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3.1.2
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<li class="toctree-l3"><a class="reference internal" href="#id2">使用参考</a><ul>
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<li class="toctree-l4"><a class="reference internal" href="#n">支持一键展示当前最忙的前N个线程并打印堆栈：</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#id3">当没有参数时，显示所有线程的信息。</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#thread-id">thread id， 显示指定线程的运行堆栈</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#thread-b">thread -b, 找出当前阻塞其他线程的线程</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#thread-i">thread -i, 指定采样时间间隔</a></li>
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<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/thread.md" class="fa fa-github"> Edit on GitHub</a>
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<div class="section" id="thread">
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<h1>thread<a class="headerlink" href="#thread" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>查看当前线程信息，查看线程的堆栈</p>
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</div></blockquote>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>id</em></td>
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<td align="left">线程id</td>
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</tr>
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<tr>
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<td align="right">[n:]</td>
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<td align="left">指定最忙的前N个线程并打印堆栈</td>
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</tr>
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<tr>
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<td align="right">[b]</td>
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<td align="left">找出当前阻塞其他线程的线程</td>
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</tr>
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<tr>
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<td align="right">[i <code><value></code>]</td>
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<td align="left">指定cpu占比统计的采样间隔，单位为毫秒</td>
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</tr>
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</tbody>
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</table><blockquote>
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<div><p>cpu占比是如何统计出来的？</p>
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</div></blockquote>
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<blockquote>
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<div><p>这里的cpu统计的是，一段采样间隔内，当前JVM里各个线程所占用的cpu时间占总cpu时间的百分比。其计算方法为：
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首先进行一次采样，获得所有线程的cpu的使用时间(调用的是<code class="docutils literal notranslate"><span class="pre">java.lang.management.ThreadMXBean#getThreadCpuTime</span></code>这个接口)，然后睡眠一段时间，默认100ms，可以通过<code class="docutils literal notranslate"><span class="pre">-i</span></code>参数指定，然后再采样一次，最后得出这段时间内各个线程消耗的cpu时间情况，最后算出百分比。</p>
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</div></blockquote>
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<blockquote>
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<div><p>注意： 这个统计也会产生一定的开销（JDK这个接口本身开销比较大），因此会看到as的线程占用一定的百分比，为了降低统计自身的开销带来的影响，可以把采样间隔拉长一些，比如5000毫秒。</p>
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</div></blockquote>
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<blockquote>
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<div><p>如果想看从Java进程启动开始到现在的cpu占比情况：可以使用<a class="reference external" href="https://github.com/oldratlee/useful-scripts/blob/master/docs/java.md#-show-busy-java-threads">show-busy-java-threads</a>这个脚本</p>
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</div></blockquote>
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</div>
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<div class="section" id="id2">
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<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<div class="section" id="n">
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<h3>支持一键展示当前最忙的前N个线程并打印堆栈：<a class="headerlink" href="#n" title="永久链接至标题">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread -n 3
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"as-command-execute-daemon" Id=29 cpuUsage=75% RUNNABLE
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at sun.management.ThreadImpl.dumpThreads0(Native Method)
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at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
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at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)
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at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)
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at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)
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at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)
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at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
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at java.lang.Thread.run(Thread.java:745)
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Number of locked synchronizers = 1
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- java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8
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"as-session-expire-daemon" Id=25 cpuUsage=24% TIMED_WAITING
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at java.lang.Thread.sleep(Native Method)
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at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)
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"Reference Handler" Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@69ba0f27
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at java.lang.Object.wait(Native Method)
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- waiting on java.lang.ref.Reference$Lock@69ba0f27
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at java.lang.Object.wait(Object.java:503)
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at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)</pre></div>
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</div>
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</div>
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<div class="section" id="id3">
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<h3>当没有参数时，显示所有线程的信息。<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread
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Threads Total: 16, NEW: 0, RUNNABLE: 7, BLOCKED: 0, WAITING: 5, TIMED_WAITING: 4, TERMINATED: 0
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ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTE DAEMON
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30 as-command-execute-daemon system 9 RUNNABLE 72 0:0 false true
