分析JAVA应用CPU占用过高的问题

使用jstack分析java程序cpu占用率过高的有关问题
使用jstack分析java程序cpu占用率过高的问题
1，使用jps查找出java进程的pid，如3707

2，使用top -p 14292 -H观察该进程中所有线程的CPU占用。

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[root@cp01-game-dudai-0100.cp01.baidu.com ~]# top -p 14292 -H  

top - 22:14:13 up 33 days,  7:29,  4 users,  load average: 25.68, 32.11, 33.76  

Tasks: 113 total,   2 running, 111 sleeping,   0 stopped,   0 zombie  

Cpu(s): 68.3%us,  6.3%sy,  0.0%ni, 20.2%id,  0.1%wa,  0.2%hi,  4.9%si,  0.0%st  

Mem:  65965312k total, 65451232k used,   514080k free,    82164k buffers  

Swap:   975864k total,   972052k used,     3812k free,  9714400k cached  

  

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                                                         

15844 root      15   0 6889m 5.7g 4864 S 20.6  9.1 814:13.29 java                                                                                                                                                                            

15848 root      15   0 6889m 5.7g 4864 S 13.0  9.1 460:25.17 java                                                                                                                                                                            

15611 root      15   0 6889m 5.7g 4864 S 12.7  9.1 468:17.77 java                                                                                                                                                                            

15613 root      15   0 6889m 5.7g 4864 S 11.7  9.1 479:40.45 java                                                                                                                                                                            

15743 root      15   0 6889m 5.7g 4864 S 11.7  9.1 443:04.80 java                                                                                                                                                                            

15612 root      15   0 6889m 5.7g 4864 S 11.0  9.1 453:43.68 java                                                                                                                                                                            

15965 root      15   0 6889m 5.7g 4864 S 10.3  9.1 371:00.33 java                                                                                                                                                                            

15490 root      15   0 6889m 5.7g 4864 S  7.7  9.1 255:32.74 java                                                                                                                                                                            

15587 root      15   0 6889m 5.7g 4864 S  7.3  9.1 282:27.58 java                                                                                                                                                                            

15590 root      15   0 6889m 5.7g 4864 S  7.3  9.1 205:48.37 java                                                                                                                                                                            

15491 root      15   0 6889m 5.7g 4864 R  6.3  9.1 279:09.08 java                                                                                                                                                                            

15689 root      15   0 6889m 5.7g 4864 S  5.7  9.1 251:42.36 java                                                                                                                                                                            

16935 root      15   0 6889m 5.7g 4864 S  5.7  9.1 190:34.37 java                                                                                                                                                                            

15665 root      15   0 6889m 5.7g 4864 S  5.3  9.1 250:07.34 java                                                                                                                                                                            

16920 root      15   0 6889m 5.7g 4864 S  5.3  9.1 241:34.50 java                                                                                                                                                                            

15671 root      15   0 6889m 5.7g 4864 S  5.0  9.1 239:49.97 java                                                                                                                                                                            

15492 root      15   0 6889m 5.7g 4864 S  4.7  9.1 210:23.09 java                                                                                                                                                                            

14322 root      16   0 6889m 5.7g 4864 S  4.3  9.1 107:39.61 java                                                                                                                                                                            

14316 root      16   0 6889m 5.7g 4864 S  4.0  9.1 107:18.43 java                                                                                                                                                                            

14317 root      16   0 6889m 5.7g 4864 S  4.0  9.1 107:29.13 java                                                                                                                                                                            

15591 root      15   0 6889m 5.7g 4864 S  4.0  9.1 114:34.90 java                                                                                                                                                                            

14313 root      16   0 6889m 5.7g 4864 S  3.7  9.1 107:12.70 java                                                                                                                                                                            

14314 root      15   0 6889m 5.7g 4864 S  3.7  9.1 107:28.05 java                                                                                                                                                                            

14319 root      16   0 6889m 5.7g 4864 S  3.7  9.1 107:27.43 java                                                                                                                                                                            

14321 root      15   0 6889m 5.7g 4864 S  3.3  9.1 108:01.12 java                                                                                                                                                                            

15589 root      15   0 6889m 5.7g 4864 R  3.0  9.1 109:01.91 java                                                                                                                                                                            

15615 root      15   0 6889m 5.7g 4864 S  3.0  9.1 114:55.29 java                                                                                                                                                                            

16808 root      15   0 6889m 5.7g 4864 S  2.7  9.1 279:05.03 java                                                                                                                                                                            

14315 root      15   0 6889m 5.7g 4864 S  2.0  9.1 107:45.00 java                                                                                                                                                                            

14320 root      15   0 6889m 5.7g 4864 S  2.0  9.1 107:48.30 java                                                                                                                                                                            

15489 root      15   0 6889m 5.7g 4864 S  1.7  9.1  57:38.46 java                                                                                                                                                                            

15670 root      15   0 6889m 5.7g 4864 S  1.3  9.1   5:55.43 java                                                                                                                                                                            

14318 root      15   0 6889m 5.7g 4864 S  0.7  9.1 107:45.88 java                                                                                                                                                                            

14826 root      15   0 6889m 5.7g 4864 S  0.7  9.1  25:07.64 java    

3，找出CPU消耗较多的线程id，如15844，将15844转换为16进制0x3de4，注意是小写哦
4，使用jstack 14292|grep -A 10 0x3de4来查询出具体的线程状态。

 

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[root@cp01-game-dudai-0100.cp01.baidu.com ~]# jstack 14292|grep -A 10 0x3de4  

"pool-52-thread-1" prio=10 tid=0x000000005a08e000 nid=0x3de4 waiting on condition [0x00002ae63d917000]  

   java.lang.Thread.State: WAITING (parking)  

        at sun.misc.Unsafe.park(Native Method)  

        - parking to wait for  <0x00000006f9a0a110> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)  

        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)  

        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)  

        at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)  

        at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)  

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)  

        at java.lang.Thread.run(Thread.java:662)  

通过这些线程状态便可基本定位问题之所在。