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${revision}
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<div class="section" id="thread">
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<h1>thread<a class="headerlink" href="#thread" title="Permalink to this headline">¶</a></h1>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-thread"><code class="docutils literal notranslate"><span class="pre">thread</span></code> online tutorial</a></p>
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<blockquote>
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<div><p>Check the basic info and stack trace of the target thread.</p>
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</div></blockquote>
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<div class="section" id="parameters">
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<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</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">Name</th>
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<th align="left">Specification</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">thread id in JVM</td>
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</tr>
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<tr>
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<td align="right"><code>[n:]</code></td>
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<td align="left">the top n busiest threads with stack traces printed</td>
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</tr>
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<tr>
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<td align="right"><code>[b]</code></td>
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<td align="left">locate the thread blocking the others</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">specify the interval to collect data to compute CPU ratios (ms)</td>
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</tr>
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<tr>
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<td align="right">[--all]</td>
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<td align="left">Show all matching threads</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="how-the-cpu-ratios-are-calculated">
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<h2>How the CPU ratios are calculated?<a class="headerlink" href="#how-the-cpu-ratios-are-calculated" title="Permalink to this headline">¶</a></h2>
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<p>The cpu ratios here is similar to the thread <code class="docutils literal notranslate"><span class="pre">%CPU</span></code> of the linux command <code class="docutils literal notranslate"><span class="pre">top</span> <span class="pre">-H</span> <span class="pre">-p</span> <span class="pre"><pid></span></code>. During a sampling interval,
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the ratio of the incremental cpu time of each thread in the current JVM to the sampling interval time.</p>
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<blockquote>
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<div><p>Working principle description:</p>
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</div></blockquote>
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<ul class="simple">
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<li><p>Do the first sampling, get the CPU time of all threads ( by calling <code class="docutils literal notranslate"><span class="pre">java.lang.management.ThreadMXBean#getThreadCpuTime()</span></code> and
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<code class="docutils literal notranslate"><span class="pre">sun.management.HotspotThreadMBean.getInternalThreadCpuTimes()</span></code> )</p></li>
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<li><p>Sleep and wait for an interval (the default is 200ms, the interval can be specified by <code class="docutils literal notranslate"><span class="pre">-i</span></code>)</p></li>
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<li><p>Do the second sampling, get the CPU time of all threads, compare the two sampling data, and calculate the incremental CPU time of each thread</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">Thread</span> <span class="pre">CPU</span> <span class="pre">usage</span> <span class="pre">ratio</span></code> = <code class="docutils literal notranslate"><span class="pre">Thread</span> <span class="pre">increment</span> <span class="pre">CPU</span> <span class="pre">time</span></code> / <code class="docutils literal notranslate"><span class="pre">Sampling</span> <span class="pre">interval</span> <span class="pre">time</span></code> * 100%</p></li>
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</ul>
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<blockquote>
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<div><p>Note: this operation consumes CPU time too (<code class="docutils literal notranslate"><span class="pre">getThreadCpuTime</span></code> is time-consuming), therefore it is possible to observe Arthas’s thread appears in the list. To avoid this, try to increase sample interval, for example: 5000 ms.<br/></p>
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</div></blockquote>
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<blockquote>
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<div><p>Another way to view the thread cpu usage of the Java process, <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> can come to help.</p>
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</div></blockquote>
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</div>
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<div class="section" id="usage">
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<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<div class="section" id="list-the-top-n-busiest-threads-with-detailed-stack-trace">
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<h3>List the top n busiest threads with detailed stack trace<a class="headerlink" href="#list-the-top-n-busiest-threads-with-detailed-stack-trace" title="Permalink to this headline">¶</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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"C1 CompilerThread0" [Internal] cpuUsage=1.63% deltaTime=3ms time=1170ms
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"arthas-command-execute" Id=23 cpuUsage=0.11% deltaTime=0ms time=401ms RUNNABLE
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at java.management@11.0.7/sun.management.ThreadImpl.dumpThreads0(Native Method)
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at java.management@11.0.7/sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:466)
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at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:199)
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at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:122)
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at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
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at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
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at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
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at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
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at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385)
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at java.base@11.0.7/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
|
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at java.base@11.0.7/java.util.concurrent.FutureTask.run(FutureTask.java:264)
|
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|
at java.base@11.0.7/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
|
|
|
at java.base@11.0.7/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
|
|
|
at java.base@11.0.7/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
|
|
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at java.base@11.0.7/java.lang.Thread.run(Thread.java:834)
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"VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=0ms time=584ms</pre></div>
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</div>
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|
<ul class="simple">
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|
<li><p>Without thread ID, including <code class="docutils literal notranslate"><span class="pre">[Internal]</span></code> means JVM internal thread, refer to the introduction of <a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a> command.</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">cpuUsage</span></code> is the CPU usage of the thread during the sampling interval, consistent with the data of the <a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a> command.</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">deltaTime</span></code> is the incremental CPU time of the thread during the sampling interval. If it is less than 1ms, it will be rounded and displayed as 0ms.</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">time</span></code> The total CPU time of thread.</p></li>
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</ul>
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<p><strong>Note:</strong> The thread stack is acquired at the end of the second sampling, which does not indicate that the thread is
|
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processing the same task during the sampling interval. It is recommended that the interval time should not be too long.
