java memory profiling tools

classes. In addition, there are duplicate classes functions, but also to assist in the analysis of repeated loading of the class, here is no longer, it is certain that Myabsclass was repeatedly loaded n times. Last In fact, the mat tool is very powerful, the above-mentioned example code does not use the other MAT analysis function, so it is no longer described. In fact, for Oom not only I enumerated two kinds of overflow errors, there are a number of other errors, but I want to say, for P

the ClassLoader itself can associate many classes and their static fields, there is a lot of memory being leaked. Determine the location of the leak The first sign of a memory leak is that there is a outofmemoryerror in the application. This usually happens in the production environment that you least want it to happen, and debugging is almost impossible at this point. It is possible that the test environm

can use the command "Jmap" to obtain heap dump, with "jhat" to analyze heap dump. 7, Java heap space is different from stack space, stack space is used to store call stacks and local variables. 8. The Java garbage collector is used to reclaim memory from dead objects (objects that are no longer used) and then to release them into the

the JVM. When we create objects, they are stored in the Java heap memory. To facilitate garbage collection, the Java heap space is divided into three zones, called New Generation, old Generation or tenured Generation, and perm space. You can resize the Java heap space by using the Jvm's command-line Opt

under the Windows platform, in addition to the-dump options for generating dump files and the-histo options for viewing instances of each class, and the spatial occupancy statistics that are available on all operating systems. The remaining options are only available under Linux and Solaris systems.JMAP command formatjmap [option] VmidJmap Tools Main Options Options Role -dump Generates a

the Windows platform, in addition to the-dump options for generating dump files and the-histo options for viewing instances of each class, and the spatial occupancy statistics that are available on all operating systems. The remaining options are only available under Linux and Solaris systems.JMAP command formatjmap [option] VmidJmap Tools Main Options Options Role -dump Generates a

How to use Jconsole to observe and analyze the operation of Java program, and to perform debugging and tuninghttp://jiajun.iteye.com/blog/810150How to use JVISUALVM for performance analysishttp://jiajun.iteye.com/blog/1180230Full-featured Java Profiling tool (Profiler)Http://www.blogjava.net/mrzhangshunli/archive/2007/08/27/140088.htmlHttp://www.cnblogs.com/jayze

VisualVM is a free, integrated visualization tool that integrates multiple JDK command-line tools to provide you with powerful analytical capabilities for performance analysis and tuning of Java applications. These features include generating and analyzing massive amounts of data, tracking memory leaks, monitoring the garbage collector, performing

Java/io/file 788 1 java/io/file jmap Jmap-dump:format=b,file=dump.bin PID Jmap can obtain a specific memory match from a core file or process, including heap size, Perm size, and so on, which is only available in the Solaris and Linux JDK versions. Observe the physical memory footprint of a running JVM Prints out the

disappointed with the performance of J2EE applications. Therefore, we need some tools and investigation strategies to help the J2EE development team solve these performance problems. This is the problem to be solved by Quest JProbe Profiler and Jprobe Memory Debugger. | YourKitYourKit Java Profiler is an industry-leading Ja