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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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<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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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-thread"><code class="docutils literal notranslate"><span class="pre">thread</span></code>在线教程</a></p>
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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使用率统计的采样间隔，单位为毫秒，默认值为200</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">显示所有匹配的线程</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="cpu">
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<h2>cpu使用率是如何统计出来的？<a class="headerlink" href="#cpu" title="永久链接至标题">¶</a></h2>
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<p>这里的cpu使用率与linux 命令<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> 的线程<code class="docutils literal notranslate"><span class="pre">%CPU</span></code>类似，一段采样间隔时间内，当前JVM里各个线程的增量cpu时间与采样间隔时间的比例。</p>
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<div class="section" id="id2">
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<h3>工作原理说明：<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h3>
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<ul class="simple">
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<li><p>首先第一次采样，获取所有线程的CPU时间(调用的是<code class="docutils literal notranslate"><span class="pre">java.lang.management.ThreadMXBean#getThreadCpuTime()</span></code>及<code class="docutils literal notranslate"><span class="pre">sun.management.HotspotThreadMBean.getInternalThreadCpuTimes()</span></code>接口)</p></li>
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<li><p>然后睡眠等待一个间隔时间（默认为200ms，可以通过<code class="docutils literal notranslate"><span class="pre">-i</span></code>指定间隔时间）</p></li>
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<li><p>再次第二次采样，获取所有线程的CPU时间，对比两次采样数据，计算出每个线程的增量CPU时间</p></li>
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<li><p>线程CPU使用率 = 线程增量CPU时间 / 采样间隔时间 * 100%</p></li>
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</ul>
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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>另外一种查看Java进程的线程cpu使用率方法：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>
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<div class="section" id="id3">
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<h2>使用参考<a class="headerlink" href="#id3" 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>
|
|
|
<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread -n 3
|
|
|
"C1 CompilerThread0" [Internal] cpuUsage=1.63% deltaTime=3ms time=1170ms
|
|
|
|
|
|
"arthas-command-execute" Id=23 cpuUsage=0.11% deltaTime=0ms time=401ms RUNNABLE
|
|
|
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)
|
|
|
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.base@11.0.7/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
|
|
|
at java.base@11.0.7/java.util.concurrent.FutureTask.run(FutureTask.java:264)
|
|
|
at java.base@11.0.7/java.util.concurrent.ScheduledThreadPoolExecutor$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$Worker.run(ThreadPoolExecutor.java:628)
|
|
|
at java.base@11.0.7/java.lang.Thread.run(Thread.java:834)
|
|
|
|
|
|
"VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=0ms time=584ms</pre></div>
|
|
|
</div>
|
|
|
<ul class="simple">
|
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|
<li><p>没有线程ID，包含<code class="docutils literal notranslate"><span class="pre">[Internal]</span></code>表示为JVM内部线程，参考<a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a>命令的介绍。</p></li>
|
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<li><p><code class="docutils literal notranslate"><span class="pre">cpuUsage</span></code>为采样间隔时间内线程的CPU使用率，与<a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a>命令的数据一致。</p></li>
|
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|
<li><p><code class="docutils literal notranslate"><span class="pre">deltaTime</span></code>为采样间隔时间内线程的增量CPU时间，小于1ms时被取整显示为0ms。</p></li>
|
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<li><p><code class="docutils literal notranslate"><span class="pre">time</span></code> 线程运行总CPU时间。</p></li>
|
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</ul>
|
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|
<p>注意：线程栈为第二采样结束时获取，不能表明采样间隔时间内该线程都是在处理相同的任务。建议间隔时间不要太长，可能间隔时间越大越不准确。
|
|
|
可以根据具体情况尝试指定不同的间隔时间，观察输出结果。</p>
|
|
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</div>
|
|
|
<div class="section" id="id4">
|
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<h3>当没有参数时，显示第一页线程的信息<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
|
|
|
<p>默认按照CPU增量时间降序排列，只显示第一页数据。</p>
|
|
|
<div class="highlight-shell notranslate"><div class="highlight hljs"><pre class="shell">$ thread
|
|
|
Threads Total: 33, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 4, TERMINATED: 0, Internal threads: 17
|
|
|
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPT DAEMON
|
|
|
-1 C2 CompilerThread0 - -1 - 5.06 0.010 0:0.973 false true
|
|
|
-1 C1 CompilerThread0 - -1 - 0.95 0.001 0:0.603 false true
|
|
|
23 arthas-command-execute system 5 RUNNABLE 0.17 0.000 0:0.226 false true
|
|
|
-1 VM Periodic Task Thread - -1 - 0.05 0.000 0:0.094 false true
|
|
|
-1 Sweeper thread - -1 - 0.04 0.000 0:0.011 false true
|
|
|
-1 G1 Young RemSet Sampling - -1 - 0.02 0.000 0:0.025 false true
|
|
|
12 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.022 false true
|
|
|
11 Common-Cleaner InnocuousThrea 8 TIMED_WAI 0.0 0.000 0:0.000 false true
|
|
|
3 Finalizer system 8 WAITING 0.0 0.000 0:0.000 false true
|
|
|
2 Reference Handler system 10 RUNNABLE 0.0 0.000 0:0.000 false true
|
|
|
4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.000 false true
|
|
|
15 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.029 false true
|
|
|
22 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.196 false true
|
|
|
24 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.038 false true
|
|
|
16 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true
|
|
|
17 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true</pre></div>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="thread-all">
|
|
|
<h3>thread –all, 显示所有匹配的线程<a class="headerlink" href="#thread-all" title="永久链接至标题">¶</a></h3>
|
|
|
<p>显示所有匹配线程信息，有时需要获取全部JVM的线程数据进行分析。</p>
|
|
|
</div>
|
|
|
<div class="section" id="thread-id">
|
|
|
<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>
|
|
|
<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">
|
|
|
<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>
|
|
|
<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>
|
|
|
<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>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>
|
|
|
<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> : 统计最近1000ms内的线程CPU时间。</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> : 列出1000ms内最忙的3个线程栈</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">
|
|
|
<h3>thread –state ，查看指定状态的线程<a class="headerlink" href="#thread-state" title="永久链接至标题">¶</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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