top命令找到佔用CPU最高的java線程

參考 http://lxiaodao.iteye.com/blog/1413774

和長源

28147是java的進程號，通過jps命令查出來的

top -Hp 28174 -d 1 -n 1  

查出占CPU最高的線程

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                          20765 admin     22   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20766 admin     18   0 1628m 1.3g  15m S  0.0 17.5   0:00.62 java                                                                             20767 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:27.16 java                                                                             20768 admin     16   0 1628m 1.3g  15m S  0.0 17.5   0:27.40 java                                                                             20769 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:27.77 java                                                                             20770 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:27.52 java                                                                             20771 admin     16   0 1628m 1.3g  15m S  0.0 17.5   0:27.63 java                                                                             20772 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:15.18 java                                                                             20773 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20774 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20775 admin     19   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20776 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:11.21 java                                                                             20777 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:09.81 java                                                                             20778 admin     25   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20779 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20783 admin     15   0 1628m 1.3g  15m S  0.0 17.5   0:00.03 java                                                                             20784 admin     19   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20785 admin     20   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java                                                                             20786 admin     21   0 1628m 1.3g  15m S  0.0 17.5   0:00.00 java 

20766是最耗CPU的線程，轉換成16進位511e，再用jstack命令查看線程堆棧

[admin@v022067 ~/logs]$ jstack -l 20765 | grep 511e -A 20     "DestroyJavaVM" prio=10 tid=0x00002aaab4268800 nid=0x511e waiting on condition [0x0000000000000000]   java.lang.Thread.State: RUNNABLE   Locked ownable synchronizers:        - None"pool-3-thread-1" prio=10 tid=0x00002aaab4344000 nid=0x5138 waiting on condition [0x00000000428ad000]   java.lang.Thread.State: WAITING (parking)        at sun.misc.Unsafe.park(Native Method)        - parking to wait for  <0x00000000c01259f0> (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)   Locked ownable synchronizers:        - None"main-EventThread" daemon prio=10 tid=0x0000000043bce800 nid=0x5137 waiting on condition [0x00000000427ac000]