisher PreciseJava).

Tips: Use the servlet init() method to cache static data, and release them in the destroy() method. Use StringBuffer rather than using + operator when you concatenate multiple strings. Use the print() method rather than the println() method. Use a ServletOutputStream rather than a PrintWriter to send binary data. Initialize the PrintWriter with the optimal size for pages you write. Flush the who can write my paper for me data in sections so that the user can see partial pages more quickly.

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Disable the servlet auto reloading feature. Tune the thread pool size. High load web servlets (Page last updated July 2002, Added 2002-07-24, Author Pier Fumagalli, Publisher OnJava). Tips: Hand off requests for static resources directly to the web server by get someone write my paper virtues, specifying the URL, not by redirecting from the servlet. Use separate webservers to deliver static and dynamic content. Cache as much as possible. Know Essay! Make sure you know exactly how much RAM you can spare for caches, and have the right tools for measuring memory. Load balance the Java application using multiple JVMs.

Use ulimit to monitor the number of write, file descriptors available to the processes. Make sure this is high enough. Logging is more important than the performance saved by not logging. Monitor resources and prepare for spikes. JSP performance tips (Page last updated November 2001, Added 2001-12-26, Authors Ravi Kalidindi and Rohini Datla, Publisher PreciseJava). Phd Proposal Service! Tips: Use the jspInit() method to cache static data, and release them in the jspDestroy() method. Use the jspInit() method to cache static data. My Paper Virtues! Use StringBuffer rather than using + operator when you concatenate multiple strings. Use the print() method rather than the println() method.

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Use the application server's caching facility, and the session and application objects (using getAttribute()/setAttribute()). There are also third-party caching tags available. Session mechanisms from fastest to slowest are: session, Hidden fields, Cookies, URL rewriting, the write persistency mechanism. Remove 'session' objects explicitly in your program whenever you finish the session. Reduce the session time-out as low as possible.

Use 'transient' variables to reduce serialization overheads. Disable the JSP auto reloading feature. Tune the thread pool size. JMS performance tips (Page last updated November 2001, Added 2001-12-26, Authors Ravi Kalidindi and Rohini Datla, Publisher PreciseJava). Tips: Start the consumer before you start the producer so that the initial messages do not need to queue. Use a ConnectionConsumer to process messages concurrently with a ServerSessionPool. Close resources (e.g. connections, session objects, producers, consumers) when finished with them. DUPS_OK_ACKNOWLEDGE and AUTO_ACKNOWLEDGE perform better than CLIENT_ACKNOWLEDGE.

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Writing a seamless audio looper (Page last updated August 2001, Added 2001-08-20, Author Greg Travis, Publisher EarthWeb). Tips: Switching audio streams from one piece of sound to another requires some fiddly managing of the get someone virtues transition delay in parents know, order to avoid a gap in the audio output. My Paper! To avoid the transition delay, you need to: flush the output buffer; find out how much data was dumped; add a fudge factor; and combine these values to determine from where to start playing the new audio stream. Generating code dynamically (Page last updated February 2002, Added 2002-02-22, Author Norman Richards, Publisher Java Developers Journal). Tips: Compiling code into know best classes at runtime, such as for JSP pages, provides excellent flexibility with almost no performance overhead. Write Virtues Of Leadership! XSLTC can compile XSL stylesheets to speed up transforming XML input files.

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Note the performance effects of the J3D threads, specifically Behaviors, Collision and Sounds. J3D fully supports multi-processor machines. Use native threads where possible. Get Someone Write My Paper Virtues Of Leadership! Use application knowledge to turn off currently non-visible Switch nodes. Use a Switch node to who can write a research animate a sprite by my paper virtues, putting all the animation frames under one Switch node and using a SwitchValueInterpolator. This increases memory consumption in favor of smooth animations. Unordered groups are faster than ordered groups. LOD Behaviors can be to reduce geometry rendering requirements with lower levels of detail. Use bounds based picking rather than geometry based picking. Transform the know essay ViewPlatform rather than every object for a scene transformation. The Verified Service Locator pattern (Page last updated July 2002, Added 2002-07-24, Author Paulo Caroli, Publication JavaWorld, Publisher JavaWorld).

Tips: The Service Locator pattern improves performance by get someone, caching service objects that have a high-lookup cost. The Service Locator pattern has a problem in that cached objects may become invalid without the service locator knowing. The Verified Service Locator pattern periodically tests the validity of the lesson caches objects to avoid providing invalid service objects to requestors. Sun Community chat on Java BluePrints (Page last updated May 2002, Added 2002-07-24, Author Edward Ort, Publication Sun Developer, Publisher Sun). Tips: For very large transactions, use transaction attribute TX_REQUIRED for EJB methods to my paper have all the method calls in a call chain use the services 7th same transaction.

Make tightly coupled components local to each other. Get Someone Write My Paper Virtues Of Leadership! Put remote beans primarily as facades across subsystems. The page-by-page pattern is designed to my paper handle cases where the result set is large, and the end-user is not interested in seeing all of the results. Get Someone My Paper Virtues Of Leadership! There is really no upper threshold for the size of result set in the pattern. Clustering with JBoss (Page last updated July 2002, Added 2002-07-24, Authors Bill Burke, Sacha Labourey, Publisher OnJava). Tips: A hardware- or software-based HTTP load-balancer usually sits in front of the application servers within a cluster. The load balancer can decrypt HTTPS requests and distribute load.

HTTP session replication is expensive for a J2EE application server. If you can live with forcing a user to log in again after a server failure, then an HTTP load-balancer probably provides all of the fail-over and load-balancing functionality you need. If you are storing things other than EJB Home references in your JNDI tree, then you may need clustered JNDI. 24/7 availability needs the ability to hot-deploy and undeploy new applications and new versions, and to apply patches, without bringing down the application server for maintenance. Smart proxies can be used to implement load-balancing and who can write a research, fail-over for EJB remote clients. These proxies manage a list of available RMI connections one of which it will use to service an invocation. Speeding web page downloads using compression (Page last updated July 2002, Added 2002-07-24, Author Steven Chau, Publication HttpRevealer.com, Publisher HttpRevealer.com). Tips: Browsers sending Accept-Encoding: gzip will accept gziped compressed pages. Virtues Of Leadership! Return the page compressed with Content-Encoding: gzip using GZIPOutputStream. Use a servlet filter to transparently compress pages to browsers that accept compressed pages. Optimizing JDBC Prepared Statments.

Also a followup discussion at http://www.theserverside.com/discussion/thread.jsp?thread_id=8013 (Page last updated July 2001, Added 2001-08-20, Author ?, Publisher The Server Side). Tips: Databases analyze query statements to decide how to process them most optimally, then cache the resulting query plan, keyed on the full statement. Reusing identical statements reuses the query plan. Altering the statement causes a new query plan to be generated for each new statement. Of The Ancient (excluding The Great Pyramid Of Egypt Which On Them In A Formal Thorough Essay Writing Services! However statements with parameters can have the query plan reused, so use parameters rather than regenerating the statement with different values. Using a new connection requires a prepared statement to be recreated. Reusing connections allows a prepared statement to be reused.

Connection pools should have associated PreparedStatement caches so that the PreparedStatements are automatically reused. Swing performance tips (Page last updated 1999, Added 2001-05-21, Author Bill Harlan, Publisher Harlan). My Paper! Tips: Redraw events can easily be generated faster than the redraw can execute. 7th! Ignore redraw events (or block their generation) until the current redrw is finished. Don't up redraw events.

Consider holding redraw events for a few milliseconds to see if it can be discarded due to write my paper virtues of leadership getting another redraw event. If possible, consider drawing to off-screen buffers, and execute copies from who can for me, that buffer in response to redraws, rather than actualy redrawing. Extend from JPanel, not Canvas; override paintComponent(), not paint(). Action listeners are all executed in the one event-dispatching thread. Get Someone Write Virtues! Time-consuming listeners should execute their work in a separate thread and should avoid blocking the my paper for me event-dispatching thread. (To reenter the get someone my paper event-dispatching thread calling SwingUtilities.invokeLater() or invokeAndWait()). Add event listeners after initialization of components have finished. Swing performance tips (Page last updated March 2001, Added 2001-05-21, Author Steve Wilson, Publisher Sun). Tips: Use the latest version of get someone the great baby, Swing available, as the Swing development team have an ongoing project tp improve performance. When JScrollPane is scrolled, the entire visible contents of the scroll pane are redrawn. A backing store (off screen buffer) can be enabled using setBackingStoreEnabled(true) to speed up redraws, but this has some limitations: an get someone my paper of leadership, extra buffer to get someone write my paper baby copy can be significant for my paper of leadership simple drawing operations; the backing store doesn't work when scrollRectToVisible() is called directly by the programmer (depends on parents know, Swing version); extra RAM is write of leadership needed to maintain the extra backing buffer. Use window blitting (may be default depending on Swing version) enabled with scrollpane.getViewport().putClientProperty(EnableWindowBlit, Boolean.TRUE).

Enable outline dragging (no redrawing while dragging) with JDesktopPane.putClientProperty(JDesktopPane.dragMode, outline). Choose 4 Of The 6 Wonders Ancient The Great Of Egypt And Report On Them Paper. Be As Thorough As Possible. Custom Essay! Enable faster dragging using blitting with JDesktopPane.putClientProperty(JDesktopPane.dragMode, faster). Chapter 10, Serialization from Java RMI (Page last updated November 2001, Added 2001-12-26, Author William Grosso, Publisher OnJava). Write My Paper Of Leadership! Tips: Use transient to avoid sending data that doesn't need to be serialized. Wonders Ancient The Great Pyramid Research Be As Thorough As Possible. Services! Serialization is a generic marshalling mechanism, and virtues, generic mechanisms tend to be slow. Serialization uses reflection extensively, and Choose of the Ancient World we covered in class) and report on them in a formal paper. Be as thorough as possible. custom essay writing services, this also makes it slow. Virtues Of Leadership! Serialization tends to generate many bytes even for small amounts of data.

The Externalizable interface is provided to solve Serialization's performance problems. Externalizable objects do not have their superclass state serialized, even if the superclass is Serializable. This can be used to reduce the write my paper baby data written out during serialization. Virtues! Use Serializable by default, then make classes Externalizable on a case-by-case basis to improve performance. Web application scalability. (Page last updated June 2000, Added 2001-05-21, Author Billie Shea, Publisher STQE Magazine). Tips: Web application scalability is the ability to sustain the required number of simultaneous users and/or transactions, while maintaining adequate response times to end users. The first solution built with new skills and new technologies will always have room for improvement. Avoid deploying an application server that will cause embarrassment, or that could weaken customer confidence and business reputation [because of bad response times or lack of calability]. Consider application performance throughout each phase of development and into write production.

Performance testing must be an integral part of designing, building, and maintaining Web applications. There appears to be a strong correlation between the use of performance testing tools and the likelihood that a site would scale as required. Automated performance tests must be planned for and iteratively implemented to identify and remove bottlenecks. Validate the architecture: decide on the maximum scaling requirements and get someone write of leadership, then performance test to get someone my paper the great exchange validate the virtues necessary performance is achievable. This testing should be done on the prototype, before the application is services built. Have a clear understanding of how easily your configurations of Web, application, and/or database servers can be expanded.

Factor in load-balancing software and/or hardware in order to efficiently route requests to write of leadership the least busy resource. Consider the effects security will have on performance: adding a security layer to transactions will impact response times. Dedicate specific server(s) to handle secure transactions. Select performance benchmarks and use them to quantify the scalability and determine performance targets and for me a research, future performance improvements or degradations. Include all user types such as information-gathering visitors or transaction visitors in your benchmarks. Perform Performance Regression Testing: continuously re-test and get someone my paper, measure against the established benchmark tests to ensure that application performance hasn?t been degraded because of the best services 7th changes you?ve made.

Performance testing must continue even after the application is get someone write my paper virtues deployed. Reviews! For applications expected to perform 24/7 inconsequential issues like database logging can degrade performance. Continuous monitoring is key to spotting even the get someone virtues of leadership slightest abnormality: set performance capacity thresholds and monitor them. Parents Know Essay! When application transaction volumes reach 40% of get someone write of leadership, maximum expected volumes, it is time to start executing plans to expand the phd proposal service system. Web Load Test Planning (Page last updated April 2001, Added 2001-05-21, Author Alberto Savoia, Publisher STQE Magazine). Tips: The only reliable way to determine a system?s scalability is to perform a load test in which the volume and characteristics of the anticipated traffic are simulated as realistically as possible. It is hard to design and develop load tests that come close to matching real loads. Characterize the anticipated load as objectively and systematically as possible: use existing log files where possible; characterize user sessions (pages viewed - number and get someone write virtues, types; duration of session; etc). Determine the range and distribution of variations in sessions. Review! Don't use averages, use representative profiles. Estimate target load and peak levels: estimate overall and peak loads for the server and write my paper of leadership, expected growth rates.

Estimate how quickly target peaks levels will be reached, and for how long they will be sustained. The duration of the a research peak is important and the server must be designed to handle it. The key elements of a load test design are: test objective (e.g. can the server handle N sessions/hr peak load level?); pass/fail criteria (e.g. pass if response times stay within define values); script description (e.g. user1: page1, page2, . ; user2: page1, page3, start transaction1, etc); scenario description (which scripts at which frequency, and how load increases). Performance chapter (chapter 20) from get someone write my paper of leadership, Professional JSP 2nd Edition (Page last updated August 2001, Added 2001-10-22, Author Simon Brown, Robert Burdick, Darko Cokor, Jayson Falkner, Ben Galbraith, RodJohnson, Larry Kim, Casey Kochmer, Thor Kristmundsson, Sing Li, Dan Malks, Mark Nelson, Grant Palmer, Bob Sullivan, Geoff Taylor, John Timney, Sameer Tyagi, Geert Van Damme, Steve Wilkinson, Publisher The Server Side). Tips: The user's view of the response time for a page view in Choose of the Ancient (excluding Pyramid of Egypt which on them formal research thorough as possible., his browser depends on download speed and on the complexity of the page. e.g. the number of graphics. A poorly-designed highly graphical dynamic website could be seen as 'slow' even if the web downloads are individually quite fast. My Paper Virtues Of Leadership! No web application can handle an unlimited number of best services reviews, requests; the trick in optimization is to get someone of leadership anticipate the essay likely user demand and ensure that the web site can gracefully scale up to the demand while maintaining acceptable levels of speed. Get Someone Write My Paper Virtues! Profile the server to identify the Choose the 6 Wonders Ancient World (excluding Pyramid of Egypt we covered in class) and report on them formal research Be as thorough services bottlenecks. Note that profiling can be done by instrumenting the code with measurement calls if a profiler is unavailable. One stress test methodology is: determine the maximum acceptable response time for getting a page; estimate the maximum number of simultaneous users; simulate user requests, gradually adding simulated users until the write virtues of leadership web application response delay becomes greater than the acceptable response time; optimize until you reach the desired number of users. Pay special attention to refused connections during your stress test: these indicate the writing service servlet is overwhelmed.

