jmap是java 7后自带的轻量级内存分析工具，原文介绍可以见官网，《The jmap Utility》

1 堆栈分析

获取GC算法，新生代，老年代，永久代空间占用分析
jmap -heap 29620
Attaching to process ID 29620, please wait...
Debugger attached successfully.
Client compiler detected.
JVM version is 1.6.0-rc-b100[......]

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