java performance tuning tips

capture and processing is very resource-intensive for Java applications, and program Gaoping rate for exception handling database: Most applications do not need databases, and massive database reads and writes can be time consuming lock contention: for highly concurrent programs, lock contention increases thread switching overhead if there is intense competition Memory: in general, as long as the application is designed properly, memory r

After using the Lightroom for a period of time, feel more and more slowly, or because of a wide range of work, hoping to improve the efficiency of LR? Here are 10 tips from the founder of SLR Lounge, a foreign website, without installing programs that can directly enhance the speed and efficiency of LR software (for reading convenience, Order of Change slightly): 　　(i) Increased speed of pick-up (cache) To edit–> preference, in the pop-u

JvmThe correct use of the JVM parameter configuration parameters running in the Jee container is directly related to the performance and processing capability of the whole system, and the tuning of the JVM is mainly for the tuning of memory management, and the direction of optimization is divided into the following 4 points:The size of the 1.HeapSize heap, or the

function. In some cases, you can use the isset () technique to accelerate your code execution.(For example)If (strlen ($ foo) (Compare with the following tips)If (! Isset ($ foo {5}) {echo "Foo is too short" $}Calling isset () happens to be faster than strlen (), because unlike the latter, isset () is used as a language structure, this means that function search and lowercase letters are not required for execution. That is to say, in fact, you do not

,styles, and programming Tips". Author: Chris Laffra. Prentice Hall was published in 1997 (Java 1.0). 11th Chapter 20th subsection. d.4.5 General Books[12] Structures and C Programs (data structure and C program). Author: J.van Wyk. Addison-wesly published in 1998.[13] "Writing Efficient Programs" (write a valid procedure). Author: Jon Bentley. Prentice Hall was published in 1982. Special Reference p.110 an

go through a number of steps, such as lowercase letters, PHP is case-insensitive, and hash lookups follow the functions that are called. In some cases, you can use the isset () technique to speed up the execution of your code.(Examples below)if (strlen ($foo) (compare with the following tips)if (!isset ($foo {5})) {echo "Foo is too Short" $$}Calling Isset () happens to be faster than strlen (), because unlike the latter, Isset () as a language struct

possible to insert, update operation (on the update, I was a bad batch);46, as far as possible to use PHP intrinsics (but I have to find a php non-existent function, waste can write a custom function of time, experienceProblem!);47, the loop inside do not declare variables, especially large variables: objects (this does not seem to be the only thing in PHP to pay attention to it?);48, multidimensional arrays try not to loop nested assignment;49, in the case of PHP internal string manipulation f

Skills | Performance 19: Using the browser's validation capabilities Today's browsers provide support for advanced features such as XML, DHTML, Java applets, and remote Data services. Use these features whenever possible. All of these technologies can perform client-side validation and data caching, eliminating round-trip to the WEB server. If you are running a smart browser, the browser can do some validat

section) This is mainly about two pieces of content: Web-related, EE-related technologiesWeb Part:Out of all languages, purely web-related: Html,css,javascript. Even if you do not use Java development, in C #, PHP, or python, these things are generic, here the main emphasis on some basic knowledge. HTTP protocol, HTTPS protocol I think that doing web development, HTTP is the basis of the foundation. In the beginning, the developer

for Java performance More concerned about the students probably know the "Java performance" this book, in general, many students in the daily writing Java Code is seldom to care about performance issues, but in the process of writ

; Synchronization is a major performance bottleneck Through monitoring, it is found that a large number of thread blocks are in a synchronous method, so that the cpu is not busy. When you find that performance is not good, IO, network, and other slow devices are not a problem, you have to check whether synchronizae is used at a critical point ). Sometimes some method in the third-party jar of your applica

, and also prevents the MVCC cleanup process from reclaiming old tuples or index entries that are no longer needed.Submission Date/time not that easyThere are two very complicated things in programming:Processing encodingWorking with dates/times across multiple time zonesTo solve the second problem, it is a good idea to save all timestamps in the UTC time zone. However, when using MySQL, you also need to set the Uselegacydatetimecode JDBC driver configuration property to False.ConclusionAs you c

increase the number of valid data accesses. This is more difficult than I-Cache Optimization. The following is a list of code optimization tips that need to be constantly supplemented, optimized, and filtered. 1) code adjacency (put the relevant code together), recommendation index: 5 stars Put the relevant code together has two meanings: first, the relevant source files should be put together; second, the related functions should also be adjacent in

you have received and click on the link to the SQL statement that you are interested in, which will take you from the Java EE side to the database side. Now you are looking at the SQL statements in the Oracle database or other database product environment. The tool may help you identify database-side problems and may provide some professional tuning recommendations that database administrators (DBAs) can u

not run at all, so it does not affect performance. In addition, in some JVMs-such as the Jrockit--jit compiler can even decompose operations on objects so that even if the code path is still valid, the allocation operation can be avoided. The implication here is that contexts are important when dealing with Java performance problems, and premature optimization

Some time ago in the performance analysis of the company's projects, from a simple analysis of log (GC log, postgrep log, Hibernate statitistic), through the AOP to collect software running data, to pet testing, feel time spent a lot, performance also has a certain increase, But it always feels like working in primitive times, unable to be simple and smooth, and to achieve the desired result with great clar

used to detect deadlock problems.For more documentation and examples of use of these tools, refer to resources.ConclusionThe Java 6 platform provides some enhancements to VM testing, management APIs, and JDK tools to help effectively identify and diagnose performance and memory problems in Java applications. This article describes the enhancements added to the

Java application. Therefore, instead of using the form used in parts 2nd and 3rd, this article focuses on finding the information needed to complete the optimization effort. Therefore, this article provides only a small number of tips, but we want to combine the overall performance tool discussion with a handful of tips