arthas-常用命令

2021-06-13 22:33:56 阅读：404 来源： 互联网

标签：false 0.0 常用命令 arthas java true 0.000

安装

安装很容易 , arthas是以 jar 包的形式运行的

wget https://arthas.aliyun.com/arthas-boot.jar

java -jar arthas-boot.jar

模拟

我们以官方提供的例子为例

wget https://arthas.aliyun.com/math-game.jar
java -jar math-game.jar

然后再另外的窗口运行 arthas , 下面使用 monitor 命令, 该命令可以监控方法调用的情况包括 :

例如我们可以知道知道每5秒, run方法的调用情况.

[arthas@38487]$ monitor demo.run -c 5
The argument 'method-pattern' is required, description: Method of Pattern Matching
[arthas@38487]$ monitor demo.MathGame run -c 5 
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 20 ms, listenerId: 2
 timestamp              class                              method                            total       success    fail        avg-rt(ms  fail-rate  
                                                                                                                                )                     
------------------------------------------------------------------------------------------------------------------------------------------------------
 2021-06-13 21:58:31    demo.MathGame                      run                               4           4          0           0.15       0.00%      

 timestamp              class                              method                            total       success    fail        avg-rt(ms  fail-rate  
                                                                                                                                )                     
------------------------------------------------------------------------------------------------------------------------------------------------------
 2021-06-13 21:58:36    demo.MathGame                      run                               5           5          0           0.13       0.00%      

 timestamp              class                              method                            total       success    fail        avg-rt(ms  fail-rate  
                                                                                                                                )

可以看到 avg-rt(平均响应) 我们可以找到最耗时的方法 , 然后进行定位问题 , 这里我们以下面这篇文章为例子 , 定位 druid 的一个问题 ,

可以看到作者找到了比较耗时的方法调用, 于是作者使用了 trace 命令进行查看,而该方法是调用了 java本身库内的方法为了定位问题, 作者 monitor 了 ReentrantLock这个方法

最终定位到了问题 , 而为了查看某个线程阻塞的原因, 我们对线程进行了查看, 找到某些阻塞的线程

thread  --state  BLOCKING

最后看到

java.util.concurrent.locks.ReentrantLock$FairSync@60190bc0  
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.ReentrantLock$FairSync@60190bc0
    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.acquireQueued(AbstractQueuedSynchronizer.java:870)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
    at java.util.concurrent.locks.ReentrantLock$FairSync.lock(ReentrantLock.java:224)
    at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
    at com.alibaba.druid.pool.DruidDataSource.recycle(DruidDataSource.java:1913)
    at com.alibaba.druid.pool.DruidPooledConnection.recycle(DruidPooledConnection.java:324)
    at com.alibaba.druid.pool.DruidPooledConnection.syncClose(DruidPooledConnection.java:300)
    at com.alibaba.druid.pool.DruidPooledConnection.close(DruidPooledConnection.java:255)
    at org.springframework.jdbc.datasource.DataSourceUtils.doCloseConnection(DataSourceUtils.java:341)

原来是使用了公平锁导致的,找到了问题就可以进行优化了.

trace 命令

trace命令是为了方法内部调用路径，并输出方法路径上的每个节点上耗时 , 上面的例子有一个就是调用了 trace 的效果

tread 命令

这个命令就比较常用点,用户查找阻塞的线程等等

例如可以这样使用


[arthas@38487]$ thread -n 5
"C2 CompilerThread2" [Internal] cpuUsage=2.84% deltaTime=5ms time=549ms


"C1 CompilerThread3" [Internal] cpuUsage=0.26% deltaTime=0ms time=772ms


"arthas-command-execute" Id=23 cpuUsage=0.12% deltaTime=0ms time=316ms RUNNABLE
    at sun.management.ThreadImpl.dumpThreads0(Native Method)
    at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:448)
    at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:206)
    at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:122)
    at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
    at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
    at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
    at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
    at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)