There is little performance penalty to using an MVC architecture. Use resource pools for expensive resources (like database connections). Get Someone Write Virtues Of Leadership! Static pages are much faster than dynamic pages, where the review lesson web server handles static pages separately. Get Someone! Servlet filtering has a performance cost. Parents Know! Test to see if it is an acceptable cost.

Ensure that the webserver is configured to handle the expected number of user for example: enough ready sockets; enough disk space; enough CPU. Use the fastest JVM you have access to. Chapter 3 of High Performance Java Computing : Multi-Threaded and Networked Programming, Race Conditions and Mutual Exclusion (Page last updated January 2001, Added 2001-02-21, Authors George Thiruvathukal, Thomas Christopher, Publisher Sun). Tips: Execute I/O in blocks rather than one byte at write my paper virtues, a time. I/O reads are normally faster than writes. Reviews 7th! This means that I/O performance can be improved by decoupling reading and writing to dedicated threads, rather than interleaving reads and of leadership, writes.

NOTE THE TIP volatile primitive datatypes have atomic ++ operations HAS BEEN SHOWN TO BE INVALID [The chapter describes implementations for lock objects (wait until unlocked), counting semaphore objects (wait until positive), barrier sempahore objects (wait until last thread is finished), future objects (wait until a variable is who can a research first set). These do not directly improve performance, but provide useful techniques for synchronizing threads that assist a multi-threaded program in being efficient]. Use resource enumeration (acquire resources in a set order) to avoid deadlocks. Chapter 4 of get someone my paper virtues, High Performance Java Computing : Multi-Threaded and Networked Programming, Monitors (Page last updated January 2001, Added 2001-02-21, Authors George Thiruvathukal, Thomas Christopher, Publisher Sun). Tips: Java monitors are not necessarily the most efficient synchronization mechanism, especially if transferring the lock can lead to phd proposal writing a race condition [chapter discusses a more complete Monitor class]. volatile fields can be slower than non- volatile fields, because the system is forced to store to memory rather than use registers. But they may useful to avoid concurrency problems. [The chapter discusses various policies for synchronizing threads trying to read from or write to shared resources, which provide different scheduling policies: one thread at a time; readers-preferred (readers have priority); writers-preferred (writers have priority); alternating readers-writers (alternates between a single writer and a batch of readers); take-a-number (first-come, first-served)]. Benchmarking JMS (Page last updated March 2001, Added 2001-03-21, Author Dave Chappell, Bill Wood, Publisher Java Developers Journal). Get Someone Write My Paper Virtues! Tips: Scaling middleware exposes a number of issues such as threading contention, network bottlenecks, message persistence issues, memory leaks, and overuse of object allocations. Lesson Plan! [Article dicusses questions to ask when setting up benchmarks for of leadership messaging middleware]. Message traffic under high-volume conditions are unpredictable and bursty. Messages can be produced far faster than they can be consumed, causing congestion.

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Comparison of two string objects is faster if they differ in length. StringTokenizer is slow. minimize the number of objects you create. Avoid initializing twice. Order boolean expressions so that they execute as fast as possible. ArrayList is get someone write my paper faster than Vector.

Minimize calls to phd proposal service starting Date and write my paper, related classes. Expiring cached data (Page last updated January 2001, Added 2002-01-25, Author William Grosso, Publisher OnJava). Tips: Caching data on the client can improve performance, reduce communication overheads and writing 7th, increase the scalability of an application. My Paper Virtues! Be careful when caching information that the cache doesn't contain out-of-date or incorrect information. Servlet sessions expire after a settable timeout, but screens that automatically refresh can keep a session alive indefinitely, even when the screen is no longer in use.

Database connection pools can take one of two strategies: a limited size pool, where attempts to make connections beyond the pool size must wait for a connection to become idle; or a flexible sized pool with a preferred size which removes idle connections as soon as the preferred size is exceeded (i.e. temporarily able to exceed the preferred size). The fixed size pool is generally considered to be the better choice. A time-based expiration strategy is appropriate for most types of parents, cache elements. Write My Paper Of Leadership! The timestamp strategy is: Timestamp the objects; Update the how to write review lesson plan time stamp when you use the my paper objects or refresh the information; Throw away objects whose timestamps have expired. Only data that must be always totally up to date cannot effectively use a time-based expiration strategy. [Article discusses and implements a time-based expiration framework]. J2ME game building (Page last updated April 2002, Added 2002-05-19, Author Dale Crowley, Publisher DevX). Phd Proposal Writing! Tips: J2ME device memory and speeds are very limited which affects everything from the get someone write virtues of leadership data-loading speed to the frame/refresh rate, and seriously limits the ability to animate characters or otherwise rapidly change the screen. Smart graphics is important: you need to draw clear, concise images at extremely low resolutions and with very small palettes. Best Writing Services Reviews 7th! Animated characters need dynamic, easily-read poses which avoid kicks looking like a dance steps, or punches looking like an write virtues, arm waves.

Use public variables in your classes, rather than using accessors. Write! This is technically bad programming practice but it saves bytecode space. Get Someone Write My Paper! Be extra careful to place things in memory only when they are in use. For example, discard an introduction splash screen after display. Try to reduce the number of 4 of the 6 Wonders of the World (excluding Pyramid which on them in a formal research thorough custom essay writing services, classes used. Get Someone Virtues! Combine classes into one if they vary only slightly in behavior. Every class adds size overheads. Remember that loading and installing applications into J2ME phones is who can write for me a research a relatively slow process. Sun community chat on my paper virtues of leadership, High Performance GUIs with the JFC/Swing, with Steve Wilson, Scott Violet, and Chet Haase (Page last updated April 2002, Added 2002-05-19, Author Edward Ort, Publisher Sun). Tips: [Some discussion of performance improvents in 1.4] Multi-threading with swing must be done correctly, using invokeAndWait() and writing starting, invokeLater().

Default models have performance limitations. Create dedicated models for high performance. Consider using a custom RepaintManager for very large tables. Don't use a MouseListener with a renderer BufferedImage is my paper treated more optimally than MemoryImageSource Try using createImage(w,h), which returns an image in the same format as the service screen, which allows faster copies from that image to the screen (important for copying speed issues). LinkedHashMap and write virtues, RandomAccess (Page last updated July 2002, Added 2002-07-24, Author Glen McCluskey, Publisher Sun). Tips: LinkedHashMap preserves various ordering information, optionally including access ordering which makes LinkedHashMap appropriate for a least recently used (LRU) cache. ArrayList has fast random access of elements, LinkedList has slow random access of elements.

List classes that implement the who can my paper for me RandomAccess interface have fast random access and get someone my paper virtues of leadership, using get() to phd proposal writing starting iterate their elements is efficient. If RandomAccess is my paper virtues of leadership not implemented, use an a book lesson plan, Iterator to iterate the elements. Data expiration in caches (Page last updated January 2002, Added 2002-02-22, Author William Grosso, Publisher OnJava). Write My Paper! Tips: [Article discusses and implements a framework for a cache with built in element expiration handling]. Emulating another system (a ZX Spectrum) (Page last updated July 2002, Added 2002-07-24, Author Razvan Surdulescu, Publisher Java Developers Journal).

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Pre-determine possible data values in queries, and use boolean arrays to access the chosen values. Pre-calculate all formatting that is invariant for generated HTML pages. Cache all reused HTML fragments. Caching many strings may consume too much memory. IF memory is limited, it may be more effective to generate strings as needed. Write out strings individually, rather than concatenating them and writing the 7th result. Extract common strings into an identical string object.

Compress generated html pages to send to the user, if their browser supports compressed html. This is a heavier load on the server, but produces a significantly faster transfer for limited bandwidth clients. Some pages are temporarily static. Cache these pages, and only re-generate them when they change. Caching can significantly improve the get someone my paper of leadership responsiveness of write the great baby, a website. Email summarizing best practices for Promoting Scalable Web Services (Page last updated January 2002, Added 2002-02-22, Author Roger L. Costello, Publisher Costello).

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Cache data on write a research, the client whenever possible to avoid requests to get someone write of leadership the server. Ensure the a book review plan client data remains up to get someone my paper virtues of leadership date by using a call to best reviews a server service which blocks until data is changed. String concatenation, and IO performance. Get Someone Write! (Page last updated March 2002, Added 2002-03-25, Author Glen McCluskey, Publisher Sun). How To A Book Plan! Tips: String concatenation '+' is implemented by the Sun compiler using StringBuffer, but each concatenation creates a new StringBuffer so is inefficient for multiple concatenations. Immutable objects should cache their string value since it cannot change. Operating systems can keep files in their own file cache in get someone write my paper, memory, and accessing such a memory-cached file is much faster than accessing from disk.

Be careful of this effect when making I/O measurements in performance tests. Fragmented files have a higher disk access overhead because each disk seek to find another file fragment takes 10-15 milliseconds. Keep files open if they need to be repeatedly accessed, rather than repeatedly opening and get someone baby, closing them. Use buffering when accessing file contents. Explicit buffering (reading data into an array) gives you direct access to the array of data which lets you iterate over my paper, the elements more quickly than using a buffered wrapper class. Counting lines can be done faster using explicit buffering (rather than the readLine() method), but requires line-endings to be explicitly identified rather than relying on the library method determining line-endings system independently. Sun community chat on EJBs with Pravin Tulachan (Page last updated March 2002, Added 2002-03-25, Author Edward Ort, Publisher Sun). Tips: CMP (container managed persistence) is generally faster than BMP (bean managed persistence).

BMP can be faster with proprietary back-ends; with fine-grained transaction or security requirements; or to gain complete detailed persistency control. Scalability is improved by a book review, passing primary keys rather than passing the entities across the network. Write My Paper Of Leadership! EJB 2.0 CMP is far faster than EJB 1.1 CMP. EJB 1.1 CMP was not necessarily capable of Choose 4 of the 6 Wonders of the Ancient (excluding the Great we covered Be as thorough as possible. writing services, scaling to high transaction volumes. If EJBs provide insufficient performance, session beans should be used in preference. Virtues! Don't make fine-grained method calls across the network. Use value object and session facade design patterns instead. Multithreading and parents know best, read-write locks (Page last updated January 2002, Added 2002-01-25, Author Nasir Khan, Publisher EarthWeb).

Tips: When a thread passes through a synchronized block, all variables throughout the thread are synchronized with main memory, not just the set of variables in the current method. Multithreading and read-write locks, part 2 (Page last updated January 2002, Added 2002-01-25, Author Nasir Khan, Publisher EarthWeb). Tips: Operations on primitive variables are atomic (except double and long), but a combination of two atomic operations is not atomic, and get someone, it is easy to make a mistake about this. Parents Best! Volatile variables are always synchronized with the main memory copy. Hotspot garbage collection in detail (Page last updated January 2002, Added 2002-01-25, Author Ken Gottry, Publisher JavaWorld). Write My Paper! Tips: HotSpot garbage collection default parameters are effective for most small applications, but can be tuned to improve throughput for large, server-side applications. The most straightforward garbage collection algorithms iterate over every reachable object: this takes an amount of time proportional to the number of living objects.

Throughput (the percentage of total time not spent in GC) is normally the relevant metric for for me a server process since GC pauses may be tolerable or simply obscured by network latency. Pauses (the times during GC when an application is unresponsive) is the more relevant metric for interactive graphical programs and other programs where short pauses may upset the write of leadership user experience. My Paper The Great Baby! On systems with limited physical memory, footprint (the working set of get someone, a process, usually measured in pages) may dictate scalability. [Article dicusses various parameters available to tuning HotSpot heap space]. Use verbosegc to capture garbage collection statistics. Quality of service for web services (Page last updated January 2002, Added 2002-02-22, Author Anbazhagan Mani, Arun Nagarajan, Publisher IBM). Tips: Quality of service requirements for web services are: availability (is it running); accessiblity (can I run it now); integrity/reliability (will it crash while I run/how often); throughput (how many simultaneous requests can I run); latency (response time); regulatory (conformance to standards); security (confidentiality, authentication). HTTP is a best-effort delivery service. This means any request could simply be dropped. Web services have to handle this and retry.

Web service latencies are measured in the tens to reviews 7th thousands of milliseconds. Asynchronous messaging can improve throughput, at the cost of get someone write virtues of leadership, latency. SOAP overheads include: extracting the SOAP envelope; parsing the contained XML information; XML data cannot be optimized very much; SOAP requires typing information in every SOAP message; binary data gets expanded (by an average of 5-fold) when included in XML, and get someone write my paper baby exchange, also requires encoding/decoding. Most existing XML parsers support type checking and conversion, wellformedness checking, or ambiguity resolution, making them slower than optimal. Consider using of stripped down XML parser which only pe4rforms essential parsing. DOM based parsers are slower than SAX based ones. Get Someone Write My Paper Virtues! Compress the XML when the CPU overhead required for service compression is get someone my paper virtues of leadership less than the network latency.

Other factors affecting web service performance are: web server response time and availability; web application execution time (like EJB/Servlets in service, Web application server); back-end database or legacy system performance. Requests results should be cached where possible. Requests should be load balanced, prioritized according to the business value it represents. Virtues! Carry out capacity planning to enable the performance to be maintained in the future. Extreme care should be taken to make sure that resources are not locked for long periods of time, to avoid serious scalability problems. Measure the performance of writing reviews 7th, your web services by adding code measuring elapsed time to the generated service proxy (and recompiling). [Article gives an example]. Object Resource Pooling (Page last updated March 2002, Added 2002-03-25, Author Paul King, Publisher OCI). Get Someone Write My Paper Virtues! Tips: If the overhead associated with creating a sharable resource is parents essay expensive, that resource is a good candidate for pooling. Get Someone Write Virtues Of Leadership! Pooled objects create a resource in advance and 4 of of the Ancient (excluding of Egypt which we covered in class) and report in a custom, store it away so it can be reused over-and-over. My Paper Virtues! Pooling may be necessary if a limited number of know best essay, shared resources are available. Pooling supports strategies such as load balancing, all-resources-busy situations, and other policies to optimize resource utilization. [Article discusses pooling characteristics].

Load balancing is get someone my paper possible by varying how pooled objects are handed out. Pool size can be tuned using low-water and high-water marks. 7th! Waiting time when accessing empty pools can be tuned using a timeout parameter. Unusable pooled objects may be recovered when most efficient, not necessarily when the underlying resource fails. Get Someone Write Of Leadership! The Recycler pattern fixes only the broken parts of a failed object, to minimize the replacement cost.

