thread

查看线程、线程堆栈信息

命令选项

命令选项	描述
--all	查看所有线程
-b, --include-blocking-thread	查看死锁线程
--lockedMonitors	包含监视器锁(synchronized)信息
--lockedSynchronizers	包含ReentrantLock和ReentrantReadWriteLock锁信息
-i, --sample-interval <number>	刷新cpu频率(ms)
--state <value>	查看指定线程状态的线程
-n, --top-n-threads <number>	根据cpu排序，查看前n根线程堆栈
-h, --help	帮助
<id>	查看指定线程id的堆栈

列描述说明

参考dashboard中THREAD部分说明

列名	说明
ID	线程id
NAME	线程名
GROUP	现场组名
PRIORITY	优先级
STATE	线程状态
%CPU	CPU占用率
DELTA_TIME	上次采样之后线程运行增量CPU时间，数据单位秒
TIME	线程运行总CPU时间，格式分:秒
INTERRUPTED	线程当前的中断位状态
DAEMON	是否守护线程

线程状态

• RUNNABLE
• BLOCKED
• WAITING
• TIMED_WAITING
• NEW
• TERMINATED

示例

# 查看所有线程
[arthas@10580]$ thread
2      Reference Handler                          system                10            WAITING       0.0            0.000         0:0.000       false          true
3      Finalizer                                  system                8             WAITING       0.0            0.000         0:0.031       false          true
4      Signal Dispatcher                          system                9             RUNNABLE      0.0            0.000         0:0.000       false          true
5      Attach Listener                            system                5             RUNNABLE      0.0            0.000         0:0.031       false          true
...
1      main                                       main                  5             TIMED_WAITING 0.0            0.000         0:0.390       false          false
25     RMI TCP Connection(1)-127.0.0.1            RMI Runtime           5             RUNNABLE      0.0            0.000         0:0.328       false          true
99     RMI TCP Connection(367)-127.0.0.1          RMI Runtime           5             RUNNABLE      0.0            0.000         0:0.203       false          true
104    RMI TCP Connection(366)-127.0.0.1          RMI Runtime           5             RUNNABLE      0.0            0.000         0:0.046       false          true

# 查看指定状态的线程
[arthas@10580]$ thread --state RUNNABLE

# 查看阻塞线程堆栈
[arthas@10580]$ thread -b
No most blocking thread found!

# 查看占用cpu前N线程
[arthas@10580]$ thread -n 5
"Reference Handler" Id=2 cpuUsage=0.0% deltaTime=0ms time=0ms WAITING on java.lang.ref.Reference$Lock@7e15a0e0
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.Reference$Lock@7e15a0e0
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)


"Finalizer" Id=3 cpuUsage=0.0% deltaTime=0ms time=31ms WAITING on java.lang.ref.ReferenceQueue$Lock@1b520acc
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.ReferenceQueue$Lock@1b520acc
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)


"Signal Dispatcher" Id=4 cpuUsage=0.0% deltaTime=0ms time=0ms RUNNABLE


"Attach Listener" Id=5 cpuUsage=0.0% deltaTime=0ms time=31ms RUNNABLE


"RMI TCP Accept-26648" Id=21 cpuUsage=0.0% deltaTime=0ms time=0ms RUNNABLE (in native)
    at java.net.DualStackPlainSocketImpl.accept0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketAccept(DualStackPlainSocketImpl.java:131)
    at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:199)
    at java.net.ServerSocket.implAccept(ServerSocket.java:545)
    at java.net.ServerSocket.accept(ServerSocket.java:513)
    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:405)
    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:377)
    at java.lang.Thread.run(Thread.java:748)
    
# 查看指定线程id线程堆栈
[arthas@10580]$ thread 2
"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@7e15a0e0
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.Reference$Lock@7e15a0e0
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)