快速找到Tomcat中最耗CPU的线程

1、找出TOMCAT的JVM的进程ID

[work@112542000 ~]$ jps                                                                                                                                         
290 Bootstrap                                                                                                                                                   
61213 Jps                                                                                                                                                       

2、查看该进程中，最耗费CPU的线程

[work@112542000 ~]$ ps -mp 290 -o THREAD,tid,time | sort -k2 -r | head -n 20                                                                                    
USER     %CPU PRI SCNT WCHAN  USER SYSTEM   TID     TIME                                                                                                        
work     15.3   -    - -         -      -     - 03:11:58                                                                                                        
work      1.2  19    - -         -      -   326 00:15:45                                                                                                        
work      0.2  19    - -         -      -   872 00:03:44                                                                                                        
work      0.1  19    - -         -      -   992 00:01:44                                                                                                        
work      0.1  19    - -         -      -   972 00:01:16                                                                                                        
work      0.1  19    - -         -      -   870 00:01:19                                                                                                        
work      0.1  19    - -         -      -   869 00:01:34                                                                                                        
work      0.0  19    - -         -      -  9993 00:00:00                                                                                                        
work      0.0  19    - -         -      -   997 00:00:06                                                                                                        
work      0.0  19    - -         -      -  9969 00:00:00                                                                                                        
work      0.0  19    - -         -      -  9968 00:00:00                                                                                                        
work      0.0  19    - -         -      -   996 00:00:34                                                                                                        
work      0.0  19    - -         -      -  9960 00:00:00                                                                                                        
work      0.0  19    - -         -      -   995 00:00:00                                                                                                        
work      0.0  19    - -         -      -  9944 00:00:00                                                                                                        
work      0.0  19    - -         -      -   994 00:00:31                                                                                                        
work      0.0  19    - -         -      -  9936 00:00:00                                                                                                        
work      0.0  19    - -         -      -  9934 00:00:26                                                                                                        
work      0.0  19    - -         -      -  9933 00:00:21                                                                                                        

3、以TID==326为例，查看该线程的堆栈

首先，将十进制的326转换成十六进制，可以在线转换：

http://tool.oschina.net/hexconvert

结果等于146

使用jstack查询该线程堆栈：

[work@112542000 ~]$ jstack 290 | grep "0x160" -A 10                                                                                                             
"Timer-2955" daemon prio=10 tid=0x00007f39d3ecd000 nid=0x1602 in Object.wait() [0x00007f38fb273000]                                                             
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       
        - locked <0x00000007c2a0fc40> (a java.util.TaskQueue)                                                                                                   
        at java.util.TimerThread.run(Timer.java:505)                                                                                                            

"Timer-2954" daemon prio=10 tid=0x00007f392481e000 nid=0x15e4 in Object.wait() [0x00007f38fbe7f000]                                                             
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       
--                                                                                                                                                              
"Timer-2132" daemon prio=10 tid=0x00007f39d367d000 nid=0x1603 in Object.wait() [0x00007f3933f46000]                                                             
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       
        - locked <0x00000007b44ef3c8> (a java.util.TaskQueue)                                                                                                   
        at java.util.TimerThread.run(Timer.java:505)                                                                                                            

"Timer-2131" daemon prio=10 tid=0x00007f39d3b61800 nid=0x15e6 in Object.wait() [0x00007f3934d54000]                                                             
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       
--                                                                                                                                                              
"Timer-450" daemon prio=10 tid=0x00007f39d0728800 nid=0x160 in Object.wait() [0x00007f39b1312000]                                                               
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       
        - locked <0x00000007bddf8788> (a java.util.TaskQueue)                                                                                                   
        at java.util.TimerThread.run(Timer.java:505)                                                                                                            
                                                                                                                                                                
"Timer-449" daemon prio=10 tid=0x00007f39ec01f000 nid=0xffc7 in Object.wait() [0x00007f39af5f5000]                                                              
   java.lang.Thread.State: TIMED_WAITING (on object monitor)                                                                                                    
        at java.lang.Object.wait(Native Method)                                                                                                                 
        at java.util.TimerThread.mainLoop(Timer.java:552)                                                                                                       

参考资料：

http://scau-fly.iteye.com/blog/1884606

http://www.blogjava.net/hankchen/archive/2012/05/09/377735.html

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