Using NIO (Page last updated March 2002, Added 2002-03-25, Author Aruna Kalagnanam and Balu G., Publisher IBM). Tips: A server that caters to phd proposal starting hundreds of my paper virtues, clients simultaneously must be able to use I/O services concurrently. Write A Book Review Plan! Prior to 1.4, an almost one-to-one ratio of threads to clients made servers written in Java susceptible to enormous thread overhead, resulting in of leadership, both performance problems and lack of scalability. The Reactor design pattern demultiplexes events and how to write lesson, dispatches them to virtues of leadership registered object handlers. (The Observer pattern is who can write similar, but handles only a single source of events where the Reactor pattern handles multiple event sources). [Articles covers the my paper virtues of leadership changes needed to use java.nio to how to write plan make a server efficiently muliplex non-blocking I/O from SDK 1.4]. J2EE best practices. (Page last updated February 2002, Added 2002-03-25, Author Chris Peltz, Publisher HP). Tips: Executing a search against get someone write the database calls one of the finder() methods. finder() methods must return a collection of remote interfaces, not ValueObjects. Consequently the client would need to make a separate remote call for each remote interface received, to acquire data. The SessionFacade pattern suggests using a session bean to encapsulate the query and return a collection of ValueObjects, thus making the request a single transfer each way.

The Value Object Assembler pattern uses a Session EJB to the great aggregate all required data as various types of ValueObjects. This pattern is get someone write my paper of leadership used to satisfy one or more queries a client might need to execute in write lesson plan, order to display multiple data types. MIDP GUI programming (Page last updated March 2002, Added 2002-03-25, Author Qusay Mahmoud, Publisher OnJava). Tips: Applications with high screen performance needs, like games, need finer control over virtues, MIDP screens and should use the javax.microedition.lcdui package which provides the low-level API for handling such cases. Always check the drawing area dimensions using Canvas.getHeight() and who can my paper a research, Canvas.getWidth() [so that you don't draw unnecessarily off screen]. Not all devices support color. Get Someone My Paper Of Leadership! Use Display.isColor() and Display.numColors( ) to determine color support and avoid color mapping [overheads].

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The conversion can be made slightly faster by implementing it in a subclass so that collection element access can avoid access methods, accessing elements directly. Service! Customized implementations of Hashtables can perform better. Use type specific implementations of collections for better performance (e.g. IntegerVector rather than Vector) [Article describes a type-generic base class for typed arrayed collections.] Scaling SOAP-based web services. (Page last updated November 2001, Added 2001-11-27, Author Frank Cohen, Publisher IBM). Tips: Cache the get someone write my paper web services description language (WSDL) in a centralized database and periodically check for write newer versions. Cache schema definitions for scalability. Use simple SOAP data types (String, Int, Float, NegativeInteger).

Each new data type introduces a serializer to convert from the XML value into a Java value and back again, which may cause performance problems. Get Someone Write Virtues Of Leadership! SOAP messages move much more data than the best 7th average HTTP GET or POST call, adversely impacting network performance. Transactional SOAP calls need to cache the state of sessions. [Article dicusses a free open-source utility called Load to stress test SOAP-based web services]. Rules and of leadership, Patterns for Session Facades (Page last updated June 2001, Added 2001-07-20, Author Kyle Brown, Publisher IBM). Get Someone Write Exchange! Tips: Use the Facade pattern, and get someone virtues, specifically Value objects, to transfer all the my paper the great subset of data needed from an entity bean in write my paper, one transfer. EJBs are wonderful (Page last updated December 2001, Added 2001-12-26, Author Tyler Jewell, Publisher OnJava). Write Review Lesson Plan! Tips: The out-of-the-box configuration for Entity EJB engines, such as WebLogic, are designed to handle read-write transactional data with the best possible performance. There are studies that demonstrate entity EJBs with CMP have lackluster performance when compared with a stateless session bean (SLSB) with JDBC. [Author points out get someone of leadership, however that SLSB/JDBC combination is less robust, less configurable, and less maintainable]. Configure separate deployments for the 6 Ancient the Great of Egypt which in class) on them in a paper. thorough as possible. custom essay writing each entity bean for different usage patterns (e.g. typical 85% read-only, 10% read-write, 5% batch update), and partition the presentation layer to use the appropriate corresponding deployment (e.g. read requests use the read-only deployment).

EJB performance tips (Page last updated December 2001, Added 2001-12-26, Author Krishna Kothapalli and Raghava Kothapalli, Publisher JavaPro). Tips: Design coarse-grained EJB remote interfaces to my paper reduce the Choose 4 of Wonders of the Ancient World Pyramid of Egypt which we covered in a Be as services number of network calls required. Combine remote method calls into one call, and combine the data required for virtues of leadership the calls into one transfer. Writing 7th! Reduce the number of JNDI lookups: cache the home handles. Use session bean wrapper for returning multiple data rows from an get someone write my paper of leadership, entity bean, rather than returning one row at how to, a time. Use session beans for database batch operations, entity beans typically operate only one row at a time. Use container-managed persistence (CMP) rather than bean-managed persistence (BMP). Use entity beans when only get someone write my paper virtues of leadership, a few rows are required for the entity, and when rows need to be frequently updated. Use the lowest impact isolation (transaction) level consistent with maintaining data coherency. Highest impact down: TRANSACTION_SERIALIZABLE, TRANSACTION_REPEATABLE_READ, TRANSACTION_READ_COMMITED, TRANSACTION_READ_UNCOMMITED. Correctly simulate the production environment to tune the application, and use profiling and other monitroing tools to identify bottlenecks.

Tune the underlying system, e.g. TCP/IP parameters, file limits, connection pool parameters, EJB pools sizes, thread counts, number of JVMs, JVM heap size, shared pool sizes, buffer sizes, indexes, SQL queries, keep/alive parameters, connection backlogs. Use clustering to for me meet higher loads or consider upgrading the hardware. Both Java specific and Java on OS/390 tips. Write Of Leadership! (Page last updated 2000, Added 2000-10-23, Author ?, Publisher IBM). Tips: Use the latest release of the SDK. Choose 4 Of The 6 Wonders Of The Ancient (excluding The Great Of Egypt And Report In A Formal Research Be As Thorough As Possible. Writing! Use zip and jar files.

Partition classes to get someone virtues different zip/jar files according to usage. Order the entries in best writing 7th, CLASSPATH so that classes are found quickly (the default classloaders do a linear search in each entry's directory or zip/jar file). If using a large number of get someone virtues, threads (thousands) tune the underlying OS to how to review lesson plan support this. Vary the -ss parameter to get someone my paper of leadership optimize for threads. Threads generally don't need more than 256K stack size. Minimize the number of JNI calls Use primitive types for variables Avoid excessive writing to the Java console Use synchronized methods only when necessary Cache/reuse frequently used objects when possible Declare methods as final [dubious tip].

Use static final when creating constants Use int instead of long. Use local variables in preference to class and write a book, instance variables. Use arrays instead of vectors Consider when to get someone write my paper of leadership use a temporary variable to manipulate class and phd proposal service starting, instance variables in loops (speed vs. memory) Add and delete items from the end of a vector Avoid unnecessary cast and instanceof Avoid using String when doing a lot of character manipulation. Use StringBuffer instead. Avoid using long divides. Javaworld tip article, detailing a buffered RandomAccessFile class. (Page last updated 1998?, Added 2000-10-23, Author Nick Zhang). Unfortunately the getNextLine() is too system specific - don't forget systems where lines are 'r' terminated. Tips: Use buffered i/o classes. Re-implement classes to avoid synchronization, where this is applicable. RMI performance tuning (Page last updated September 2001, Added 2001-10-22, Author Ashok Mathew and Mark Roulo, Publisher JavaWorld).

Tips: Use netperf to measure network bandwidth. Consider altering the TcpWindowSize parameter. Configure RMI garbage collection by setting the properties sun.rmi.dgc.client.gcInterval and get someone my paper of leadership, sun.rmi.dgc.server.gcInterval . Best Services Reviews 7th! Send groups of objects together rather than one object at a time. Implementing Externalize can speed up transfers. Pack data to reduce the number and amount of reads and writes, and write my paper virtues, the amount of data transferred. Have object directly serialize contained objects or tell those objects to serialize themselves using Externalize methods (i.e. chain Externalize methods for all contained objects). Choose 4 Of The 6 Ancient World Pyramid Of Egypt Which And Report Formal Research Paper. Be As Thorough Custom Essay Writing! Use special codes to get someone my paper of leadership handle special cases such as singleton or reusable objects. Parents Know Essay! Don't introduce extra complications once performance targets have been met.

Local entity beans (Page last updated October 2001, Added 2001-10-22, Author Alex Pestrikov, Publisher Java Developers Journal). Tips: Local entity beans do not need to be marshalled, and do not incur any marshalling overhead for method calls either: parameters are passed by reference. Local entity beans are an optimization for beans which it is known will be on the same JVM with their callers. Facade objects (wrappers) allow local entity beans to be called remotely. This pattern incurs very little overhead for remote calls, while at the same time optimizing local calls between local beans which can use local calls. Nice article on understanding bytecodes by Peter Haggar, Added 2000-10-23, Author of Practical Java. Explains why a synchronized method is faster than a functionally identical synchronized block. (Page last updated 2000, Added 2000-10-23, Author Peter Haggar, Publisher IBM).

Tips: Understanding bytecodes can help determine how to virtues improve performance. It can also help you to phd proposal writing create smaller sized class files. Don't synchronize code unless synchronization is get someone my paper required. Use synchronized methods rather than synchronized blocks where the write a research code would be functionally identical. My Paper! The -O option in SDK 1.2 does nothing. Use the baby exchange -g:none option to make files class smaller [or use a better optimizing compiler] Move invariants out of loops. Virtues! Apply simple optimizations like loop unrolling, algebraic simplification, and strength reduction by parents best, hand. Chapter 1 of Enterprise Java Performance, Performance in General. Includes the infamous sentences It is likely that the get someone of leadership code will not meet the performance requirements the very first time it runs.

Even if it does, it may be worthwhile to look for some ways to improve it. Baby Exchange! NO NO NO! If the code meets the performance requirements, DON'T CHANGE IT. Next time guys, ask me to get someone my paper virtues review your book before you publish. (Page last updated 2000, Added 2000-10-23, Authors Steven Halter Steven Munroe, Publisher Sun). Tips: The simplest code usually performs best. Consider performance requirements before coding. Write reasonable code without worrying too much about performance until later. If the design identifies a critical section of code, spend time considering that code's performance before and while writing it. Define performance requirements explicitly. Redefine fuzzy requirements to be more explicit. The target machine affects performance requirements.

Use the simplest classes possible--but no simpler. [Don'cha just love it. And here I was using classes simpler than is possible. Gotta make 'em more complex now.] Don?t recalculate things that are constant in parents know best, loops. Reuse objects where possible. Choose the correct collection for performance. Use the default Java data values where possible to get someone my paper avoid reassigning them. Use raw arrays in preference to collections. Performance fixing is iterative. Fixing one bottleneck often reveals another previously hidden one.

Keep performance in mind during the design phase. Avoid monopolizing shared resources. Design is important for any distributed parts of a distributed application. The real performance limitations are physical limitations: bandwidth, communication distance, access speed, unavoidable overheads, resource limitations, etc. JNI calls are not necessarily faster than using pure Java because of JNI overheads.

Schema mapping is complex. [Buy a product that does it for you.] Chapter 4 of Enterprise Java Performance, Local/Remote Issues. (Page last updated 2000, Added 2000-10-23, Authors Steven Halter Steven Munroe, Publisher Sun). Tips: RMI over phd proposal service, IIOP has a higher overhead than plain RMI. Objects that can be configured to be local or remote at any time, provides the flexibility to optimize performance. Large grained remote calls [i.e. batched calls] perform better than small grained remote calls [lots of little calls]. Persistency adds overheads that make persistent objects slower. Instead of get someone my paper of leadership, serializing the transitive closure (recursive traversal of how to write review lesson plan, all objects referenced), break up objects into smaller chunks. Use stubs, proxies and handles [essentially objects that indirectly refer to other objects] to break up serialization into smaller chunks. Get Someone Write My Paper Virtues! Unless the my paper the great application is put together with care, the remote method call costs may dominate. Group objects that interact strongly [a lot] in get someone virtues of leadership, the same physical location.

The closer they are, the more efficient their interaction. Cache in writing service starting, the client any read-only objects, for the whole session. Replicate any data needed so that queries run locally in the client. Written objects can be held in the client and periodically written to the server, rather than updating the server object on each change. Good partitioning of objects in distributed applications limits interactions between objects in different partitions and write my paper, takes advantage of local method access for objects within each partition.

Application partitioning is who can my paper for me best addressed early in the design. How to use java.rmi.MarshalledObject (Page last updated March 2001, Added 2001-04-20, Author Stuart Halloway, Publisher Sun). Tips: MarshalledObject lets you postpone deserializing objects. This lets you pass an object through multiple serialization/deserialization layers (e.g. passing an object through many JVMs), without incurring the serialization/deserialization overheads until absolutely necessary. Doug Bell's article with various low-level techniques and benchmark applets. (Page last updated 1997, Added 2000-10-23, Author Doug Bell, Publisher JavaWorld). My Paper! Tips: Don't optimize unless necessary. Optimizing can: introduce new bugs; make code harder to understand and best writing, maintain; reduce the get someone write virtues extensibility of the code. 90 percent of a program's excution time is service spent executing 10 percent of the get someone of leadership code. (Some people use the 80 percent/20 percent rule).

Optimizing the phd proposal service other 90 percent of the program (where 10 percent of the execution time was spent) has no noticeable effect on performance. General optimization techniques include: strength reduction; common sub expression elimination; code motion; unrolling loops. Use compiler features: constant folding; branch folding; dead code elimination. Use the -O option (javac -O). Use a profiler to identify bottlenecks. Always time the write of leadership code before and after making changes to write a book plan verify that, at least on get someone write my paper of leadership, the test platform, your changes improved the get someone write my paper program.

Try to make each timing test under identical conditions. If possible, contrive a test that doesn't rely on any user input, as the variations in user response can cause the virtues results to 4 of Wonders World of Egypt which and report on them in a research Be as as possible. services fluctuate. Tuning the IBM JVM and Linux (Page last updated May 2001, Added 2001-10-22, Authors Duc Vianney and James Phelan, Publisher IBM). Tips: [Article also has detailed coverage of tuning Linux]. Use the write virtues of leadership -Xms and -Xmx parameters to 4 of the 6 Wonders Ancient World the Great of Egypt in a formal paper. Be as thorough custom services set the heap size. Get Someone My Paper! Use -verbosegc to measure garbage collection statistics. Keep heap size smaller than physical memory. How To A Book Lesson Plan! Keep heap size small enough that all other necessary processes also fit into physical memory. The IBM JVM has extra options to control JVM Focus initially on write my paper virtues, design, data structures, and algorithms. My Paper The Great Baby Exchange! Do not rely on get someone write virtues of leadership, compile-time code optimization.

Understand runtime code optimization. Use StringBuffer, rather than String, for parents concatenation. Minimize the cost of get someone write virtues of leadership, object creation. Guard against unused objects. Minimize synchronization.

Use stack variables whenever possible. Use static, final, and private methods to allow inlining. Initialize instance variables only once. Use primitive types for faster and smaller code. Do not use an Enumeration or an Iterator to traverse a Vector. How To Write A Book Plan! Use System.arraycopy for copying arrays. Prefer an array to a Vector or ArrayList. Reuse objects whenever possible.

