前言

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大家都知道有很多开源的监控工具，本次只使用了jmap，了解简单使用，谢谢，下面话不多说了，来一起看看详细的介绍吧

使用方法如下：

开始了，922是我的tomcat进程

帮助命令查看，有哪些命令可以使用。

[root@bogon /]# jmap -help
Usage:
 jmap [option] 
  (to connect to running process)
 jmap [option] 
  (to connect to a core file)
 jmap [option] [server_id@]
  (to connect to remote debug server)

where  is one of:
     to print same info as Solaris pmap
 -heap    to print java heap summary
 -histo[:live]  to print histogram of java object heap; if the "live"
       suboption is specified, only count live objects
 -clstats    to print class loader statistics
 -finalizerinfo  to print information on objects awaiting finalization
 -dump: to dump java heap in hprof binary format
       dump-options:
       live   dump only live objects; if not specified,
          all objects in the heap are dumped.
       format=b  binary format
       file= dump heap to 
       Example: jmap -dump:live,format=b,file=heap.bin 
 -F     force. Use with -dump:  or -histo
       to force a heap dump or histogram when  does not
       respond. The "live" suboption is not supported
       in this mode.
 -h | -help   to print this help message
 -J    to pass  directly to the runtime system

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