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使用Arthas thread命令查看线程堆栈

java 本文总阅读量次

Arthas thread命令介绍

https://alibaba.github.io/arthas/thread.html

查看当前Java进程的线程信息和线程的堆栈信息。

使用方法

命令格式：

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thread [id] [-n 5]

示例：

显示所有线程的信息

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$ thread
Threads Total: 16, NEW: 0, RUNNABLE: 7, BLOCKED: 0, WAITING: 5, TIMED_WAITING: 4, TERMINATED: 0
ID         NAME                             GROUP                 PRIORITY   STATE      %CPU       TIME       INTERRUPTE DAEMON
30         as-command-execute-daemon        system                9          RUNNABLE   72         0:0        false      true
23         as-session-expire-daemon         system                9          TIMED_WAIT 27         0:0        false      true
22         Attach Listener                  system                9          RUNNABLE   0          0:0        false      true
11         pool-2-thread-1                  main                  5          TIMED_WAIT 0          0:0        false      false
12         Thread-2                         main                  5          RUNNABLE   0          0:0        false      true
13         pool-3-thread-1                  main                  5          TIMED_WAIT 0          0:0        false      false
25         as-selector-daemon               system                9          RUNNABLE   0          0:0        false      true
14         Thread-3                         main                  5          TIMED_WAIT 0          0:0        false      false
26         pool-5-thread-1                  system                5          WAITING    0          0:0        false      false
15         Thread-4                         main                  5          RUNNABLE   0          0:0        false      false
1          main                             main                  5          WAITING    0          0:2        false      false
2          Reference Handler                system                10         WAITING    0          0:0        false      true
3          Finalizer                        system                8          WAITING    0          0:0        false      true
4          Signal Dispatcher                system                9          RUNNABLE   0          0:0        false      true
20         NonBlockingInputStreamThread     main                  5          WAITING    0          0:0        false      true
21         Thread-8                         main                  5          RUNNABLE   0          0:0        false      true

显示指定线程的运行堆栈

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$ thread 1
"main" Id=1 WAITING on java.util.concurrent.CountDownLatch$Sync@29fafb28
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.CountDownLatch$Sync@29fafb28
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
    at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)

显示当前最忙的前N个线程并打印堆栈

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thread -n 3
"as-command-execute-daemon" Id=29 cpuUsage=75% RUNNABLE
    at sun.management.ThreadImpl.dumpThreads0(Native Method)
    at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
    at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)
    at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)
    at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)
    at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
 
    Number of locked synchronizers = 1
    - java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8
 
"as-session-expire-daemon" Id=25 cpuUsage=24% TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)
 
"Reference Handler" Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@69ba0f27
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.Reference$Lock@69ba0f27
    at java.lang.Object.wait(Object.java:503)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
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