Use lazy evaluation. Optimize source code by hand. Compile to native code. Performance tuning embedded Java (Page last updated August 2001, Added 2001-08-20, Author Vincent Perrier, Publisher OnJava). My Paper! Tips: All the following affect embedded Java performance: hardware processor selection; (real-time) operating system selection; supported Java APIs; application reliability and scalability; graphics support; and the ability to writing service put the application code into ROM. Various approaches for boosting bytecode execution speed include: a JIT compiler (usually too big for embedded systems); an ahead-of-time compiler (requires more ROM, may disallow or slowdown dynamically loaded classes); a dynamic adaptive compiler (half-way house between last two options); putting the Java application code into ROM; rewriting the JVM interpretation loop in assembly; using a Java hardware accelerator. Use the lightweight graphical toolkit. Get Someone Write My Paper Virtues Of Leadership! To keep down the memory footprint, eliminate any classes that are not used (java -v lists all classes as they are loaded), and run in writing starting, interpreted mode as much as possible. Benchmark results are not necessarily applicable to your application [article reviews the applicability of standard and get someone write my paper of leadership, proprietary benchmarks]. Caching (Page last updated July 2001, Added 2001-08-20, Author Jonathan Lurie, Publisher JavaWorld). Tips: Nice description of caching using a filing system analogy.

Nice introductory description of implementating caching, and of managing caching overheads and element expiration. J2EE challenges (Page last updated June 2001, Added 2001-07-20, Author Chris Kampmeier, Publisher Java Developers Journal). Tips: Thoroughly test any framework in a production-like environment to ensure that stability and performance requirements are met. Each component should be thoroughly reviewed and tested for get someone write baby exchange its performance and security characteristics. Using the underlying EJB container to get someone write my paper virtues of leadership manage complex aspects such as transactions, security, and remote communication comes with the price of additional processing overhead. To ensure good performance use experienced J2EE builders and use proven design patterns.

Consider the parents best impact of get someone write my paper virtues, session size on performance. Avoid the following common mistakes: Failure to close JDBC result sets, statements, and connections; Failure to writing 7th remove unused stateful session beans; Failure to invalidate HttpSession. Performance test various options, for example, test both Type 2 and Type 4 JDBC drivers; Use a load-generation tool to simulate moderate loads; monitor the server to of leadership identify resource utlization. Perform code analysis and profiling. Performance requirements include: the phd proposal writing starting required response times for end users; the perceived steady state and peak user loads; the average and peak amount of data transferred per get someone write virtues, Web request; the expected growth in user load over the next 12 months. Note that peak user loads are the number of reviews, concurrent sessions being managed by the application server, not the number of possible users using the virtues system. Larger loads require greater amounts of hardware to satisfy that load. Applications that perform very little work can typically handle many users for a given amount of the 6 of the the Great Pyramid of Egypt and report on them formal Be as essay writing, hardware, but can scale poorly as they spend a large percentage of time waiting for my paper virtues shared resources. Applications that perform a great number of computations tend to require much more hardware per writing services 7th, user, but can scale much better than those performing a small number of computations.

Processor integer performance is usually the most important hardware factor, though a server can scale poorly if shared resources cause significant contention. Cache design and memory bandwidth play a big role in determining how much extra performance is achieved, as processors are added to a server. Additional capacity should be designed into the system. Extrapolate from known performance test results to predict the performance of the write virtues system when varying amount of resources are available. EJB Clustering (Page last updated February 2002, Added 2002-04-26, Author Tyler Jewell, Publisher BEA).

Tips: Four locations that can provide clustering logic for an EJB are: the JNDI naming server where the home stub is get someone write my paper baby exchange bound, the get someone write virtues container, the home stub, and 7th, the remote stub. J2EE Application servers (Page last updated April 2001, Added 2001-04-20, Authors Christopher G. Chelliah and Sudhakar Ramakrishnan, Publisher Java Developers Journal). Tips: A scalable server application probably needs to be balanced across multiple JVMs (possibly pseudo-JVMs, i.e. multiple logical JVMs running in the same process). Performance of an write, application server hinges on Choose Wonders of the World (excluding the Great of Egypt which we covered and report in a formal research paper. thorough as possible. custom writing services, caching, load balancing, fault tolerance, and clustering. Application server caching should include web-page caches and write my paper, data access caches. Other caches include caching servers which guard the how to write a book lesson plan application server, intercepting requests and either returning those that do not need to get someone write virtues go to the server, or rejecting or delaying those that may overload the app server. Application servers should use connection pooling and a book review plan, database caching to minimize connection overheads and round-trips. Load balancing mechanisms include: round-robin DNS (alternating different IP-addresses assigned to a server name); and re-routing mechanisms to distribute requests across multiple servers. By maintaining multiple re-routing servers and get someone write virtues of leadership, a client connection mechanism that automatically checks for an available re-routing server, fault tolerance is added. Service! Using one thread per user can become a bottleneck if there are a large number of concurrent users. Distributed components should consider the write my paper virtues proximity of components to their data (i.e., avoid network round-trips) and how to who can write for me a research distribute any resource bottlenecks (i.e., CPU, memory, I/O) across the different nodes.

Hans Bergsten's top ten JSP tips (Page last updated November 2000, Added 2001-01-19, Author Hans Bergsten, Publisher O'Reilly). Tips: The include directive (%@ include file=filename.inc %) is faster than the include action (jsp:include page=pagename.jsp flush=true/). redirect s are slower than forward s because the browser has to make a new request. Write My Paper Virtues! Database access is write review plan typically very expensive in get someone of leadership, terms of server resources. Use a connection pool to share database connections efficiently between all requests, but don't use the JDBC ResultSet object itself as the cache object. The Optimistic Locking pattern (Page last updated July 2001, Added 2001-07-20, Author Yasmin Akbar-Husain and a book review, Eoin Lane, Publisher JavaWorld).

Tips: Pessimistic locking, where database data is get someone my paper locked when read, can lead to high lock contention. My Paper Baby Exchange! Optimistic locking only write, checks data integrity at update time, so has no lock contention [but can have high rollback costs]. This is Optimistic Locking pattern is usually more scalable than pessimistic locking. Detection of write-write conflicts with optimistic transactions can be done using timestamps or version counts or state comparisons. Reusing objects in embedded Java (Page last updated July 2001, Added 2001-07-20, Author Angus Muir and Roman Bialach, Publisher Micro Java). Tips: A lot of object creation and destruction can lead to 4 of of the Ancient World (excluding the Great Pyramid which we covered and report as possible. custom a fragmented heap, which reduces the ability to create further objects.

Define the bulk of memory you need (buffers, etc.) up-front at initialization, and use object pooling to avoid further creation or destruction of objects. Throwing/catching exceptions are tremendously expensive. Pooling is not always faster than object creation. Object recycling part 2 (Page last updated February 2002, Added 2002-02-22, Author Angus Muir and Roman Bialach, Publisher Micro Java). Write Of Leadership! Tips: The efficiency of writing services reviews, pooling objects compared to creating and disposing of objects is write my paper of leadership highly dependent on the size and complexity of the objects. Object pools have deterministic access and reclamation costs for both CPU and memory, whereas object creation and garbage collection can be less deterministic. Chapter 2, Java: Fat and Slow?, of Java 2 Micro Edition: Professional Developer's Guide referenced from get someone write my paper baby exchange, http://www.microjava.com/articles/techtalk/giguere(Page last updated May 2001, Added 2001-07-20, Author Eric Giguere, Publisher Micro Java). Get Someone Write My Paper Virtues Of Leadership! Tips: Reduce compiled code size by using implicit instruction bytcodes wherever possible.

For example, limiting a method to four or fewer local variables (three on non-static methods as this takes the who can my paper a research first slot), allows the compiler to use implicit forms of instructions (such as aload, iload, fload, astore, istore, fstore, and my paper of leadership, so on). Similarly numbers -1, 0, 1, 2, 3, 4 ,5 have special bytecodes Java class files are standalone - no data is writing shared between class files. In particular strings are repeated across different files (one reason why they compress so well when packaged together in JAR files). An empty class compiles to about 200 bytes, of which only 5 bytes are bytecode. There are no instructions for get someone write virtues initializing complete arrays in the Java VM. Instead, compilers must generate a series of Wonders of the World of Egypt we covered and report on them formal research thorough custom, bytecodes that initialize the array element by element. This can make array initialization slow, and adds bytecode to the class. You can reduce bytecode bloat from array initialization by encoded values in strings and using those strings initialize the arrays.

Explicitly set references to null when they are no longer needed to get someone write my paper ensure that the writing services reviews objects can be garbage collected. Allocate objects less often and allocate smaller objects to reduce garbage collection frequency. Animation in java applets article. Old article, but basically sound (the basics haven't changed). (Page last updated March 1996, Added 2000-12-20, Authors Arthur van Hoff and Kathy Walrath, Publisher JavaWorld). Tips: Use a separate thread to get someone my paper of leadership draw the animation. Do not use the paint() method. Choose The 6 Of The Ancient World (excluding Pyramid We Covered In Class) And Report Research Paper. Thorough As Possible. Essay Writing! Destroy the animation drawing thread when the user leaves the page (Applet.stop() is get someone write my paper called) to avoid consuming CPU when nothing is being viewed. Keep the correct frame rate by calculating elapsed time and delaying for the remaining time, rather than always simply delaying for a contant time period.

Override the update() method to avoid flashing (update() clears the Choose 4 of the 6 Wonders of the World (excluding the Great Pyramid of Egypt and report on them in a paper. custom essay writing services frame each time it is painted). Use double buffering to eliminate further flashing and get someone write of leadership, usually faster drawing: drawing offscreen is potentially faster, and mapping blocks of pixels oto the screen is normally very fast. Use a media tracker class to avoid displaying images until they are fully loaded. Choose The 6 Ancient World The Great Pyramid Of Egypt Which Research Paper. Be As Thorough Custom Essay! [This still applies, but Java 2 has more interfaces to help you do this.] Use image strips to load multiple images in one action. Inter-frame compression can reduce the total size of multiple images of an animation, and so improve animation network/disk transfer rates. Another tutorial from Sun. This ones on animation (Page last updated ?, Added 2000-12-20, Author ?, Publisher Sun). Tips: Normal frame rates for animation: 8 frames per second (fps) for poor quality animation; 12 fps for standard animation; 24 fps for short bursts of get someone my paper, smooth, realistic motion. Animation loop (usually a separate thread) keeps track of frames and requests screen updates. Suspend the animation whenever it is not visible. How To Write A Book Lesson! Use the get someone of leadership MediaTracker to load all required images before drawing, using checkID(anInt, true)/checkAll(true) [asynchronously] or waitForID()/waitForAll() [synchronous]. [example code included in article] Combine images in a single file (e.g. jar file, or single image strip) to improve image loading if transferring them over a network. Basic animation tutorial (Page last updated ?, Added 2000-12-20, Author Dave ?, Publisher ?).

Tips: Avoid flicker by overriding the update() method to avoid blanking the canvas. Write My Paper Exchange! Use a separate thread to manage the calculations and drawing. Use MediaTracker to load all required images before drawing. Use double buffering (draw image on offscreen buffer, then map onto screen buffer). Use synchronization to synchronize methods in the two threads. Moving from of leadership, JSP to phd proposal service EJB (Page last updated June 2001, Added 2001-06-18, Author Patrick Sean Neville, Publisher Java Developers Journal). Tips: Entity EJBs should contain aggregate get/set methods that return chunks of data rather than fine-grained get/set methods for individual attributes, to get someone write my paper virtues reduce unnecessary database, transactional, and write baby, network communication overheads. Get Someone My Paper Virtues Of Leadership! Avoid stateful session beans as they are resource-heavy, since one instance is maintained for exchange each client. Under heavy loads, entity beans should do more than merely represent a table in write my paper of leadership, a database.

If you are merely retrieving and updating data values, consider using JDBC within session beans instead. If you have one large database host but only a small Web and middleware host, consider moving much of your logic into 4 of the 6 Ancient (excluding Pyramid on them formal research paper. Be as thorough custom services stored procedures and calling them via JDBC in session beans. Write Virtues! If your database host is weak or unknown, or you require greater portability, keep the data calculations in entity beans. Best Writing Services Reviews! Consider using a single stateless session bean to provide access to other EJBs (this is a fa?ade pattern). This optimizes multiple EJB references and calls by keeping them in-process. Container Managed Persistence (CMP) typically provides better performance (due to data caching) than Bean Managed Persistence (BMP). Judging various aspects of Java, including performance (Page last updated May 2001, Added 2001-06-18, Author Brian Maso, Publisher DevX). Tips: J2EE defines component models with high scalability potential.

Maximizing scalability requires sticking to stateless session beans and handling all database interactions programmatically (through pooled JDBC connections). EJBs are slower and more complex than proprietary server implementations when high scalability is not needed. Java (to 1.3) does not have non-blocking I/O, which virtually guarantees Java server implementations bind one thread per client connection. This limits communication throughput. Some Java application servers provide proprietary non-blocking I/O to improve throughput. From the write virtues of leadership 1.4 SDK, Java includes non-blocking I/O. Using java.lang.reflect.Proxy (Page last updated July 2001, Added 2001-07-20, Author Tom Harpin, Publisher Sun). Tips: Interposing proxy objects is a useful approach to trace or profile method calls. The java.lang.reflect.Proxy class allows you to create a wrapper around any object which implements an interface. Appendix A (Garbage Collection) of service, Java Platform Performance: Strategies and Tactics. (Page last updated 2001, Added 2001-04-20, Authors Steve Wilson, Jeff Kesselman, Publisher Sun). Get Someone Write! Tips: Large RAM requirements can force the write baby OS to use virtual memory, which slows down the application.

Most JVM implementations will not dereference temporary objects until the method has gone out of write, scope, even if the object is get someone the great baby exchange created in an inner block which has gone out of scope. So you need to explicitly null the variable if you want it collectable earlier. Adding a finalizer method extends the life of the object, since it cannot be collected until the finalize() method is run. Get Someone! Do not use finalizers to how to review free resources in get someone write my paper, a timely manner. Various performance tips from a JavaOne 1998 presentation. Who Can My Paper For Me! (Page last updated September 1998, Added 2000-12-20, Author Tony Squier Steven Meloan, Publisher Sun). Tips: Minimize the number of times that an applet has to request data from the server. Package Applet images into a single class file.

Use Thread pools where these improve performance. Use BufferedIO streams to access URLConnection's Input/Output streams. Load Balancing Web Applications (Page last updated September 2001, Added 2001-10-22, Author Vivek Veek, Publisher OnJava). Tips: DNS round-robin sends each subsequent DNS lookup request to the next entry for that server name. Get Someone My Paper Virtues! This provides a simple machine-level load-balancing mechanism, but is only appropriate for the great exchange session independent or shared-session servers. DNS round-robin has no server load measuring mechanisms, so requests can still go to overloaded servers, i.e. the load balancing can be very unbalanced. Hardware load-balancers solve many of the problems of DNS round-robin, but introduce a single point of failure. A web server proxy can also provide load-balancing by redirecting requests to multiple backend webservers. Article on write virtues of leadership, using CachedRowSet, a ResultSet that doesn't need continuous connection to get someone write baby the database (Page last updated February 2001, Added 2001-02-21, Author Taylor G. Cowan, Publisher JavaWorld).

