java performance tuning and optimization

each Java application Server has a lot of configuration items. Here is a brief introduction to some of the most common performance optimization configuration projects. Many application servers have operating system configuration items or non-standard features related to the Java EE specification, which can improve sy

Summary of Java code Performance Optimization Preface Code optimization is a very important topic. Some people may think it is useless. In some small places, what are the effects of modifying or not modifying the code on the code running efficiency? I think so. Is it useful to eat a small shrimp like a whale in the se

Java performance optimization tips I. General1.1 create a class instance without the New Keyword1.2 use non-blocking I/O1.3 usage exceptions with caution1.4 do not reinitialize the variable1.5 specify the final modifier of the class as much as possible1.6 use local variables whenever possible1.7 multiplication and divisionIi. J2EE2.1 use a buffer flag2.2 always a

it is:publicstatic void Main (string[] args) {HashMap hm =newhashmap (); Hm.put ("111", "222"); set> EntrySet = Hm.entryset ();iterator> iter = Entryset.iterator (); while (Iter.hasnext ()) {Map.entry Entry = Iter.next (); System.out.println (Entry.getkey () + "\ T" + entry.getvalue ());}}If you just want to traverse the key value of this map, use "Set KeySet = Hm.keyset ();" would be more appropriate.35, the close () to the resources proposed separate operationIt means, for example, that I hav

, when the performance problem becomes the system principal contradiction, the unfolding cycle is definitely a technique worth trying.8. Boolean operation instead of bitwise operation Although bit operations are much faster than arithmetic operations, using bitwise operations instead of Boolean operations is a very bad choice when it comes to conditional judgment. When the condition is judged, Java makes a

Preface Code optimization, a very important topic. Some people may feel useless, some small places have what good to modify, and do not change the operation of the Code to the efficiency of what impact it. This question I think so, like the whale in the sea, it is useful to eat a small shrimp. No use, but after eating a lot of shrimp, the whale is fed. The same is true with code optimization, if the projec

thickness of the arrow lines indicates the amount of data. In a graphical execution plan, each of the different operators has its own property values, and we can move the mouse over the operator icon to view Of course, you can also right-click on the icon, view the properties, go to the Properties panel and view more detailed property values The detailed indicator values for each operator in this case are described later, but there are a few key values here, which can be said to mention a lit

Build high performanceASP. NETSite Chapter 5-Performance Tuning Overview (previous) During this time, the seriesArticleI reorganized it. The previous introduction to performance optimization was not very clear. It can be said that starting from this article, it is the beginning of a complete series. Links to a

Comparison of Java toString Performance Optimization Solutions Who cares about toString performance? No one! Unless you have a large amount of data in batch processing, using toString produces a lot of logs. Then, when you investigate why it is so slow, you will realize that most toString methods use introspection, wh

the Integer.tostring () method at the bottom, but it will be bearish before the call2, Integer.tostring () method will not say, directly called the3, i + "" bottom using StringBuilder implementation, first with the Append method splicing, and then use the ToString () method to get the stringIn contrast, the three are clearly 2 fastest, 1 times, 3 slowest34. Use the most efficient way to traverse the mapThere are many ways to traverse a map, and the most common scenario we need is to traverse th

Complete the same function, with different code to achieve, there may be a large difference in performance, so for some performance-sensitive modules, it is necessary to optimize the code. Today, let's talk about Java code optimization, and today we're going to focus on optimizations for the for (while and so on) loops

Linux server performance tuning skills, linux Server TuningPerformance tuning skills for 20 Linux servers Guide Linux is an open-source operating system that supports various hardware platforms. Linux servers are world-renowned. The main difference between Linux and Windows is that, by default, a Linux server does not provide a GUI (graphical user int

() {returnReflectiontostringbuilder.tostring ( This);}//Average Performance with JMH (OPS/S)//(min, avg, max) = (14172,485, 23204,479, 30754,901)//average performance measured using the JMH//(min, avg, max) = (14172,485, 23204,479, 30754,901)SummarizeNow with JVM optimizations, we can safely use the + to concatenate strings (and use objects.tostring to handle null). With a utility class built into the JDK,

improve performance. This is the default setting of True.Connectionlinger: The number of seconds to close when this connector will continue to use the socket. The default value is-1, which disables the socket delay time.Server: Hide Tomcat version information, first hide version information in HTTP header 6. Hide or modify the Tomcat version number # cd/usr/local/tomcat/lib/# Unzip Catalina.jar # CD Org/apache/catalina/util # VIM Serverinfo

GAE Java Application Performance Optimization Reprint please retain the author information: Author: 88250 Date: February 8, 2011 This article is the author of the development of GAE application performance optimization experience, mainly from the framework, caching, asynch

Before finishing a Java Performance optimization blog, Link Java performance optimization One, today to add a few1. Take care of the cyclic traversal of JavaA list traversal in Java can

) { //exits the loop without an exchange; Break; }} System.out.println (Arrays.tostring (arr)); }}Bubble sort second optimization (Inner loop optimization) /*** Bubble sequencing performance analysis and algorithm optimization (inner loop optimi