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23 as-session-expire-daemon system 9 TIMED_WAIT 27 0:0 false true
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22 Attach Listener system 9 RUNNABLE 0 0:0 false true
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11 pool-2-thread-1 main 5 TIMED_WAIT 0 0:0 false false
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12 Thread-2 main 5 RUNNABLE 0 0:0 false true
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13 pool-3-thread-1 main 5 TIMED_WAIT 0 0:0 false false
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25 as-selector-daemon system 9 RUNNABLE 0 0:0 false true
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14 Thread-3 main 5 TIMED_WAIT 0 0:0 false false
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26 pool-5-thread-1 system 5 WAITING 0 0:0 false false
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15 Thread-4 main 5 RUNNABLE 0 0:0 false false
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1 main main 5 WAITING 0 0:2 false false
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2 Reference Handler system 10 WAITING 0 0:0 false true
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3 Finalizer system 8 WAITING 0 0:0 false true
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4 Signal Dispatcher system 9 RUNNABLE 0 0:0 false true
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20 NonBlockingInputStreamThread main 5 WAITING 0 0:0 false true
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21 Thread-8 main 5 RUNNABLE 0 0:0 false true</pre></div>
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</div>
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</div>
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<div class="section" id="thread-id">
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<h3>thread id， 显示指定线程的运行堆栈<a class="headerlink" href="#thread-id" title="永久链接至标题">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread 1
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"main" Id=1 WAITING on java.util.concurrent.CountDownLatch$Sync@29fafb28
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at sun.misc.Unsafe.park(Native Method)
|
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- waiting on java.util.concurrent.CountDownLatch$Sync@29fafb28
|
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at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
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at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
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at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
|
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|
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
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at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)</pre></div>
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</div>
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</div>
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<div class="section" id="thread-b">
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<h3>thread -b, 找出当前阻塞其他线程的线程<a class="headerlink" href="#thread-b" title="永久链接至标题">¶</a></h3>
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<p>有时候我们发现应用卡住了， 通常是由于某个线程拿住了某个锁， 并且其他线程都在等待这把锁造成的。 为了排查这类问题， arthas提供了<code class="docutils literal notranslate"><span class="pre">thread</span> <span class="pre">-b</span></code>， 一键找出那个罪魁祸首。</p>
|
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ thread -b
|
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"http-bio-8080-exec-4" Id=27 TIMED_WAITING
|
|
|
at java.lang.Thread.sleep(Native Method)
|
|
|
at test.arthas.TestThreadBlocking.doGet(TestThreadBlocking.java:22)
|
|
|
- locked java.lang.Object@725be470 <---- but blocks 4 other threads!
|
|
|
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
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|
|
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
|
|
|
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
|
|
|
at test.filter.TestDurexFilter.doFilter(TestDurexFilter.java:46)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
|
|
|
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
|
|
|
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
|
|
|
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
|
|
|
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
|
|
|
at com.taobao.tomcat.valves.ContextLoadFilterValve$FilterChainAdapter.doFilter(ContextLoadFilterValve.java:191)
|
|
|
at com.taobao.eagleeye.EagleEyeFilter.doFilter(EagleEyeFilter.java:81)
|
|
|
at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke(ContextLoadFilterValve.java:150)
|
|
|
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
|
|
|
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
|
|
|
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
|
|
|
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:429)
|
|
|
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
|
|
|
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
|
|
|
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
|
|
|
- locked org.apache.tomcat.util.net.SocketWrapper@7127ee12
|
|
|
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
|
|
|
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
|
|
|
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
|
|
|
at java.lang.Thread.run(Thread.java:745)
|
|
|
|
|
|
Number of locked synchronizers = 1
|
|
|
- java.util.concurrent.ThreadPoolExecutor$Worker@31a6493e</pre></div>
|
|
|
</div>
|
|
|
<blockquote>
|
|
|
<div><p>注意， 目前只支持找出synchronized关键字阻塞住的线程， 如果是<code class="docutils literal notranslate"><span class="pre">java.util.concurrent.Lock</span></code>， 目前还不支持。</p>
|
|
|
</div></blockquote>
|
|
|
</div>
|
|
|
<div class="section" id="thread-i">
|
|
|
<h3>thread -i, 指定采样时间间隔<a class="headerlink" href="#thread-i" title="永久链接至标题">¶</a></h3>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ thread -n 3 -i 1000
|
|
|
"as-command-execute-daemon" Id=4759 cpuUsage=23% RUNNABLE
|
|
|
at sun.management.ThreadImpl.dumpThreads0(Native Method)
|
|
|
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
|
|
|
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:133)
|
|
|
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:79)
|
|
|
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:96)
|
|
|
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:27)
|
|
|
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:125)
|
|
|
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:122)
|
|
|
at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:332)
|
|
|
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
|
|
|
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
|
|
|
at java.lang.Thread.run(Thread.java:756)
|
|
|
|
|
|
Number of locked synchronizers = 1
|
|
|
- java.util.concurrent.ThreadPoolExecutor$Worker@546aeec1
|
|
|
...</pre></div>
|
|
|
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