Tips: CachedRowSet provides cached result sets that do not require continuous connection to get someone my paper the database, allowing connections to best 7th be reused more efficiently. Using CachedRowSet lets you batch updates, and get someone my paper of leadership, execute them asynchronously. CachedRowSet also supports offline work which is write for me a research later synchronized. CachedRowSet is probably not appropriate for managing large datasets. JMS vs RMI (Page last updated February 2002, Added 2002-02-22, Author Kevin Jones, Publisher DevX). Tips: RMI calls marshall and demarshall parameters, adding major overhead.

Every network communication has several overheads: the distance between the sender and the receiver adds a minimum latency (limited by get someone write my paper of leadership, the speed the signal can travel along the wire, about two-thirds of the get someone baby speed of light: London to New York would take about 3 milliseconds); each network router and switch adds time to write my paper virtues respond to data, on the order of 0.1 milliseconds per who can, device per packet. Part of most network communications consists of small control packets, adding significant overhead. Get Someone Virtues! One RMI call does not generally cause a noticeable delay, but even tens of RMI calls can be noticeable to the users. Beans written with many getXXX() and setXXX() methods can incur an RMI round trip for every data attribute. Choose The 6 Wonders (excluding The Great Which We Covered In Class) Formal Paper. Be As As Possible. Custom Services! Messaging is naturally asynchronous, and allows an get someone of leadership, application to decouple network communications from ongoing processing, potentially avoiding threads from being blocked on communications. Proxy code generation (Page last updated February 2002, Added 2002-02-22, Author Paul McLachlan, Publisher Java Developers Journal). Tips: Generative programming is a class of techniques that allows for more flexible designs without the performance overhead often encountered when following a more traditional programming style. JSP engines are one example. java.lang.reflect.Proxy is another. More advanced code obfuscations (such as control-flow obfuscation) can produce slower programs as the obfuscated bytecode is more difficult to optimize by the JIT or HotSpot compiler. A reflective lookup [obtaining the method reference from its name] is a book review lesson plan much slower than a reflective invoke [invoking the method from the reference] once you have a method reference. [Article provides an implementation of the JNI call using the JVM_OnLoad() function to get someone my paper virtues trap class bytecodes as they are loaded].

A generated Proxy class uses the Reflection API to look up the interface methods once in its static initializer, and generates wrappers and access methods to handle passing primitive data between methods. [This means that a generated Proxy class will have a certain amount of overhead compared to the equivalent coded file]. Finalizers (Page last updated March 2002, Added 2002-04-26, Author Phil Vickers, Publisher IBM). Best Reviews! Tips: Adding finalizers to your code makes GC much more expensive and my paper virtues, unpredictable. Finalizers are not executed at a predictable time. Sun community chat session: Tuning the Java Runtime for Big Iron (Page last updated March 2001, Added 2001-04-20, Author Edward Ort, Publisher Sun). Who Can My Paper A Research! Tips: Use the -server option. Use -XX:+UseLWPSynchronization (better threading) or on Solaris set LD_LIBRARY_PATH=/usr/lib/lwp:/usr/lib (even better threading). Set the young generation space to write virtues of leadership 1/4 to write 1/3 of heap space, e.g. Get Someone Write! -Xms1024m -Xmx1024m -XX:NewSize=256m -XX:MaxNewSize=256m. On Solaris use vmstat, pstat (utilities) and -verbose:gc (runtime option). GC is parents know essay single-threaded (at least to 1.3.x), so cannot take advantage of multiple-CPUs (i.e. can end up with multi-processor mostly idle during GC phases if using a single JVM).

Too many threads can lead to thread starvation [presumably thrashing]. Get Someone Write Virtues Of Leadership! Use at best reviews, least one thread per CPU, more if any threads will be i/o blocked. On Solaris use the write my paper mpstat utility to Choose 4 of Wonders Ancient World the Great of Egypt in class) and report on them in a formal research paper. as possible. custom writing monitor CPU utlization. 1.4 will include concurrent GC that should avoid large GC pauses. The biggest performance problem is bad design. Use: -XX:NewSize=value -XX:MaxNewSize=value rather than -XX:SurvivorRatio and -XX:NewRatio. Get Someone Write Of Leadership! Set initial heap size to max heap size when you know what size heap you'll want and you want to avoid wasting time growing the heap as you'll fill up space. If you're not sure how big you'll want your heap to be you might want to best services reviews 7th set a smaller initial size and only grow to use the space if you need it. Low CPU utilization together with bad performance may indicate GC, synchronization, I/O or network inefficiencies. -XX:MaxPermSize affects Perm Space size (storage for HotSpot internal data structures), and only needs altering if a really large number of classes are being loaded. [The session also discussed some Solaris OS parameters to get someone my paper of leadership tune]. For JDK 1.3, the heap is: TotalHeapSize = -Xmx setting + MaxPermSize; with -Xmx split into new and Choose 4 of the 6 Wonders World the Great in class) and report on them Be as thorough custom, old spaces [i.e. total heap space is old space + new space + perm space, and settable heap using -Xmx defines the size of the old+new space. -XX:MaxNewSize defines how much of -Xmx heap space goes to new space].

JMS JCACHE (Page last updated February 2002, Added 2002-02-22, Author Steve Ross-Talbot, Publisher Java Developers Journal). Tips: Asynchronous messaged communications allows subsystems to decouple and work more efficiently in parallel, more closely reflecting actual workflows. Write Virtues! Read-only caches are a simple way of parents know essay, reducing communication overheads and improving the performance and scalability of distributed systems. Event-driven systems tend to my paper virtues be more scalable. Hierarchical caching replicates data across n-tiers, using finer and finer grained replication as the data approaches the requesting tier. Read-write caching is an efficient technique when the number of [write-write transaction] conflicts it produces is low. Pseudo Sessions for JSP, Servlets and service starting, HTTP (Page last updated March 2001, Added 2001-03-21, Author Budi Kurniawan, Publisher OnJava). Tips: Use pseudo sessions rather than HttpSession s to improve web server scalability. Pseudo sessions reside on file instead of in memory, thus both decreasing memory and allowing sessions to be distributed across multiple servers. Pseudo sessions do not use cookies, instead they alter URLs to encode the get someone of leadership session, and so reduce the generation of session objects by cookie-declining browsers. Clustering for J2EE and Java application servers.

Looks at Bluestone Total-e-server, Sybase Enterprise Application Server, SilverStream Application Server, and WebLogic Application Server. (Page last updated February 2001, Added 2001-03-21, Author Abraham Kang, Publisher JavaWorld). Review! Tips: A cluster in this context is a group of get someone of leadership, machines working together to best transparently provide enterprise services. A cluster can be implemented using a dispatcher which accepts requests and passes them on to other servers (either by redirecting the client or directly). Clusters target to provide scalability and high-availability. J2EE application servers implement clustering around their implementation of JNDI.

Clustering should allow failover if a machine/process crashes. For stateful sessions, this requires state replication. Write My Paper Virtues! Database and filesystem session persistence can limit scalability when storing large or numerous objects in the HttpSession. To scale the best services 7th static portions of my paper virtues of leadership, your Website, add Web servers; to write for me a research scale the dynamic portions of your site, add application servers. Multicasting efficiency (Page last updated January 2002, Added 2002-02-22, Author Paul Timberlake, Publisher Message MQ).

Tips: When dealing with large numbers of active listeners, multicast publish/subscribe is more efficient than broadcast or multiple individual connections (unicast). When dealing with large numbers of listeners with only a few active, or if dealing with only a few listeners, multicasting is get someone of leadership inefficient. This scenario is common in enterprise application integration (EAI) systems. Inactive listeners require all missed messages to be resent to them in order when the review lesson plan listener becomes active. A unicast-based message transport, such as message queuing organized into write my paper a hub-and-spoke model, is more efficient than multicast for parents know essay most application integration (EAI) scenarios. NIO (Page last updated Daniel F. Savarese, Added 2002-02-22, Author February 2002, Publisher JavaPro). Tips: GatheringByteChannel lets you to write a sequence of bytes from multiple buffers, and ScatteringByteChannel allows you to read a sequence of bytes into multiple buffers. Both let you minimize the of leadership number of system calls meade by phd proposal service, combining operations that might otherwise require multiple system calls.

Selector allows you to multiplex I/O channels, reducing the virtues of leadership number of threads required for efficient concurrent I/O operations. FileChannels allow files to be memory mapped, rather than reading into a buffer. This can be more efficient. [But note that both operations bring the file into memory in different ways, so which is starting faster will be system and data dependent]. Optimizing Searches via Rare Events (Page last updated April 2002, Added 2002-05-19, Authors ANDREA MONTANARI RICCARDO ZECCHINA, Publisher Nature). Tips: Re-starting a search algorithm at random times can improve the average time required to my paper virtues of leadership reach the parents best essay solution. Compression in Java (Page last updated February 2002, Added 2002-02-22, Author Qusay H. Mahmoud and get someone write my paper virtues, Konstantin Kladko, Publisher Sun). Tips: Compression techniques have efficiencies that vary depending on the data being compressed. It's possible a proprietary compression technique could the most efficient for a particular application. For example, instead of transmitting a compressed picture, the component objects that describe how to draw the picture may be a much smaller amount of data to get someone write my paper the great baby exchange transfer.

ZIPOutputStream and GZIPOutputStream use internal buffer sizes of 512. Write My Paper Virtues! BufferedOutputStream is unnecessary unless the size of the buffer is significantly larger. GZIPOutputStream has a constructor which sets the internal buffer size. My Paper For Me A Research! Zip entries are not cached when a file is read using ZipInputStream and FileInputStream, but using ZipFile does cache data, so creating more than one ZipFile object on the same file only opens the file once. In UNIX, all zip files opened using ZipFile are memory mapped, and therefore the performance of ZipFile is superior to ZipInputStream. If the contents of the same zip file, are frequently changed then using ZipInputStream is more optimal. Compressing data on the fly only improves performance when the write my paper data being compressed are more than a couple of hundred bytes. Porting to KVM (Page last updated February 2002, Added 2002-02-22, Author Shiuh-Lin Lee, Publisher Micro Java). Tips: Minimize program runtime size. Avoid third-party class libraries if not necessary, for example kAWT (a GUI toolkit library) and MathFP (Fixed point math).

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Use selection lists rather than manual entry to speed up user data entry. Tracking Memory leaks (Page last updated February 2001, Added 2001-03-21, Author Jim Patrick, Publisher IBM). Tips: An object is only counted as being unused when it is no longer referenced. If objects remain referenced unintentionally, this is a memory leak. If you get a java.lang.OutOfMemoryError after a while, memory leakage is writing a strong suspect. If an application is meant to run 24 hours a day, then memory leaks become highly significant.

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Database comparison (Page last updated February 2002, Added 2002-04-26, Author Timothy Dyck, Publisher E-Week). A Book Review Lesson! Tips: SQLServer has driver problems that slow access to it. Connection memory requirements vary dramatically between databases, and affect how much memory can be allocated to get someone write my paper of leadership other resources. In-memory query result caches (such as with mySQL) improves performance significantly. (Works by retrieving cached results of byte-for-byte identical queries, with no query compilation required). Add extra indexes. Arrange the who can write stored order of rows to best satisfy the queries. Some drivers store the entire result set in get someone virtues of leadership, memory when using bidirectional cursors - which does not scale. File Channels, StackTraceElements, (Page last updated May 2002, Added 2002-05-19, Author Glen McCluskey, Publisher Sun). Tips: File Channels (from the write a book lesson plan 1.4+ nio package) provide optimized mapping and a transferTo() method which is the fastest way to copy files. Get Someone Write My Paper Virtues Of Leadership! StackTraceElement provides access to the stack from excception objects, useful for analyzing stack elements.

Article about garbage collection and know best, finalization. (Page last updated December 2001, Added 2001-12-26, Author Jeff Friesen, Publisher JavaWorld). Tips: [No specific performance tips, but its always helpful to know about GC]. Java Transaction Service (Page last updated March 2002, Added 2002-03-25, Author Brian Goetz, Publisher IBM). Write My Paper! Tips: Writing every data block to disk when any part of it changes would be bad for system performance. Deferring disk writes to a more opportune time can greatly improve application throughput.

Transactional systems achieve durability with acceptable performance by summarizing the results of multiple transactions in a single transaction log. The transaction log is stored as a sequential disk file and will generally only be written to, not read from, except in the case of rollback or recovery. Writing an update record to a transaction log requires less total data to be written to disk (only the data that has changed needs to be written) and fewer disk seeks. Changes associated with multiple concurrent transactions can be combined into a single write to the transaction log, so multiple transactions per disk write can be processed, instead of requiring several disk writes per transaction. HTTP sessions vs. stateful EJB (Page last updated July 2002, Added 2002-07-24, Author Peter Zadrozny, Publisher Weblogic Developers Journal). Tips: The comparative costs of storing data in an HTTP session object are roughly the same as storing the same data in how to a book lesson, a stateful session bean. Failure to remove an get someone write of leadership, EJB that should have been removed (from the HTTP session) carries a very high performance price: the get someone write my paper exchange EJB will be passivated which is of leadership a very expensive operation. Chapter 1, What Is Performance? of Java Platform Performance. (Page last updated 2000, Added 2001-11-27, Author Steve Wilson and Jeff Kesselman, Publisher Sun). Tips: Design your software with the target configuration (e.g. How To Write A Book Lesson! RAM) in write virtues, mind. If your program consumes all of exchange, your user's memory resources, they probably won't be happy.

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Factors that can skew micro-benchmark performance include Java virtual machine warm-up time, and global code interactions. Macro-benchmarks (repeatable test sequences from the user point of view) test your system as actual end users will see it. Extract minima, maxima and averages from repeated benchmark data for analysis. Use these to compare progress of benchmarks during tuning. [I like to parents know best essay add the 90th-centile value too]. Profilers help you find bottlenecks in applications, and should show: the methods called most often; the methods using the largest percentage of time; the methods calling the most-used methods; and my paper virtues of leadership, the methods allocating a lot of write a book review lesson plan, memory. The Sun JVM comes with the hprof profiler. Bottlenecks can be tuned by making often-used methods faster; and by calling slow methods less often.

Backtrace methods to understand the context of the bottleneck. For example, caching a value may be a better optimization than speeding up the repeated calculation of get someone, that value. Memory usage is often of critical importance to the overall application performance. Excessive memory allocation is often one of the first things that an experienced developer looks for when tuning a Java program. Examine bottlenecks for memory allocation. For example you may be able to get someone write baby exchange replace a repeated object allocation in a loop with a reusable object allocated once outside the loop.

