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<li class="toctree-l3"><a class="reference internal" href="#">使用参考</a><ul>
<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>
<li class="toctree-l4"><a class="reference internal" href="#">当没有参数时，显示所有线程的信息。</a></li>
<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>
<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>
<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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<div class="section" id="thread">
<span id="thread"></span><h1>thread<a class="headerlink" href="#thread" title="永久链接至标题">¶</a></h1>
<blockquote>
<div>查看当前线程信息，查看线程的堆栈</div></blockquote>
<div class="section" id="">
<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">参数名称</th>
<th align="left">参数说明</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>id</em></td>
<td align="left">线程id</td>
</tr>
<tr>
<td align="right">[n:]</td>
<td align="left">指定最忙的前N个线程并打印堆栈</td>
</tr>
<tr>
<td align="right">[b]</td>
<td align="left">找出当前阻塞其他线程的线程</td>
</tr>
<tr>
<td align="right">[i <code><value></code>]</td>
<td align="left">指定cpu占比统计的采样间隔，单位为毫秒</td>
</tr>
</tbody>
</table><blockquote>
<div>cpu占比是如何统计出来的？</div></blockquote>
<blockquote>
<div>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：
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。</div></blockquote>
<blockquote>
<div>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。</div></blockquote>
<blockquote>
<div>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</div></blockquote>
</div>
<div class="section" id="">
<span id="id2"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<div class="section" id="n">
<span id="n"></span><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"><pre><span></span>$ thread -n <span class="m">3</span>
<span class="s2">"as-command-execute-daemon"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">29</span> <span class="nv">cpuUsage</span><span class="o">=</span><span class="m">75</span>% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0<span class="o">(</span>Native Method<span class="o">)</span>
at sun.management.ThreadImpl.getThreadInfo<span class="o">(</span>ThreadImpl.java:440<span class="o">)</span>
at com.taobao.arthas.core.command.monitor200.ThreadCommand<span class="nv">$1</span>.action<span class="o">(</span>ThreadCommand.java:58<span class="o">)</span>
at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute<span class="o">(</span>AbstractCommandHandler.java:238<span class="o">)</span>
at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand<span class="o">(</span>DefaultCommandHandler.java:67<span class="o">)</span>
at com.taobao.arthas.core.server.ArthasServer<span class="nv">$4</span>.run<span class="o">(</span>ArthasServer.java:276<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor.runWorker<span class="o">(</span>ThreadPoolExecutor.java:1145<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>.run<span class="o">(</span>ThreadPoolExecutor.java:615<span class="o">)</span>
at java.lang.Thread.run<span class="o">(</span>Thread.java:745<span class="o">)</span>
Number of locked <span class="nv">synchronizers</span> <span class="o">=</span> <span class="m">1</span>
- java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>@6cd0b6f8
<span class="s2">"as-session-expire-daemon"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">25</span> <span class="nv">cpuUsage</span><span class="o">=</span><span class="m">24</span>% TIMED_WAITING
at java.lang.Thread.sleep<span class="o">(</span>Native Method<span class="o">)</span>
at com.taobao.arthas.core.server.DefaultSessionManager<span class="nv">$2</span>.run<span class="o">(</span>DefaultSessionManager.java:85<span class="o">)</span>
<span class="s2">"Reference Handler"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">2</span> <span class="nv">cpuUsage</span><span class="o">=</span><span class="m">0</span>% WAITING on java.lang.ref.Reference<span class="nv">$Lock</span>@69ba0f27
at java.lang.Object.wait<span class="o">(</span>Native Method<span class="o">)</span>
- waiting on java.lang.ref.Reference<span class="nv">$Lock</span>@69ba0f27
at java.lang.Object.wait<span class="o">(</span>Object.java:503<span class="o">)</span>
at java.lang.ref.Reference<span class="nv">$ReferenceHandler</span>.run<span class="o">(</span>Reference.java:133<span class="o">)</span>
</pre></div>
</div>
</div>
<div class="section" id="">
<span id="id3"></span><h3>当没有参数时，显示所有线程的信息。<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ thread
Threads Total: <span class="m">16</span>, NEW: <span class="m">0</span>, RUNNABLE: <span class="m">7</span>, BLOCKED: <span class="m">0</span>, WAITING: <span class="m">5</span>, TIMED_WAITING: <span class="m">4</span>, TERMINATED: <span class="m">0</span>
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTE DAEMON
