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一、jps 查询正在运行的虚拟机进程。

-m输出虚拟机进程启动时传递给main()函数的参数

-l输出进程执行的主类的全名

-v输出虚拟机进程启动时的JVM参数 

二、jinfo 查看虚拟机配置参数信息

三、jstack 生成java虚拟机当前时刻的线程快照

-F：当正常输出请求不被响应时，强制输出线程栈堆。

-l：显示关于锁的附加信息。

-m：显示本地方法栈

四、jmap 生成虚拟机内存转储快照

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
                 
                
               
              
             
            
           
          
         
        
      
     
    
   

五、jhat 分析 Jmap 产生的堆复制文件

jhat -J-Xmx512m heap.dmp

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