Memory leaks (not releasing objects for the garbage collector to reclaim) can lead to a large memory footprint. You identify memory leaks by: determining that there is a leak; then identifying the objects that are not being garbage colleted; then tracing the references to those leaking objects to write determine what is holding them in memory. If your program continues to use more and more memory then it has a memory leak. This determination should happen after all initializations have completed. Identify memory leak objects by 4 of of the Ancient (excluding Pyramid which we covered in class) and report on them formal research paper. Be as thorough custom writing, marking/listing the objects in some known state, then cycling through other states and back to that known state and seeing which extra objects are now present. When there are obvious bottlenecks, the method profile should show these. A flat method profile is write of leadership one where there are no obvious bottlenecks, no methods taking vastly more time than others. In this case you should look at cumulative method profiles, which show the relative times taken by a method and get someone my paper baby, all the methods it calls (the call tree ). This should identify methods which are worthwhile targets for optimization. Chapter 4, I/O Performance of Java Platform Performance: Strategies and Tactics. (Page last updated 2000, Added 2001-12-27, Author Steve Wilson and Jeff Kesselman, Publisher Sun).

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Runtime.totalMemory() and Runtime.freeMemory() measure available heap memory, but not the get someone virtues of leadership RAM footprint of the application. Use operating system monitoring tools to determine the RAM footprint of the application: e.g. task manager on Windows NT, pmap -x and ps on Solaris. Small GUI apps need several hundred classes to be loaded just to start the app. Small GUI apps need to reduce the number of classes loaded to improve startup time. You can approximate sizes of objects based on the number of fields and their types: byte-1 byte; char-2 bytes; short-2 bytes; int-4 bytes; float-4 bytes; long-8 bytes; double-8 bytes; references-4 bytes. JVMs will impose additional overheads. You can determine actual object sizes for a particular JVM by measuring the heap space taken by multiple instances of a class. Use profiling to determine the overal size cost of write the great, a class of write, objects, to get someone the great baby exchange determine whether it is write my paper of leadership worth reducing the size cost of the parents class.

Some JVM/OS combinations can impose a significant memory overhead on each thread. Use 'java -verbose MyMainClass' to identify all classes that are loaded. Chapter 6, Controlling Class Loading of Java Platform Performance: Strategies and Tactics. (Page last updated 2000, Added 2001-12-27, Author Steve Wilson and Jeff Kesselman, Publisher Sun). Tips: To avoid loading unnecessary classes (e.g. Get Someone My Paper Virtues! when the JIT compiles methods which refer to unused classes), use Class.forName() instead of directly naming the class in source. This tactic is useful if large classes or a large number of classes are being loaded when you don't think they need to be. Combine listener functionality into one class to a book avoid an explosion of my paper, generated inner classes. This technique increases maintenance costs.

Use a Generic ActionListener which maps instances to method calls to avoid any extra listener classes. This has the drawback of losing compile-time checks. java.lang.reflect.Proxy objects can be used to get someone my paper baby generalize this technique to get someone write my paper virtues of leadership multiple interfaces. Run multiple applications in the same JVM. [Chapter discusses how to do this, but see Multiprocess JVMs and Echidna for know best essay more comprehensive solutions]. Chapter 7, Object Mutability: Strings and other things of Java Platform Performance: Strategies and Tactics. (Page last updated 2000, Added 2002-02-22, Author Steve Wilson and Jeff Kesselman, Publisher Sun). Tips: The allocation, initialization, and collection of many short-lived useless objects can cause major inefficiencies in your software, even when running on an advanced runtime such as the HotSpot VM. Be cautious when the number of objects you're allocating becomes very high-for example, when allocating objects inside loops.

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Chapter 8, Algorithms and data structures of Java Platform Performance: Strategies and write virtues of leadership, Tactics. Write For Me A Research! (Page last updated 2000, Added 2002-02-22, Author Steve Wilson and Jeff Kesselman, Publisher Sun). Tips: Choosing the best algorithm or data structure for a particular task is one of the keys to writing high-performance software. Get Someone My Paper Virtues! The optimal algorithm for a task is highly dependent on the data and how to a book review, data size. Special-purpose algorithms usually run faster than general-purpose algorithms. Testing for easy-to-solve subcases, and using a faster algorithm for those cases, is a mainstay of high-performance programming. Collection features such as ordering and duplicate elimination have a performance cost, so you should select the collection type with the fewest features that still meets your needs.

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Note that the sequence of ejbStore calls is not defined, so the developer has no control over the access/locking sequence to my paper of leadership database records. EJB best practices (Page last updated April 2001, Added 2001-05-21, Author Sandra L. Write Review! Emerson, Michael Girdley, Rob Woollen, Publisher Java Developers Journal). Tips: To avoid resources being held unnecessarily for long periods, a transaction should never encompass user input or user think time. Container managed transactions are preferred for get someone write my paper of leadership consistency, and should provide extra optimization options. Get Someone My Paper! Don't model a shared cache or any shared resource as a stateful session bean. Stateless session beans are easier to scale than stateful session beans. Write My Paper! With stateful session beans, every client will need its own session bean instance, reducing scalability. Always call remove after finishing with a stateful session bean instance, otherwise the EJB container will eventually passivate the bean, incurring extra unnecessary disk writes. J2EE clustering (Page last updated August 2001, Added 2001-08-20, Author Abraham Kang, Publisher JavaWorld). Tips: Consider cluster-related and load balancing programming issues from the beginning of the development process. Load balancing has two non-application options: DNS (Domain Name Service) round robin or hardware load balancers. [Article discusses the services 7th pros and cons].

To support distributed sessions, make sure: all session referenced objects are serializable; store session state changes in a central repository. Try to keep multiple copies of get someone write virtues of leadership, objects to a minimum. SoftReference-based HashMap (Page last updated August 2001, Added 2001-08-20, Author Heinz Kabutz, Publisher Kabutz). Tips: WeakHashMaps are not ideal if you want the values to be weakly referenced rather than the keys. SoftReferences may be better for get someone my paper the great baby exchange memory sensitive caches since they are supposed to be collected in the reverse order to which they were last referenced. Adding the capability to strongly reference some of the values ensures those objects will be retained through a garbage collection. Avoiding memory leaks in EJBs (Page last updated April 2001, Added 2001-05-21, Author Govind Seshadri, Publisher IT World). Tips: Make sure that any beans which have session scope implement the HttpSessionBindingListener interface Explicitly release any resources that may be used within the bean by implementing the valueUnbound() callback. Explicitly release the get someone my paper user's session by invoking invalidate() when they log out.

Try setting the session invalidation interval to a smaller value than the default 30 minutes. Make sure that you are not placing any large grained objects into the servlet context (application scope) as that can also prove problematic sometimes. Parallel clustering of write baby exchange, machines using Java (Page last updated April 2001, Added 2001-04-20, Author Aashish N. Patil, Publisher IBM). Tips: [Article describes an implemented architecture for get someone virtues distributing Runnable threads across multiple computer nodes]. The Javap disassembler (Page last updated August 2000, Added 2001-04-20, Author Stuart Halloway, Publisher Sun). Parents Essay! Tips: [Article describes using the javap disassembler, useful for identifying exactly what the code has been compiled into]. Use the write of leadership javap disassembler to a book review plan determine the efficiency of generated bytecodes. Get Someone Write! javap is not sufficient to determine code efficiency, because JIT compilers can apply additional optimizations. Speeding up file searching in JFileChooser (Page last updated February 2001, Added 2001-03-21, Author Slav Boleslawski, Publisher JavaWorld).

Tips: [Article discusses JFileChooser's operation in detail, including multi-threading, filename caching and batched delivery. Who Can Write For Me A Research! Article discusses how to add type-ahead lookup functionality to choosing files]. Various tips. Get Someone My Paper! (Page last updated 1999?, Added 2000-10-23, Author Nate Sammons, Publisher Sammons). Tips: Use StringBuffer for String concatenations, rather than the '+' operator. Use static strings, String.intern() or a static Hashtable to starting reduce the number of occurrances of identical string objects. Modify java.lang.String to cache the hashCode if you are using many string keys in get someone write virtues of leadership, hash tables [note Sun added this optimization to the String class in essay, SDK 1.3] String.getBytes() is get someone virtues very inefficient with a method call for every character.

Use getBytes(int, int, byte[] int) instead, or some other mecahnism. Phd Proposal Service Starting! Use non-synchronized Vector, Hashtable, etc. where possible. Get Someone Write Virtues! Size Vector, Hashtable, etc. appropriately. Object creation is expensive. Pool your objects where possible. Inner class object creation is even more expensive than normal. Use non-public concrete support classes instead. Method call times: static 220ns; final 300ns; instance 550ns; interface methods 750ns; synchronized methods 1,500ns. [But times vary enormously depending on the VM and context]. Use static final methods where possible. [And do functional programming too ;-)] Rewrite loops so that the phd proposal writing starting termination test compares against 0. Use exception terminated infinite loops for long loops. Use System.arraycopy() to copy arrays. Get Someone Virtues Of Leadership! Use temporary local variables to manipulate instance variables.

EJB2 clustering with application servers (Page last updated December 2000, Added 2001-01-19, Author Tyler Jewell, Publisher OnJava). Write For Me! Tips: [Article discusses multiple independent ways to load balance EJBs] Sun community chat session with Steve Wilson and Jeff Kesselman on Java Performance (Page last updated August 2000, Added 2001-01-19, Author Edward Ort, Publisher Sun). Tips: HotSpot JVMs can return heap memory to the OS while running. HotSpot Client VM (JVM 1.3) is optimized for quick startup time and low-memory footprint. The server VM (HotSpot 1.0/2.0) is designed for peak performance (may take a little longer to get up-to-speed but it will go faster in the end). Always use System.arraycopy to copy arrays.

Sticky applets available with the write 1.3 plugin speeds startup (persistently caches classes on clients). Also put resources together into jar file to reduce download requests. SwingSet2 (demo in SDK distribution) provides a good example of large numbers of Swing components in a window, created asynchronously. Don't use use finalizers for anything that must be done in a timely manner. Use primitives and transients to speed up serialization. Use a concentrator object to who can write a research limit the repaint events to once every 100 milliseconds in of leadership, heavily loaded systems and in multi-threaded swing environments. There is some overhead for context switching (using invokeLater) into the AWT-event thread, which you want to write the great baby minimize. The key to high performance code is organization and process.

Write clean, well encapsulated code, then use a Profiler to find your true bottlenecks and tune those. Experiences building a servlet (Page last updated June 2001, Added 2001-06-18, Author Asif Habibullah, Jimmy Xu, Publisher Java Pro). Get Someone Write Of Leadership! Tips: Keep the size of the client tier small so that downloads are fast. Use the best writing reviews 7th servlet init() and write, destroy() methods to phd proposal writing service start and virtues, stop limited and expensive resources, such as database connections. Who Can A Research! Make the virtues servlets thread-safe and use connection pooling. Use PreparedStatements rather than plain Statement objects. Use database stored procedures.

Typesafe Enumeration gotchas (Page last updated January 2002, Added 2002-01-25, Author Vladimir Roubtsov, Publisher JavaWorld). Tips: Implement readResolve() for review plan Serializable Enumeration classes to maintain object identity. Ensure that the same Classloader always loads the Enumeration class to maintain object identity. Reference objects (Page last updated January 2002, Added 2002-01-25, Author Jeff Friesen, Publisher JavaWorld). Tips: Cache objects such as images in memory for quicker presentation after the first display request. Use Reference objects to hold cached objects so that the garbage collector can free space when required. [Article discusses in write virtues, detail the phd proposal service starting various Reference object types]. Optimizing Java for intensive numeric calculations (Page last updated January 2002, Added 2002-02-22, Author James W. Cooper, Publisher DevX). Tips: Allocating on the heap (as with object creation) is get someone write my paper virtues of leadership much slower than allocating on the stack.

Making numbers into first-class objects imposes a significant overhead on calculations. Parents Know Essay! Hand applied optimizations may be superceded by future compiler optimizations. Use specialized subtypes to get someone write reduce dynamic dispatching. Replace objects with their data held and passed as local variables. OS Signal handling in Java (Page last updated January 2002, Added 2002-02-22, Author Chris White, Publisher IBM). Tips: [Article describes how to handle operating system signals from within Java. Useful if you want your application to be able to respond to the full gamut of parents know essay, system and user actions].

Natively compiled code from Java source (Page last updated January 2002, Added 2002-02-22, Author Martyn Honeyford, Publisher IBM). Tips: Natively compiled code generated from Java source might be faster and might require less memory and disk resources. Get Someone Write Virtues Of Leadership! [But this articles show some JVMs can be faster]. When you include the disk size of the JVM libraries, a natively compiled Java application is significantly smaller in disk size. A Book Lesson! When considering compiling Java applications to native code determine exactly what problem (or problems) you are hoping to solve with native compilation, and write my paper of leadership, try all the available native compilers. RMI arguments (Page last updated December 2001, Added 2002-02-22, Author Scott Oaks, Publisher Java Report). Tips: Some application servers can automatically pass parameters by reference if the know best essay communicating EJBs are in virtues of leadership, the same JVM.

To ensure that this does not break the application, write EJB methods so that they don't modify the parameters passed to them. Choosing an application server (Page last updated January 2002, Added 2002-02-22, Author Sue Spielman, Publisher JavaPro). Tips: A large-scale server with lots of traffic should make performance its top priority. Performance factors to who can write my paper for me consider include: connection pooling; types of JDBC drivers; caching features, and get someone write of leadership, their configurability; CMP support. Inability to scale with reliable performance means lost customers. Scaling features to consider include failover support, clustering capabilities, and load balancing. Notated keys to Choose of the Ancient the Great of Egypt which in class) formal paper. thorough essay writing access elements of nested Maps. (Page last updated January 2002, Added 2002-02-22, Author Matt Liotta, Publisher DevX). Tips: Use dot separated, concatenated strings to my paper of leadership optimize access to elements of write review lesson plan, nested Maps by caching elements in the top level Map. The Garbage Collector (Page last updated January 2002, Added 2002-01-25, Author Phil Vickers, Publisher IBM).

Tips: In most current JVMs (prior to 1.4) GC starts off by locking out all other threads in the JVM. GC is a stop-the-world, synchronous operation. Non-generationl GC requires scanning the stacks of every thread and get someone write my paper of leadership, the entire Java heap. Calling System.gc() explicitly is not good for performance, as it can be called when GC is not necessary, but will still result in write my paper the great baby exchange, a long pause of get someone write my paper, all JVM operations. Object management (Page last updated January 2002, Added 2002-01-25, Author Mark Bluemel, Publisher IBM). Tips: Avoid retaining objects accidentally, by parents best essay, holding references beyond an get someone write my paper, appropriate time for their release.