<span class="m">30</span> as-command-execute-daemon system <span class="m">9</span> RUNNABLE <span class="m">72</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">23</span> as-session-expire-daemon system <span class="m">9</span> TIMED_WAIT <span class="m">27</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">22</span> Attach Listener system <span class="m">9</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">11</span> pool-2-thread-1 main <span class="m">5</span> TIMED_WAIT <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">12</span> Thread-2 main <span class="m">5</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">13</span> pool-3-thread-1 main <span class="m">5</span> TIMED_WAIT <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">25</span> as-selector-daemon system <span class="m">9</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">14</span> Thread-3 main <span class="m">5</span> TIMED_WAIT <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">26</span> pool-5-thread-1 system <span class="m">5</span> WAITING <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">15</span> Thread-4 main <span class="m">5</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">1</span> main main <span class="m">5</span> WAITING <span class="m">0</span> <span class="m">0</span>:2 <span class="nb">false</span> <span class="nb">false</span>
<span class="m">2</span> Reference Handler system <span class="m">10</span> WAITING <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">3</span> Finalizer system <span class="m">8</span> WAITING <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">4</span> Signal Dispatcher system <span class="m">9</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">20</span> NonBlockingInputStreamThread main <span class="m">5</span> WAITING <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
<span class="m">21</span> Thread-8 main <span class="m">5</span> RUNNABLE <span class="m">0</span> <span class="m">0</span>:0 <span class="nb">false</span> <span class="nb">true</span>
</pre></div>
</div>
</div>
<div class="section" id="thread-id">
<span id="thread-id"></span><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"><pre><span></span>$ thread <span class="m">1</span>
<span class="s2">"main"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">1</span> WAITING on java.util.concurrent.CountDownLatch<span class="nv">$Sync</span>@29fafb28
at sun.misc.Unsafe.park<span class="o">(</span>Native Method<span class="o">)</span>
- waiting on java.util.concurrent.CountDownLatch<span class="nv">$Sync</span>@29fafb28
at java.util.concurrent.locks.LockSupport.park<span class="o">(</span>LockSupport.java:175<span class="o">)</span>
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt<span class="o">(</span>AbstractQueuedSynchronizer.java:836<span class="o">)</span>
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly<span class="o">(</span>AbstractQueuedSynchronizer.java:997<span class="o">)</span>
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly<span class="o">(</span>AbstractQueuedSynchronizer.java:1304<span class="o">)</span>
at java.util.concurrent.CountDownLatch.await<span class="o">(</span>CountDownLatch.java:231<span class="o">)</span>
</pre></div>
</div>
</div>
<div class="section" id="thread-b">
<span id="thread-b"></span><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-sh notranslate"><div class="highlight"><pre><span></span>$ thread -b
<span class="s2">"http-bio-8080-exec-4"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">27</span> TIMED_WAITING
at java.lang.Thread.sleep<span class="o">(</span>Native Method<span class="o">)</span>
at test.arthas.TestThreadBlocking.doGet<span class="o">(</span>TestThreadBlocking.java:22<span class="o">)</span>
- locked java.lang.Object@725be470 <---- but blocks <span class="m">4</span> other threads!
at javax.servlet.http.HttpServlet.service<span class="o">(</span>HttpServlet.java:624<span class="o">)</span>
at javax.servlet.http.HttpServlet.service<span class="o">(</span>HttpServlet.java:731<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter<span class="o">(</span>ApplicationFilterChain.java:303<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.doFilter<span class="o">(</span>ApplicationFilterChain.java:208<span class="o">)</span>
at org.apache.tomcat.websocket.server.WsFilter.doFilter<span class="o">(</span>WsFilter.java:52<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter<span class="o">(</span>ApplicationFilterChain.java:241<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.doFilter<span class="o">(</span>ApplicationFilterChain.java:208<span class="o">)</span>
at test.filter.TestDurexFilter.doFilter<span class="o">(</span>TestDurexFilter.java:46<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter<span class="o">(</span>ApplicationFilterChain.java:241<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.doFilter<span class="o">(</span>ApplicationFilterChain.java:208<span class="o">)</span>
