如何获取java heap dump

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vaporz 2011-10-26 14:16:34 博主文章分类：收藏_java

文章标签 java print running 如何 process 文章分类 Java 后端开发

转自：http://blog.csdn.net/linghunhong/article/details/6451220

如何获取java heap dump

2010-06-25 12:43

C:/Program Files/Java/jdk1.6.0_20/bin>jmap
Usage:
jmap -histo <pid>
(to connect to running process and print histogram of java object heap
jmap -dump:<dump-options> <pid>
(to connect to running process and dump java heap)

dump-options:
format=b binary default
file=<file> dump heap to <file>

Example: jmap -dump:format=b,file=heap.bin <pid>

或者，运行jconsole, 选择 MBeans -> com.sun.management -> HotSpotDiagnostic -> Operations -> dumpHeap 在参数p0中填写保存dump文件的路径，如果要使用Eclipse Memory Analyzer来分析则文件的后缀要为hprof。点击dumpHeap按钮生成dump文件。

或者在Eclipse Memory Analyzer中直接生成
如何获取java heap dump _如何

或者，设置jvm让其在out of memory的时候自动生成dump文件: -XX:+HeapDumpOnOutOfMemoryError 或者-XX:+HeapDumpOnCtrlBreak，更多设置见http://wiki.eclipse.org/index.php/MemoryAnalyzer#Getting_a_Heap_Dump

附带一句，dump文件可以使用Eclipse Memory Analyzer
http://dev.eclipse.org/blogs/memoryanalyzer/2008/04/21/immortal-objects-or-how-to-find-memory-leaks/
http://wiki.eclipse.org/index.php/MemoryAnalyzer#Finding_Memory_Leaks

Finding Memory Leaks

Start by running the leak report to automatically check for memory leaks.
This blog details How to Find a Leaking Workbench Window.
The Memory Analyzer grew up at SAP. Back then, Krum blogged about Finding Memory Leaks with SAP Memory Analyzer. The content is still relevant!