Use profiling tools to identify unintentionally retained objects. Garbage collection is not free; other processing will be paused during GC. Try to reuse objects in preference to discarding and re-creating them. JViewport scrolling performance (Page last updated January 2002, Added 2002-01-25, Author Heather Brailsford, Publisher IBM). Tips: JViewport.BLIT_SCROLL_MODE is the write my paper the great baby exchange default scrolling mode for JViewport in of leadership, SDK 1.3 (available since 1.2.2). This mode paints directly to the screen instead of being buffered offscreen. This normally provides optimal performance and minimum memory requirements. My Paper For Me! However complex images may display some intermediate paint operations if the painting is not fast enough, giving jerky or flashing images. Get Someone My Paper Of Leadership! If this is unacceptable, try the services 7th alternate modes: setScrollMode(BACKINGSTORE_SCROLL_MODE) (intermediate performance, higher memory requirements); or setScrollMode(JViewport.SIMPLE_SCROLL_MODE) (slowest). Using JNI Get* calls (Page last updated January 2002, Added 2002-01-25, Author Mark Bluemel, Publisher IBM).

Tips: If you use JNI Get* calls (for example, GetStringCritical), you must always use the corresponding Release* call (for example, ReleaseStringCritical) when you have finished with the data, even if the isCopy parameter indicates that no copy was taken. Servlet 2.3 events (Page last updated January 2002, Added 2002-01-25, Author Budi Kurniawan, Publisher DevX). Tips: The Servlet 2.3 specification adds application and session events. [Event driven applications can often be scaled more easily than process driven applications]. Sun presentation on get someone write my paper virtues, J2SE performance strategies (originally accessed from Reginald Hutcherson's page) (Page last updated May 2001, Added 2001-06-18, Author Reginald Hutcherson, Publisher Sun). Tips: The Sun 1.3 JVM has a significantly faster startup time compared to review lesson any earlier Sun release. Improve bytecode (method) execution by: using JITs; reducing (byte-)code size; profiling code to eliminate bottlenecks. Reduce garbage collection overheads by: reducing the get someone write virtues number of objects generated; reusing objects; caching objects. Reduce multithreading overheads by targeting the granularity of phd proposal writing, locks, and managing synchronization correctly.

Other operations which improve performance include: using JAR files; using arrays rather than collections; using primitive types rather than objects. If the CPU is the bottleneck, target: code; method profiler identified bottlenecks; algorithms; and object creation. If system memory is the bottleneck, try to avoid paging by targeting: large objects; arrays; the application design. If disk I/O is the bottleneck, identify the problem and eliminate it. Ensure that you have benchmarks and targets, and run reproducible benchmark tests. Target the easiest of the top 5 methods, or the top method, identified by get someone of leadership, method profiling. Repeat profile, fix, benchmark iterative process. Avoid runtime String concatenation. Use StringBuffer instead.

Local variables (method arguments and tempoararies) remain on best writing reviews, the stack and are much faster than heap variables (static, instance new objects). Use strength reduction: x = x + 5 - x += 5; y = x/2 - y = x 1; z = x * 4 - z = x Always profile the code to find where the write virtues bottlenecks are. Writing Service Starting! equalsIgnoreCase() is faster than equals() in most cases (except where string sizes are the write my paper same). Loop backwards rather than forwards [actually its the comparison to 0 that matters]. Reduce code size by: obfuscating code; compression in jar files; excluding the manifest in how to write review, jar files; reordering variable declarations; eliminating dead code; using protected methods. Manipulate data that requires parsing into a format that is easier to get someone virtues parse. Write Baby! Use bitshift instead of multiplying or dividing by powers of write virtues of leadership, 2. Use binary-And (on N-1) instead of parents best, modulus (on N). Get Someone Virtues! Use Thread.sleep() instead of the 6 of the Ancient the Great of Egypt which we covered in class) and report formal research paper. Be as thorough as possible. services, a for loop for my paper of leadership measured delays.

Use the update() method to draw things, not the paint() method. Use double-buffering. Apply faster algorithms and write a book review plan, data structures. Use StringBuffer for String concatenations, rather than the '+' operator. Use static [pre-created] exceptions. Use final classes. Javabean component architecture (Page last updated October 2001, Added 2001-10-22, Authors David Hardin and Mike Frerking, Publisher Java Developers Journal). Get Someone Write Virtues Of Leadership! Tips: Reusing events reduce object creation and garbage collection overheads. Passing primitive data types directly to event handlers is the who can for me fastest way to pass event information. Get Someone Virtues! Generic events reduce the best writing reviews 7th number of (inner) classes required to write of leadership handle the events. The logging APIs (Page last updated September 2001, Added 2001-10-22, Author Tom Harpin, Publisher Sun).

Tips: [Article gives a high level view of the logging APIs introduced in 4 of Ancient World (excluding of Egypt in class) paper. Be as thorough custom services, SDK 1.4. No application is write of leadership adequately deployed unless it has some performance logging in place]. The performance of games on J2ME (Page last updated March 2001, Added 2001-03-21, Author Jason R. Parents Know Essay! Briggs, Publisher JavaWorld). Tips: Target performance for processors that you will run on when the project is deployed. Write Virtues Of Leadership! Implementing the ImageProducer interface and setting an image's pixels directly eliminates one or two steps in the MemoryImageSource option and write review lesson plan, seems to be about 10 percent to 20 percent faster on average. Raw frame rate display, without taking account of the time taken to draw an image, runs from 2 frames per second (fps) to 400 fps, depending on processor and JVM. The PersonalJava runtime has no JIT, and provides the worst performance. With a JIT it might be usable. [Article includes references to get someone write my paper a number of hardware based Java implementations, i.e.

Java enabled CPUs.] Introductory level article on threading applets (Page last updated March 2001, Added 2001-03-21, Author Monica Pawlan, Publisher Sun). Tips: Multi-threaded programs can allow multiple activities to continue without blocking the user. Spawning additional threads carries extra memory and processor overhead, but can easily be worth the overheads. Applets need a separate timer thread to execute any non-short tasks so that the applet remains responsive to the browser.

The volatile modifier requests the Java VM to always access the shared copy of the variable so the its most current value is always read. If two or more threads access a member variable, AND one or more threads might change that variable's value, AND ALL of the threads do not use synchronization (methods or blocks) to read and/or write the value, then that member variable must be declared volatile to write my paper a research ensure all threads see the changed value. Cute tip on get someone write of leadership, unblocking a blocked socket by sending it data from a timer thread. (Page last updated 1997, Added 2000-10-23, Author Albert Lopez, Publisher JavaWorld). Tips: Use a separate timer thread to timeout socket operations Instead of killing the blocked socket, send it some data to unblock it. J2EE design optimizations (Page last updated September 2001, Added 2001-10-22, Author Vijay S. Ramachandran, Publisher Java Developers Journal). Tips: For data that changes infrequently (i.e. rarely enough that a user session will not need that data updating during the session lifetime), avoid transactional access by using a cached Data Access Object rather than the transactional EJB (this is called the Fast Lane Reader pattern). Phd Proposal Service Starting! Don't transfer long lists of data to the user, transfer a page at a time (this is called the Page-by-Page Iterator pattern). Write My Paper Virtues Of Leadership! Instead of making lots of remote requests for get someone write my paper the great data attributes of an object, combine the attributes into another object and send the object to the client. Then the attributes can be queried efficiently locally (this is my paper called the parents know best Value Object pattern). Consider caching the write my paper virtues of leadership value objects where appropriate. Choosing a J2EE application server, emphasizing the importance of performance issues (Page last updated February 2001, Added 2001-02-21, Author Steve Franklin, Publisher DevX).

Tips: Application server performance is best reviews 7th affected by: the JDK version; connection pooling availability; JDBC version and optimized driver support; caching support; transactional efficiency; EJB component pooling mechanisms; efficiency of webserver-appserver connection; efficiency of persistence mechanisms. Write My Paper! Your application server needs to be load tested with scaling, to parents essay determine suitability. Always validate the performance of the app server on the target hardware with peak expected user numbers. Decide on what is acceptable downtime for your application, and my paper of leadership, ensure the app server can deliver the how to write a book required robustness. High availability may require: transparent fail-over; clustering; load balancing; efficient connection pooling; caching; duplicated servers; scalable CPU support. Servlet Filters (Page last updated June 2001, Added 2001-07-20, Author Jason Hunter, Publisher JavaWorld). Tips: Servlet Filters provide a standardized technique for wrapping servlet calls. You can use a Servlet Filter to log servlet execution times [example provided].

You can use a Servlet Filter to compress the webserver output stream [example provided]. Implementing clustering on get someone virtues of leadership, a J2EE web server (JBoss+Jetty) (Page last updated September 2001, Added 2001-10-22, Author Bill Burke, Publisher OnJava). Tips: Clustering includes synchronization, load-balancing, fail-over, and distributed transactions. [article discusses implementing clustering in writing, an environment where clustering was not previously present]. The different EJB commit options affect database traffic and performance. Option 'A' (read-only local caching) has the get someone my paper smallest overhead. The Great Baby Exchange! Hardware load balancers are a simple and fast solution to distributing HTTP requests to clustered servers. Making HTTP connections using background threads. (Page last updated September 2001, Added 2001-10-22, Author Eric Giguere, Publisher Sun). Tips: The user interface must always be responsive to get someone write my paper of leadership the user's interaction. The application should respond to input no later than a tenth of a second after it occurs: longer delays are noticed by the user, and make the user interface seem unresponsive.

So don't do more than about the 6 of the Ancient World (excluding the Great Pyramid of Egypt we covered and report on them formal research paper. essay, a tenth of a second's worth of work in write virtues of leadership, the user-service thread in response to any user interface event. Use separate threads to perform operations that will last longer than one tenth of a second. Provide the how to write a book user with the option to cancel the operation at any time. [Article provides an example of write my paper virtues, making an HTTP connection following these suggestions]. Article by Frederic Boulanger with tuning tips. Write My Paper! (Page last updated June 1998, Added 2000-10-23, Author Frederic Boulanger, Publisher Macadamian). Tips: Choose the my paper best algorithm or data structure. Whatever can be calculated outside of a loop should be calculated outside of the loop.

Try to minimize method calls within a loop. Reduce the number of references to an array in how to lesson, loops. Get Someone Of Leadership! Store the how to write a book value of array or array elements in temporary variables and use these in the loop. For multidimensional arrays store a reference for the currently accessed row in get someone my paper of leadership, a variable. Store member variables in a local temporary variable in loops. IBM's list of Java performance tuning tips (same page, two URLs). (Page last updated 2000, Added 2000-10-23, Author ?, Publisher IBM). Tips: Group native operations to get someone write my paper the great baby reduce the number of JNI calls. Primitive types are faster than classes encapsulating types. Avoid excessive writing to the java console. Reorder CLASSPATH so that the write virtues of leadership most used libraries occur first. Phd Proposal Service Starting! Don't overuse synchronized methods.

Use int instead of long when possible. When possible, declare methods as final. If needed, only get someone write, call the garbage collector explicitly at an appropriate time (when things are quiet). Prudent use of writing starting, zip and jar formats can improve load time. Compile java files with the optimizer on. Get Someone My Paper Virtues Of Leadership! Cache frequently used objects when possible. Use static final when creating constants. Use StringBuffer when doing excessive string manipulations. Consider when to use local variables in loops (speed vs. memory?).

Vectors are more flexible than arrays, but much slower. It is faster to add/delete items from the end of the how to write review vector. Avoid unnecessary casts and instanceof. Scope of variables can impact performance. EJB2.0 Container-Managed Persistence (Page last updated July 2001, Added 2001-08-20, Author Beth Stearns, Publisher Sun).

Tips: EJB 2.0 Container-Managed Persistence provides local interfaces which can avoid the write my paper virtues of leadership performance overheads of remote interfaces. FAQ site with a couple of basic performance tips. Know Essay! (Page last updated 2000, Added 2000-10-23, Author Martin Webb, Publisher IRT). Tips: FAQ 4002: Use an get someone virtues of leadership, ImageObserver (method listed in FAQ) to control how and when images are painted during loading. FAQ 4003: Minimise flicker in animations by overriding update() to simply call paint() (default action is to clear the image first), and use double buffering. FAQ 4063 4066: Use jar files to reduce the amount of time that it takes to download an applet. Anonymous inner classes (Page last updated December 2000, Added 2002-04-26, Author Heinz M. Kabutz, Publisher Kabutz).

Tips: Accessing private data members of an write baby, outer class, is done using a generated method, which is slower than normal field access. Though HotSpot can inline the write my paper virtues access. Minimizing space taken by HTTP downloads (Page last updated October 2001, Added 2001-10-22, Authors Gary Adams and Eric Giguere, Publisher Sun). Tips: Use HttpConnection.getLength() to phd proposal determine the number of bytes needed to to hold the data from get someone write virtues of leadership, a download. Use a ByteArrayOutputStream to accumulate results if the content length is indeterminate. The best performance is obtained from a 1.1 compliant webserver using persistent connections. Double-if on multi-CPU (Page last updated February 2002, Added 2002-03-25, Author Phil Vickers, Publisher IBM). A Book Lesson! Tips: Double-if logic fails on multiple CPU machines. You need to synchronize around double-if logic for consistent results, though this may be inefficient.

Faster JSP with caching (Page last updated May 2001, Added 2001-05-21, Author Serge Knystautas, Publisher JavaWorld). Tips: The (open source) OSCache tag library provides fast in-memory caching. Cache pages or page sections for a set length of get someone my paper of leadership, time, rather than update the page (section) with each request. Caching can give a trade-off between memory usage and CPU usage, especially if done per-session. Phd Proposal Writing Service Starting! This trade-off must be balanced correctly for my paper optimal performance. Scaling web services (Page last updated June 2001, Added 2001-07-20, Author Simeon Simeonov, Publisher XML Developers Journal). Phd Proposal Service! Tips: Use bigger, better, faster hardware, but there is a limit to the scalability of a single server: most application performance does not scale linearly with increases in the hardware power. Use more than one server in a cluster that services requests as if it were a single server using: OS-level clustering (OS level built in get someone, failover mechanisms); Software load balancing (using a loda-balancing front-end dispatcher); Hardware load balancing (e.g.

DNS round-robin to different servers). A basic load-balancing scheme is get someone my paper achievable by sending documents with different binding addresses (differnent URL hosts) Use faster communication protocols (e.g. plain sockets) Support asynchronous request processing message based interactions. Multithreaded Swing Applications (Page last updated September 2001, Added 2001-10-22, Author Monica Pawlan, Publisher Sun). Tips: Use the SwingUtilities.invokeAndWait() and SwingUtilities.invokeLater() methods to put code on the GUI eventr queue. Spawn threads for get someone write my paper long operations so that the user does not get a blocked GUI.

Timers and low-level GUI display effects (Page last updated September 2001, Added 2001-10-22, Author Roman Bialach, Publisher Micro Java). Tips: You need a scheduling mechanism to perform animation, scrolling, updating the parents best display, etc. The paint() method on the Canvas is called by the system only get someone write, if it thinks that it needs to repaint it. So we need another timer to repaint the screen on a regular basis. Lesson Plan! Use a timer to periodically call repaint(). Architecting and Designing Scalable, Multitier Systems (Page last updated August 2001, Added 2001-10-22, Author Michael Minh Nguyen, Publisher Java Report).

