java profiling tutorial

not improve efficiency, but will reduce efficiency, because there is a lock upgrade process, this time will need to-xx:-usebiasedlocking to disable the biased lock. Here are the comparison of these types of locks: Lock Advantages Disadvantages Applicable scenarios Biased lock Locking and unlocking does not require additional consumption, and the execution of a non-synchronous method is less than the nanosecond-level gap. If there

("Fromrealsubject");}}publicclass proxysubjectextendssubject{privaterealsubjectrealsubject; The //proxy role internally references the real role @Override public voidrequest () {prerequest (); // Actions that are attached before a real-world role Operation if (Null==realsubject) { realsubject=newrealsUbject ();} Realsubject.request (); //true character completion postrequest (); //actions attached after a real-world role Operation } privatevoidprerequest () {system.out.println (" Prerequest

Commercial:ANTS Memory Profiler:http://www.red-gate.com/products/dotnet-development/ants-memory-profiler/ANTS Performance Profiler:http://www.red-gate.com/products/dotnet-development/ants-performance-profiler/NET Memory profiler:http://memprofiler.com/JetBrains dottrace:http://www.jetbrains.com/profiler/download/index.htmlSciTech Memory profiler:http://www.scitech.se/Free:CLR profiler:http://msdn.microsoft.com/en-us/magazine/ee309515.aspxSOS Debugging Extension:http://msdn.microsoft.com/en-us/li

Original article: Http://www.infoq.com/cn/news/2011/08/jprofiler7 J-Technologies Co., Ltd. released jprofiler 7.0 some time ago. Jprofiler is a Java SE/EE profiling tool that features CPU analysis, memory analysis, thread analysis, and Vm telemetry. New Features of version 7.0 include: Analyze the built-in probes for JDBC, JMS, JNDI, Servlet, files, sockets, and processes. You can use the API to customi

without first checking. A typical example of the Set method is the Unlock () method in the lock class. A thread holding a lock is always able to unlock successfully without checking that the lock is in an unlocked state.The program flow of the set method is usually as follows: Set internal state Notifies the waiting thread Here is an example of the Unlock () method: Public class lock{ Privatebooleanfalse; Public synchronized void unlock () { false; Notify (

the listThere are at least three ways to traverse after JDK1.5: ForEach, iterator, for loop.Package Bupt.xiaoye.charpter2.list;import Java.util.arraylist;import Java.util.iterator;import java.util.List; public class Testfor {public static void Testforeach (List list) {Object Temp;for (object t:list) temp = t;} public static void Testfor (List list) {Object temp;for (int i = 0; i The result of the operation is:As you can see, the direct for loop is the most efficient, followed by iterators and f

Gen, which can be shorter on pause times. Use-XX:+USEPARALLELOLDGC to enable parallel compacting Collector in the JVM startup parameters. Concurrent mark-sweep (CMS) Collector: The concurrency flag clears the garbage collector, for young Gen uses the same garbage collection strategy as parallel Collector, for tenured Gen, Garbage-collected garbage-flagged threads are at the same time as the application thread, while garbage removal requires suspending the application thread, but the pause

Java tutorial translation Sequence Java Introduction Build a JSE development environment-install JDK and eclipse Language basics Java Hello World Program Analysis Variable Java Variables Java Native type Conversion of

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