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3.0.5
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<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/en/thread.md" class="fa fa-github"> Edit on GitHub</a>
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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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<blockquote>
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<div>Check the basic info and stack trace of the target thread.</div></blockquote>
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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"><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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</tbody>
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</table><blockquote>
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<div>How the CPU ratios are calculated? <br/><br/>
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CPU ratio for a given thread is the CPU time it takes divided by the total CPU time within a specified interval period. It is calculated in the following way: sample CPU times for all the thread by calling <tt class="docutils literal">java.lang.management.ThreadMXBean#getThreadCpuTime</tt> first, then sleep for a period (the default value is 100ms, which can be specified by <tt class="docutils literal">-i</tt>), then sample CPU times again. By this, we can get the time cost for this period for each thread, then come up with the ratio. <br/><br/>
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Note: this operation consumes CPU time too (<tt class="docutils literal">getThreadCpuTime</tt> 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/><br/>
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If you’d like to check the CPU ratios from the very beginning 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.</div></blockquote>
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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-threads-with-detailed-stack-trace">
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<span id="list-the-top-n-busiest-threads-with-detailed-stack-trace"></span><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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"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)
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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-threads-info-when-no-options-provided">
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<span id="list-all-threads-info-when-no-options-provided"></span><h3>List all threads’ info when no options provided<a class="headerlink" href="#list-all-threads-info-when-no-options-provided" title="Permalink to this headline">¶</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
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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-id-show-the-running-stack-for-the-target-thread">
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<span id="thread-id-show-the-running-stack-for-the-target-thread"></span><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>
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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)
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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-b-locate-the-thread-bocking-the-others">
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<span id="thread-b-locate-the-thread-bocking-the-others"></span><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>
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<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 <tt class="docutils literal">thread -b</tt> to find the problematic thread in one single command.</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
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at java.lang.Thread.sleep(Native Method)
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at test.arthas.TestThreadBlocking.doGet(TestThreadBlocking.java:22)
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- locked java.lang.Object@725be470 <---- but blocks 4 other threads!
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at test.filter.TestDurexFilter.doFilter(TestDurexFilter.java:46)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
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|
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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$FilterChainAdapter.doFilter(ContextLoadFilterValve.java:191)
|
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|
at com.taobao.eagleeye.EagleEyeFilter.doFilter(EagleEyeFilter.java:81)
|
|
|
at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke(ContextLoadFilterValve.java:150)
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|
|
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
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|
|
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
|
|
|
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
|
|
|
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:429)
|
|
|
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
|
|
|
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
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|
|
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>
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|
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</div>
|
|
|
<blockquote>
|
|
|
<div>Note: By now Arthas only supports to locate the thread blocked by <tt class="docutils literal">synchronzied</tt>, while <tt class="docutils literal">java.util.concurrent.Lock</tt> is not supported yet.</div></blockquote>
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|
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</div>
|
|
|
<div class="section" id="thread-i-specify-the-sampling-interval">
|
|
|
<span id="thread-i-specify-the-sampling-interval"></span><h3>thread -i, specify the sampling interval<a class="headerlink" href="#thread-i-specify-the-sampling-interval" title="Permalink to this headline">¶</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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