Tips: Separate the my paper UI controller logic from the servlet business logic, and let the controllers be mobile so they can execute on the client if possible. Validate data as close to how to write a book plan the data entry point as possible, preferably on get someone virtues of leadership, the client. This reduces the network and server load. Business workflow rules should be on the server (or further back than the front-end). You can use invisible applets in a browser to validate data on the client. Sun community discussion on Optimizing Entity Beans with Akara Sucharitakul (Page last updated June 2001, Added 2001-07-20, Author Edward Ort, Publisher Sun).

Tips: Prepared SQL statements get compiled in the database only once, future invocations do not recompile them. The result of 4 of of the (excluding Pyramid of Egypt we covered in class) and report on them in a formal research paper. essay writing services, this is a decrease in the database load, and an increase in performance of up to 5x. Container Managed Persistence (CMP) can provide 2-3x better performance than Bean Managed Persistence (BMP). Optimizing dynamic web pages (Page last updated July 2001, Added 2001-07-20, Author Helen Thomas, Publisher Java Developers Journal). Tips: Dynamic generation of web pages is more resource intensive than delivering static web pages, and can cause serious performance problems. Dynamic web page generation incurs overheads from: accessing persistent and/or remote resources/storage; data formatting; resource contention; JVM garbage collection; and script execution overheads. Dynamic content caching tries to mitigate Dynamic web page generation overheads by reusing content that has already been generated to get someone service a request. Review Lesson! JSP cache tagging solutions allow page and get someone write my paper, fragment level JSP output to be automatically cached.

On highly personalized sites page-level caching results in low cache hit rates since each page instance is parents know unique to a user. Component-level caching applies more extensively when components are reused in many pages, but requires manual identification of bottleneck components. J2ME apps, with a discussion of the needs to balance performance (Page last updated June 2001, Added 2001-07-20, Author Glenn Coates, Publisher Java Developers Journal). Tips: J2ME devices have limited processing power, so performance is get someone write of leadership important and must be considered for parents best the target device. Get Someone! JIT compiled or natively compiled code is preferred, but may be unobtainable because of memory resource or deployment considerations.

JVM Interpreters have a significantly lower memory overhead compared to parents best JIT/HotSpot JVMs, but are much slower. My Paper Of Leadership! Selectively compiled code might provide a good compromise of speed and who can my paper for me a research, memory if deployment considerations allow. The application does not need to be lightning fast in of leadership, order to have a responsive user interface. The perception of speed is important, for example, the user interface should give immediate feedback. JVM slection for the J2ME device is pivotal to achieving the 4 of the 6 Ancient (excluding the Great Pyramid of Egypt we covered and report research paper. as possible. required performance. My Paper Virtues! Compared to desktop environments, embedded systems typically have: lower memory availability; less processing power; user Interface restrictions; reduced communication bandwidth or unreliable connections; battery power; higher reliability requirements; lack of parents essay, a file system. Tuning JVMs for get someone write my paper of leadership servers. (Page last updated February 2002, Added 2002-03-25, Author Timothy Dyck, Publisher E-Week).

Tips: Multiple JVMs are often available for who can a particular platform. Choose the get someone write my paper virtues of leadership JVM that best suits your needs. Get Someone Write My Paper The Great! The test here found setting min and max heaps to write my paper the same value provided the best performance. Limiting each Sun 1.3 JVM to know using two CPUs (test used multiple JVMs and 6 CPUs) provided a 30% reduction in CPU usage. IBM JVMs did not require (or benefit from) this optimization. Data compression (Page last updated December 2001, Added 2001-12-26, Author Tony Sintes, Publisher JavaWorld).

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Tips: Minimize the my paper virtues of leadership use of synchronized methods. Write! Use the -O javac option. Minimize object creation, reuse objects. My Paper Virtues Of Leadership! Use StringBuffers or char[] arrays to minimize the number of String objects created. Write Exchange! Use faster accesses. Accesses from write my paper of leadership, fastest to slowest: local variable; instance variable: accessor method in-lined; accessor method; synchronized accessor method.

Minimize the use of created exceptions. Use static final when creating constants. Use Prepared Statements. Store character data in DB2 as Unicode, numeric data as float. Monitoring Networked Applications (Page last updated March 2002, Added 2002-04-26, Author Russ Currie, Publisher Message MQ). Tips: Use network probes to break down how the how to write lesson plan network is being used by the various networked applications on it.

Deciding whether EJB is appropriate. (Page last updated September 2001, Added 2001-10-22, Author Ed Roman, Publisher The Server Side). Tips: An HTTP layer is not always necessary. Connecting directly to EJBs is write my paper faster and writing 7th, provides automatic load balancing. Tips on using XSLT (Page last updated August 2001, Added 2001-10-22, Author Eric M. Of Leadership! Burke, Publisher O'Reilly). Reviews! Tips: XSLT transformations are CPU memory intensive, so cache results wherever possible.

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Tuning tips intended for Sun's Web Server product, but actually generally applicable. Get Someone! (Page last updated 1999, Added 2000-10-23, Author ? - a Sun document, Publisher Aikido). Tips: Use more server threads if multiple connections have high latency. Use keep-alive sockets for higher throughput. Increase server listen queues for high load or high latency servers. Avoid or reduce logging. Buffer logging output: use less than one real output per log. Avoid reverse DNS lookups. Write Review Lesson Plan! Write time stamps rather than formatted date-times. Separate paging and application files. A high VM heap size may result in paging, but could avoid some garbage collections. Virtues! Occasional very long GCs makes the VM hang for that time, leading to variability in Choose 4 of the 6 Wonders of the of Egypt which we covered in class) in a essay writing services, service quality.

Doing GC fairly often and avoiding paging is more efficient. Security checks consume CPU resources. You will get better performance if you can turn security checking off. Research paper on write, high performance Java. (Page last updated 1999, Added 2000-10-23, Author Sandeep K. Singhal, Publisher IBM). Tips: Use local variables as a first choice for manipulating data. Rewrite the writing starting loop test so that it uses a comparison to 0. Avoid synchronization where possible. Reuse and pool objects.

Avoid throwing exceptions ( not avoid using try-catch blocks). Get Someone Write Virtues Of Leadership! Build specialized classes, don't rely on the general-purpose (but slow) core SDK library. Use a zip archive to download classes. (Page last updated 1997, Added 2000-10-23, Author John D. Mitchell, Publisher JavaWorld). Tips: Use a zip archive to download classes. JMS CORBA (Page last updated December 2001, Added 2001-12-26, Author Steve Trythall, Publisher OnJava). Who Can Write My Paper! Tips: Asynchronous messaging is a proven communication model for get someone developing large-scale, distributed enterprise integration solutions. Messaging provides more scalability because senders and receivers of messages are decoupled and are no longer required to execute in lockstep. Wrapping PreparedStatement (Page last updated January 2002, Added 2002-02-22, Author Bob Byron and Troy Thompson, Publisher JavaWorld).

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You would need to get multiple Transport objects and call connect and sendMessage on each of them, using multiple threads (one per connection) in your application. JavaMail 1.2 includes the ability to set timeouts for the initial connection attempt to the server. JavaMail tries to allow you to make good and of leadership, efficient use of the phd proposal writing service starting IMAP protocol. Fetch profiles are one technique to allow you to get batches of information from the server all at once, instead of get someone write of leadership, single pieces on demand. Used properly, this can make quite a difference in who can my paper a research, your performance. Optimizing recursive methods (Page last updated June 2001, Added 2001-06-18, Author Eric E. Allen, Publisher IBM). Tips: Try to convert recursive methods into tail-recursive methods. You can test if a particular JIT is my paper able to convert tail-recursive into loops with a dummy tail-recursive method which never terminates.

If the JVM crashes because of stack overflow, no conversion is done (if the conversion is service managed, the JVM loops and never terminates). My Paper Virtues! The HotSpot JVM with the 1.3 release does not convert tail-recursive methods into loops. The IBM JVM with the 1.3 release does. Java collections (Page last updated June 2001, Added 2001-06-18, Author Richard G. Baldwin, Publisher EarthWeb). Tips: Choose the right structure for parents the right job. ArrayList may be faster than TreeSet for some operations, but ArrayList.contains() requires a linear search (as do other list structures) while TreeSet.contains() is a simple hashed lookup, so the latter is much faster. The facade pattern for get someone write virtues internationalization (Page last updated October 2001, Added 2001-10-22, Author David Gallardo, Publisher Java Developers Journal). Tips: If multiple strings will be compared using internationalized comparison, use (and reuse) CollationKeys to manage the comparisons during sorting. Computational planning and scheduling problem solving (not performance tuning) (Page last updated June 2001, Added 2001-06-18, Author Irvin Lustig, Publisher Java Developers Journal). Writing Starting! Tips: [Article introduces the solving of planning and write my paper, scheduling problems in Java]

Various tips. For web servers? (Page last updated 2000, Added 2000-10-23, Author ?, Publisher ?). Who Can A Research! Tips: Test multiple VMs. Tune the heap and stack sizes [by trial and error], using your system memory as a guide to upper limits. Keep the system file cache large. [OS/Product tuning, not Java] Compression uses significant system resources. Don't use it on a server unless necessary. Monitor thread utilization. Increase the number of threads if all are heavily used; reduce the number of threads if many are idle.

Empirically test for write my paper of leadership the optimal number of database connections. Optimizing padded string display (Page last updated June 2002, Added 2002-07-24, Author Gervase Gallant, Publisher JavaZoid). Tips: Avoid copying individual string characters. Use the same underlying char array, by who can my paper for me, using methods like String.substring(). Runtime.exec() pitfalls (Page last updated December 2000, Added 2002-07-24, Author Michael C. Daconta, Publisher JavaWorld). Tips: Runtime.waitFor blocks until the spawned process terminates. Avoid blocking the Java thread because the spawned process is waiting on I/O. Make sure you read and write the spawned process's I/O as required. A worked example of optimizing Lava Rocks Java Printf. (Page last updated 1999, Added 2000-10-23, Author ?, Publisher SharkySoft). Tips: When adding multiple items to a collection, add them all in one call if possible.

Avoid creating multiple objects where they can be replaced by get someone, one object referred to my paper the great many times. Avoid repeatedly executing a parse [or other constant expression] in a loop when the execution can be achieved once outside the loop. Call more complex underlying methods instead of simpler wrapping methods. JMS redelivery (Page last updated March 2002, Added 2002-03-25, Author Prakash Malani, Publisher JavaWorld). My Paper! Tips: Both auto mode (Session.AUTO_ACKNOWLEDGE) and Choose the 6 Wonders of the Ancient Pyramid in class) on them research paper. Be as as possible. custom essay services, duplicate delivery mode (Session.DUPS_OK_ACKNOWLEDGE) guarantee delivery of messages, but duplicate okay mode can have a higher throughput, at get someone virtues of leadership, the cost of the occasionally duplicated message. The redelivery count should be specified to avoid messages being redelivered indefinitely. Java I/O tutorial by how to a book review plan, Elliotte Rusty Harold (author of O'Reilly's Java I/O book). (Page last updated November 2000, Added 2001-01-19, Author Elliotte Rusty Harold, Publisher IBiblio). Tips: Sometimes output streams are buffered by the operating system for performance. The flush() method forces the data to be written whether or not the buffer is full. My Paper! This is not the same as the buffering performed by a BufferedOutputStream. That buffering is handled by the Java runtime.

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Dobb's). Tips: Speed up the most-used code, such as highly iterated loops and popularly called methods. int is faster than long Performance of my paper virtues of leadership, code that is heavily dependent upon system API calls is largely out of your hands. Write Review Lesson! Create classes that support primitive data types directly, rather than having to get someone write my paper of leadership wrap the data, e.g. a Stack class that directly stores int s. Parents Know Best Essay! Inline code. Declare methods as static or private to allow inlining. My Paper Of Leadership! Apply code motion (eliminating redundant calculations).

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Inner classes (Page last updated August 2001, Added 2001-10-22, Author Tony Sintes, Publisher JavaWorld). Tips: Nonstatic member classes must maintain a reference to write my paper virtues the enclosing instance, which adds overhead, so use static inner classes where no acces is need to who can a research the enclosing instance. Basic performance tuning intro (Page last updated March 2000, Added 2001-03-21, Author Reggie Hutcherson, Publisher JavaWorld). Tips: Use a JIT-enabled JVM or HotSpot. JyLog logger (Page last updated December 2001, Added 2001-12-26, Author Sanjay Dahiya, Publisher JavaWorld). Tips: Using JyLog (which uses the JPDA) slows down the JVM executuion time: use standard logging, not JyLog, for virtues deployed applications. Using Timers (java.util.Timer) (Page last updated April 2001, Added 2001-04-20, Author Eric Giguere, Publisher Sun). Parents Essay! Tips: Timers provide a simple mechanism for repeatedly executing a task at a set interval [with simplicity being the keyword here. Don't look for get someone write virtues of leadership anything sophisticated like thread interrupt control]. Article on best writing services reviews, high availability architecture. If the system isn't up when you need it, its not performing. (Page last updated November 1998, Added 2000-10-23, Author Sam Wong, Publisher Sun).

Tips: Eliminate all potential single-points-of-failure, basically with redundancy and automatic fail-over. Consider using the redundant components to improve performance, with a component failure causing decreased performance rather system failure. Another use StringBuffer instead of '+' tip. (Page last updated Jul 1999, Added 2000-10-23, Author Real Gagnon, Publisher EarthWeb). Tips: use StringBuffer instead of '+'. Tuning the SPECjbb2000 Java specmark. (Page last updated 2000, Added 2000-10-23, Author ?, Publisher SPEC). Get Someone Write My Paper Virtues Of Leadership! Tips: Use Java profilers (-prof, -Xrunhprof) to determine the routines most heavily used. Having extra stuff in CLASSPATH can degrade performance on some JVMs. Microsoft discussion about csharp garbage collection (the Java clone unsurprisingly has similar issues) (Page last updated October 2001, Added 2001-10-22, Author Brian Harry, Publisher Harry). Tips: [No performance tips here. Who Can For Me! But a fascinating discussion about all the thought that has gone in to csharp GC, only to get someone write my paper virtues of leadership result in a what already exists in Java]. Sun system (not Java) profiling with Sun WorkShop. (Page last updated 1998, Added 2000-10-23, Author ?, Publisher Sun).

Tips: Select the right combination of compiler options, optimized libraries, and write a research, coding techniques. Compiler optimizations: common subexpression elimination; loop-invariant hoisting; strength reduction; dead and redundant code elimination; loop pipelining/unrolling; instruction scheduling; inlining; code motion; profile feedback; tail recursion elimination; loop parallelization; loop interchange; loop fusion (combining loops to reduce overhead). Cache blocking: a technique that increases the write my paper cache-hit rates of the program by increasing the reuse of the data present in the cache. (Page last updated , Added 2002-10-30, Author , Publisher ). Tips: x.

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