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<div class="section" id="thread">
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<span id="thread"></span><h1>thread<a class="headerlink" href="#thread" title="Permalink to this headline">¶</a></h1>
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<p>Check the basic profile and stack trace of the threads.</p>
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<div class="section" id="parameters">
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<span id="parameters"></span><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">[n:]</td>
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<td align="left">the top n busiest with stack traces</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">locate the threads blocking 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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</tbody>
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</table><p>How to get the CPU ratios?</p>
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<blockquote>
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<div>Within an <em>specified</em> interval, the time cost by the thread compared to the total CPU time.
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Take a sample (using <code class="docutils literal notranslate"><span class="pre">java.lang.management.ThreadMXBean#getThreadCpuTime</span></code>) to get the CPU time cost for all the threads and after a <em>specified</em> interval (default <em>100 ms</em>, which can be specified by <code class="docutils literal notranslate"><span class="pre">-i</span></code>), take another sample and we have the CPU time cost and the ratios naturally.</div></blockquote>
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<blockquote>
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<div>Attention: this kind of operation will take time, to decrease the extra cost, you’d better expand the interval to like <code class="docutils literal notranslate"><span class="pre">5000</span> <span class="pre">ms</span></code> for less performance overhead.</div></blockquote>
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<p>F.Y.I</p>
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<p>If you’d like to check the CPU ratios from the very start 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 be a help.</p>
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</div>
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<div class="section" id="usage">
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<span id="usage"></span><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-with-detailed-stack-trace">
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<span id="list-the-top-n-busiest-with-detailed-stack-trace"></span><h3>List the top n busiest with detailed stack trace<a class="headerlink" href="#list-the-top-n-busiest-with-detailed-stack-trace" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ thread -n <span class="m">3</span>
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<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
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at sun.management.ThreadImpl.dumpThreads0<span class="o">(</span>Native Method<span class="o">)</span>
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at sun.management.ThreadImpl.getThreadInfo<span class="o">(</span>ThreadImpl.java:440<span class="o">)</span>
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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>
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at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute<span class="o">(</span>AbstractCommandHandler.java:238<span class="o">)</span>
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at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand<span class="o">(</span>DefaultCommandHandler.java:67<span class="o">)</span>
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at com.taobao.arthas.core.server.ArthasServer<span class="nv">$4</span>.run<span class="o">(</span>ArthasServer.java:276<span class="o">)</span>
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at java.util.concurrent.ThreadPoolExecutor.runWorker<span class="o">(</span>ThreadPoolExecutor.java:1145<span class="o">)</span>
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at java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>.run<span class="o">(</span>ThreadPoolExecutor.java:615<span class="o">)</span>
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at java.lang.Thread.run<span class="o">(</span>Thread.java:745<span class="o">)</span>
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Number of locked <span class="nv">synchronizers</span> <span class="o">=</span> <span class="m">1</span>
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- java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>@6cd0b6f8
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<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
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at java.lang.Thread.sleep<span class="o">(</span>Native Method<span class="o">)</span>
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at com.taobao.arthas.core.server.DefaultSessionManager<span class="nv">$2</span>.run<span class="o">(</span>DefaultSessionManager.java:85<span class="o">)</span>
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<span class="s2">"Reference Handler"</span> <span class="nv">Id</span><span class="o">=</span><span class="m">2</span> <span class="nv">cpuUsage</span><span class="o">=</span><span class="m">0</span>% WAITING on java.lang.ref.Reference<span class="nv">$Lock</span>@69ba0f27
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at java.lang.Object.wait<span class="o">(</span>Native Method<span class="o">)</span>
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- waiting on java.lang.ref.Reference<span class="nv">$Lock</span>@69ba0f27
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at java.lang.Object.wait<span class="o">(</span>Object.java:503<span class="o">)</span>
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at java.lang.ref.Reference<span class="nv">$ReferenceHandler</span>.run<span class="o">(</span>Reference.java:133<span class="o">)</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="list-all-info-when-no-options-provided">
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<span id="list-all-info-when-no-options-provided"></span><h3>List all info when no options provided<a class="headerlink" href="#list-all-info-when-no-options-provided" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ thread
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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>
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ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTE DAEMON
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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</pre></div>
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</div>
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</div>
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<div class="section" id="thread-thread-id-present-the-specified-thread-profile">
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<span id="thread-thread-id-present-the-specified-thread-profile"></span><h3>thread <thread_id> present the specified thread profile<a class="headerlink" href="#thread-thread-id-present-the-specified-thread-profile" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ thread <span class="m">1</span>
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<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>
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|
|
</div>
|
|
|
<div class="section" id="thread-b-locate-the-blocking-threads">
|
|
|
<span id="thread-b-locate-the-blocking-threads"></span><h3>thread -b locate the blocking threads<a class="headerlink" href="#thread-b-locate-the-blocking-threads" title="Permalink to this headline">¶</a></h3>
|
|
|
<p>Using <code class="docutils literal notranslate"><span class="pre">-b</span></code>, we can effectively locate the threads holding locks blocking other threads resulting in a frozen system.</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>Attention: only <code class="docutils literal notranslate"><span class="pre">synchronized</span></code> blocked threads can be located for now, <code class="docutils literal notranslate"><span class="pre">JUL</span></code> not supported yet.</div></blockquote>
|
|
|
</div>
|
|
|
<div class="section" id="thread-i-specify-the-collecting-interval">
|
|
|
<span id="thread-i-specify-the-collecting-interval"></span><h3>thread -i specify the collecting interval<a class="headerlink" href="#thread-i-specify-the-collecting-interval" title="Permalink to this headline">¶</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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|
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