"C2 CompilerThread0" [Internal] cpuUsage=0.06% deltaTime=0ms time=518ms


"VM Periodic Task Thread" [Internal] cpuUsage=0.03% deltaTime=0ms time=1348ms


[arthas@38487]$ thread --all 
Threads Total: 30, NEW: 0, RUNNABLE: 8, BLOCKED: 0, WAITING: 4, TIMED_WAITING: 3, TERMINATED: 0, Internal threads: 15                                 
ID    NAME                                  GROUP              PRIORITY    STATE        %CPU        DELTA_TIME   TIME        INTERRUPTED  DAEMON      
-1    C1 CompilerThread3                    -                  -1          -            0.32        0.000        0:0.781     false        true        
23    arthas-command-execute                system             5           RUNNABLE     0.09        0.000        0:0.318     false        true        
-1    VM Periodic Task Thread               -                  -1          -            0.05        0.000        0:1.355     false        true        
-1    VM Thread                             -                  -1          -            0.04        0.000        0:0.168     false        true        
2     Reference Handler                     system             10          WAITING      0.0         0.000        0:0.003     false        true        
3     Finalizer                             system             8           WAITING      0.0         0.000        0:0.005     false        true        
4     Signal Dispatcher                     system             9           RUNNABLE     0.0         0.000        0:0.000     false        true        
10    Attach Listener                       system             9           RUNNABLE     0.0         0.000        0:0.012     false        true        
12    arthas-timer                          system             9           WAITING      0.0         0.000        0:0.000     false        true        
15    arthas-NettyHttpTelnetBootstrap-3-1   system             5           RUNNABLE     0.0         0.000        0:0.017     false        true        
16    arthas-NettyWebsocketTtyBootstrap-4-1 system             5           RUNNABLE     0.0         0.000        0:0.002     false        true        
17    arthas-NettyWebsocketTtyBootstrap-4-2 system             5           RUNNABLE     0.0         0.000        0:0.001     false        true        
18    arthas-shell-server                   system             9           TIMED_WAITIN 0.0         0.000        0:0.007     false        true        
19    arthas-session-manager                system             9           TIMED_WAITIN 0.0         0.000        0:0.002     false        true        
20    arthas-UserStat                       system             9           WAITING      0.0         0.000        0:0.000     false        true        
22    arthas-NettyHttpTelnetBootstrap-3-2   system             5           RUNNABLE     0.0         0.000        0:0.243     false        true        
25    arthas-NettyHttpTelnetBootstrap-3-3   system             5           RUNNABLE     0.0         0.000        0:0.101     false        true        
1     main                                  main               5           TIMED_WAITIN 0.0         0.000        0:0.543     false        false       
-1    C2 CompilerThread2                    -                  -1          -            0.0         0.000        0:0.549     false        true        
-1    GC task thread#7 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.042     false        true        
-1    GC task thread#6 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.046     false        true        
-1    GC task thread#0 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.045     false        true        
-1    C2 CompilerThread0                    -                  -1          -            0.0         0.000        0:0.518     false        true        
-1    Service Thread                        -                  -1          -            0.0         0.000        0:0.000     false        true        
-1    C2 CompilerThread1                    -                  -1          -            0.0         0.000        0:0.526     false        true        
-1    GC task thread#1 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.038     false        true        
-1    GC task thread#2 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.046     false        true        
-1    GC task thread#3 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.033     false        true        
-1    GC task thread#5 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.044     false        true        
-1    GC task thread#4 (ParallelGC)         -                  -1          -            0.0         0.000        0:0.051     false        true        
[arthas@38487]$ thread 1
"main" Id=1 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at java.lang.Thread.sleep(Thread.java:340)
    at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:386)
    at demo.MathGame.main(MathGame.java:17)

[arthas@38487]$ thread --state RUNNABLE
Threads Total: 15, NEW: 0, RUNNABLE: 8, BLOCKED: 0, WAITING: 4, TIMED_WAITING: 3, TERMINATED: 0                                                       
ID    NAME                                  GROUP              PRIORITY    STATE        %CPU        DELTA_TIME   TIME        INTERRUPTED  DAEMON      
23    arthas-command-execute                system             5           RUNNABLE     0.05        0.000        0:0.324     false        true        
4     Signal Dispatcher                     system             9           RUNNABLE     0.0         0.000        0:0.000     false        true        
10    Attach Listener                       system             9           RUNNABLE     0.0         0.000        0:0.012     false        true        
15    arthas-NettyHttpTelnetBootstrap-3-1   system             5           RUNNABLE     0.0         0.000        0:0.017     false        true        
16    arthas-NettyWebsocketTtyBootstrap-4-1 system             5           RUNNABLE     0.0         0.000        0:0.002     false        true        
17    arthas-NettyWebsocketTtyBootstrap-4-2 system             5           RUNNABLE     0.0         0.000        0:0.001     false        true        
22    arthas-NettyHttpTelnetBootstrap-3-2   system             5           RUNNABLE     0.0         0.000        0:0.243     false        true        
25    arthas-NettyHttpTelnetBootstrap-3-3   system             5           RUNNABLE     0.0         0.000        0:0.117     false        true        
                                                                                                                                                      
[arthas@38487]$

参考资料

https://arthas.aliyun.com/doc/index.html (重要,文档,推荐一看)

标签：false,0.0,常用命令,arthas,java,true,0.000
来源： https://www.cnblogs.com/Benjious/p/14881395.html

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ICode9

arthas-常用命令

安装

模拟

trace 命令

tread 命令

参考资料