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The larger the interval time, the more inaccurate.</p>
|
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<p>You can try to specify different intervals according to the specific situation and observe the output results.</p>
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</div>
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<div class="section" id="list-first-page-threads-info-when-no-options-provided">
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<h3>List first page threads’ info when no options provided<a class="headerlink" href="#list-first-page-threads-info-when-no-options-provided" title="Permalink to this headline">¶</a></h3>
|
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<p>By default, they are arranged in descending order of CPU increment time, and only the first page of data is displayed.</p>
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<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread
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Threads Total: 33, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 4, TERMINATED: 0, Internal threads: 17
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ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPT DAEMON
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-1 C2 CompilerThread0 - -1 - 5.06 0.010 0:0.973 false true
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-1 C1 CompilerThread0 - -1 - 0.95 0.001 0:0.603 false true
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23 arthas-command-execute system 5 RUNNABLE 0.17 0.000 0:0.226 false true
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-1 VM Periodic Task Thread - -1 - 0.05 0.000 0:0.094 false true
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-1 Sweeper thread - -1 - 0.04 0.000 0:0.011 false true
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-1 G1 Young RemSet Sampling - -1 - 0.02 0.000 0:0.025 false true
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12 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.022 false true
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11 Common-Cleaner InnocuousThrea 8 TIMED_WAI 0.0 0.000 0:0.000 false true
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3 Finalizer system 8 WAITING 0.0 0.000 0:0.000 false true
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2 Reference Handler system 10 RUNNABLE 0.0 0.000 0:0.000 false true
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4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.000 false true
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15 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.029 false true
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22 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.196 false true
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24 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.038 false true
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16 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true
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|
17 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true</pre></div>
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</div>
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|
</div>
|
|
|
<div class="section" id="thread-all-show-all-matching-threads">
|
|
|
<h3>thread –all, show all matching threads<a class="headerlink" href="#thread-all-show-all-matching-threads" title="Permalink to this headline">¶</a></h3>
|
|
|
<p>Display all matching threads. Sometimes it is necessary to obtain all the thread data of the JVM for analysis.</p>
|
|
|
</div>
|
|
|
<div class="section" id="thread-id-show-the-running-stack-for-the-target-thread">
|
|
|
<h3>thread id, show the running stack for the target thread<a class="headerlink" href="#thread-id-show-the-running-stack-for-the-target-thread" title="Permalink to this headline">¶</a></h3>
|
|
|
<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ 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)</pre></div>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="thread-b-locate-the-thread-bocking-the-others">
|
|
|
<h3>thread -b, locate the thread bocking the others<a class="headerlink" href="#thread-b-locate-the-thread-bocking-the-others" title="Permalink to this headline">¶</a></h3>
|
|
|
<p>In some occasions, we experience the whole application is stuck because there’s one particular thread hold one lock that other threads are relying on. To diagnose such an issue, Arthas provides <code class="docutils literal notranslate"><span class="pre">thread</span> <span class="pre">-b</span></code> to find the problematic thread in one single command.</p>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ thread -b
|
|
|
"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)
|
|
|
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>Note: By now Arthas only supports to locate the thread blocked by <code class="docutils literal notranslate"><span class="pre">synchronzied</span></code>, while <code class="docutils literal notranslate"><span class="pre">java.util.concurrent.Lock</span></code> is not supported yet.</p>
|
|
|
</div></blockquote>
|
|
|
</div>
|
|
|
<div class="section" id="thread-i-specify-the-sampling-interval">
|
|
|
<h3>thread -i, specify the sampling interval<a class="headerlink" href="#thread-i-specify-the-sampling-interval" title="Permalink to this headline">¶</a></h3>
|
|
|
<ul class="simple">
|
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">thread</span> <span class="pre">-i</span> <span class="pre">1000</span></code>: Count the thread cpu time of the last 1000ms.</p></li>
|
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">thread</span> <span class="pre">-n</span> <span class="pre">3</span> <span class="pre">-i</span> <span class="pre">1000</span></code>: List the 3 busiest thread stacks in 1000ms</p></li>
|
|
|
</ul>
|
|
|
<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>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="thread-state-view-the-special-state-theads">
|
|
|
<h3>thread –state , view the special state theads<a class="headerlink" href="#thread-state-view-the-special-state-theads" title="Permalink to this headline">¶</a></h3>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">[arthas@28114]$ thread --state WAITING
|
|
|
Threads Total: 16, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 4, TERMINATED: 0
|
|
|
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
|
|
|
3 Finalizer system 8 WAITING 0.0 0.000 0:0.000 false true
|
|
|
20 arthas-UserStat system 9 WAITING 0.0 0.000 0:0.001 false true
|
|
|
14 arthas-timer system 9 WAITING 0.0 0.000 0:0.000 false true</pre></div>
|
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</div>
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