at org.apache.catalina.core.StandardWrapperValve.invoke<span class="o">(</span>StandardWrapperValve.java:220<span class="o">)</span>
at org.apache.catalina.core.StandardContextValve.invoke<span class="o">(</span>StandardContextValve.java:122<span class="o">)</span>
at org.apache.catalina.authenticator.AuthenticatorBase.invoke<span class="o">(</span>AuthenticatorBase.java:505<span class="o">)</span>
at com.taobao.tomcat.valves.ContextLoadFilterValve<span class="nv">$FilterChainAdapter</span>.doFilter<span class="o">(</span>ContextLoadFilterValve.java:191<span class="o">)</span>
at com.taobao.eagleeye.EagleEyeFilter.doFilter<span class="o">(</span>EagleEyeFilter.java:81<span class="o">)</span>
at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke<span class="o">(</span>ContextLoadFilterValve.java:150<span class="o">)</span>
at org.apache.catalina.core.StandardHostValve.invoke<span class="o">(</span>StandardHostValve.java:170<span class="o">)</span>
at org.apache.catalina.valves.ErrorReportValve.invoke<span class="o">(</span>ErrorReportValve.java:103<span class="o">)</span>
at org.apache.catalina.core.StandardEngineValve.invoke<span class="o">(</span>StandardEngineValve.java:116<span class="o">)</span>
at org.apache.catalina.connector.CoyoteAdapter.service<span class="o">(</span>CoyoteAdapter.java:429<span class="o">)</span>
at org.apache.coyote.http11.AbstractHttp11Processor.process<span class="o">(</span>AbstractHttp11Processor.java:1085<span class="o">)</span>
at org.apache.coyote.AbstractProtocol<span class="nv">$AbstractConnectionHandler</span>.process<span class="o">(</span>AbstractProtocol.java:625<span class="o">)</span>
at org.apache.tomcat.util.net.JIoEndpoint<span class="nv">$SocketProcessor</span>.run<span class="o">(</span>JIoEndpoint.java:318<span class="o">)</span>
- locked org.apache.tomcat.util.net.SocketWrapper@7127ee12
at java.util.concurrent.ThreadPoolExecutor.runWorker<span class="o">(</span>ThreadPoolExecutor.java:1142<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>.run<span class="o">(</span>ThreadPoolExecutor.java:617<span class="o">)</span>
at org.apache.tomcat.util.threads.TaskThread<span class="nv">$WrappingRunnable</span>.run<span class="o">(</span>TaskThread.java:61<span class="o">)</span>
at java.lang.Thread.run<span class="o">(</span>Thread.java:745<span class="o">)</span>
Number of locked <span class="nv">synchronizers</span> <span class="o">=</span> <span class="m">1</span>
- java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>@31a6493e
</pre></div>
</div>
<blockquote>
<div>注意， 目前只支持找出synchronized关键字阻塞住的线程， 如果是JUL的锁， 目前还不支持。</div></blockquote>
</div>
<div class="section" id="thread-i">
<span id="thread-i"></span><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-sh notranslate"><div class="highlight"><pre><span></span>$ thread -n <span class="m">3</span> -i <span class="m">1000</span>
<span class="s2">"as-command-execute-daemon"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">4759</span> <span class="nv">cpuUsage</span><span class="o">=</span><span class="m">23</span>% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0<span class="o">(</span>Native Method<span class="o">)</span>
at sun.management.ThreadImpl.getThreadInfo<span class="o">(</span>ThreadImpl.java:440<span class="o">)</span>
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads<span class="o">(</span>ThreadCommand.java:133<span class="o">)</span>
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process<span class="o">(</span>ThreadCommand.java:79<span class="o">)</span>
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process<span class="o">(</span>AnnotatedCommandImpl.java:96<span class="o">)</span>
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access<span class="nv">$100</span><span class="o">(</span>AnnotatedCommandImpl.java:27<span class="o">)</span>
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl<span class="nv">$ProcessHandler</span>.handle<span class="o">(</span>AnnotatedCommandImpl.java:125<span class="o">)</span>
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl<span class="nv">$ProcessHandler</span>.handle<span class="o">(</span>AnnotatedCommandImpl.java:122<span class="o">)</span>
at com.taobao.arthas.core.shell.system.impl.ProcessImpl<span class="nv">$CommandProcessTask</span>.run<span class="o">(</span>ProcessImpl.java:332<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor.runWorker<span class="o">(</span>ThreadPoolExecutor.java:1142<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>.run<span class="o">(</span>ThreadPoolExecutor.java:617<span class="o">)</span>
at java.lang.Thread.run<span class="o">(</span>Thread.java:756<span class="o">)</span>
Number of locked <span class="nv">synchronizers</span> <span class="o">=</span> <span class="m">1</span>
- java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>@546aeec1
...
</pre></div>
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