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<div class="section" id="dashboard">
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<h1>dashboard<a class="headerlink" href="#dashboard" 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-dashboard"><code class="docutils literal notranslate"><span class="pre">dashboard</span></code> online tutorial</a></p>
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<blockquote>
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<div><p>This is the real time statistics dashboard for the current system, press <code class="docutils literal notranslate"><span class="pre">Ctrl+C</span></code> to exit.</p>
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</div></blockquote>
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<p>When running in Apache Tomcat Alibaba edition, the dashboard will also present the real time statistics of the tomcat, including <a class="reference external" href="https://en.wikipedia.org/wiki/Queries_per_second">QPS</a>, RT, error counts, and thread pool, etc.</p>
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<div class="section" id="options">
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<h2>Options<a class="headerlink" href="#options" 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">[i:]</td>
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<td align="left">The interval (in ms) between two executions, default is 5000 ms.</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 number of times this command will be executed.</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="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="highlight-default notranslate"><pre class="literal-block">$ dashboard
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ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
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-1 C2 CompilerThread0 - -1 - 1.55 0.077 0:8.684 false true
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53 Timer-for-arthas-dashboard-07b system 5 RUNNABLE 0.08 0.004 0:0.004 false true
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22 scheduling-1 main 5 TIMED_WAI 0.06 0.003 0:0.287 false false
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-1 C1 CompilerThread0 - -1 - 0.06 0.003 0:2.171 false true
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-1 VM Periodic Task Thread - -1 - 0.03 0.001 0:0.092 false true
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49 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.02 0.001 0:0.156 false true
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16 Catalina-utility-1 main 1 TIMED_WAI 0.0 0.000 0:0.029 false false
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-1 G1 Young RemSet Sampling - -1 - 0.0 0.000 0:0.019 false true
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17 Catalina-utility-2 main 1 WAITING 0.0 0.000 0:0.025 false false
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34 http-nio-8080-ClientPoller main 5 RUNNABLE 0.0 0.000 0:0.016 false true
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23 http-nio-8080-BlockPoller main 5 RUNNABLE 0.0 0.000 0:0.011 false true
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-1 VM Thread - -1 - 0.0 0.000 0:0.032 false true
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-1 Service Thread - -1 - 0.0 0.000 0:0.006 false true
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-1 GC Thread#5 - -1 - 0.0 0.000 0:0.043 false true
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Memory used total max usage GC
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heap 36M 70M 4096M 0.90% gc.g1_young_generation.count 12
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g1_eden_space 6M 18M -1 33.33% 86
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g1_old_gen 30M 50M 4096M 0.74% gc.g1_old_generation.count 0
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g1_survivor_space 491K 2048K -1 24.01% gc.g1_old_generation.time(ms) 0
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nonheap 66M 69M -1 96.56%
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codeheap_'non-nmethods' 1M 2M 5M 22.39%
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metaspace 46M 47M -1 98.01%
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Runtime
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os.name Mac OS X
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os.version 10.15.4
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java.version 15
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java.home /Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home
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systemload.average 10.68
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processors 8
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uptime 272s</pre>
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</div>
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</div>
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<div class="section" id="notes-on-column-headers">
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<h2>Notes on column headers<a class="headerlink" href="#notes-on-column-headers" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p>ID: JVM thread ID, pls. note this ID is different from the nativeID in jstack</p></li>
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<li><p>NAME: thread name</p></li>
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<li><p>GROUP: thread group name</p></li>
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<li><p>PRIORITY: thread priority, ranged from 1 to 10. The greater number, the higher priority</p></li>
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<li><p>STATE: thread state</p></li>
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<li><p>CPU%: the ratio of CPU usage for the thread. For example, the sampling interval is 1000ms, and the incremental cpu time
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of a thread is 100ms, then the cpu usage rate=100/1000=10%</p></li>
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<li><p>DELTA_TIME: incremental CPU time of thread running after the last sampling in <code class="docutils literal notranslate"><span class="pre">second</span></code> format</p></li>
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<li><p>TIME: total CPU time of the thread in <code class="docutils literal notranslate"><span class="pre">minute:second</span></code> format</p></li>
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<li><p>INTERRUPTED: the thread interruption state</p></li>
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<li><p>DAEMON: daemon thread or not</p></li>
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</ul>
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<div class="section" id="jvm-internal-threads">
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<h3>JVM internal threads<a class="headerlink" href="#jvm-internal-threads" title="Permalink to this headline">¶</a></h3>
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<p>After Java 8, it is supported to obtain the CPU time of JVM internal threads. These threads only have the name and CPU time,
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without ID and status information (display ID is -1).</p>
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<p>JVM activities can be observed through internal threads, such as GC, JIT compilation, etc., to perceive the overall status of JVM.</p>
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<ul class="simple">
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<li><p>When the JVM heap/metaspace space is insufficient or OOM, it can be seen that the CPU usage of the GC threads is
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significantly higher than other threads.</p></li>
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<li><p>After executing commands such as <code class="docutils literal notranslate"><span class="pre">trace/watch/tt/redefine</span></code>, you can see that JIT threads activities become more frequent.
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Because the JIT compilation data related to this class is cleared when the JVM hot update the class bytecode, it needs to be recompiled.</p></li>
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</ul>
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<p>JVM internal threads include the following:</p>
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<ul class="simple">
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<li><p>JIT compilation thread: such as <code class="docutils literal notranslate"><span class="pre">C1</span> <span class="pre">CompilerThread0</span></code>, <code class="docutils literal notranslate"><span class="pre">C2</span> <span class="pre">CompilerThread0</span></code></p></li>
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<li><p>GC thread: such as <code class="docutils literal notranslate"><span class="pre">GC</span> <span class="pre">Thread0</span></code>, <code class="docutils literal notranslate"><span class="pre">G1</span> <span class="pre">Young</span> <span class="pre">RemSet</span> <span class="pre">Sampling</span></code></p></li>
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<li><p>Other internal threads: such as<code class="docutils literal notranslate"><span class="pre">VM</span> <span class="pre">Periodic</span> <span class="pre">Task</span> <span class="pre">Thread</span></code>, <code class="docutils literal notranslate"><span class="pre">VM</span> <span class="pre">Thread</span></code>, <code class="docutils literal notranslate"><span class="pre">Service</span> <span class="pre">Thread</span></code></p></li>
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</ul>
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</div>
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</div>
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<div class="section" id="screenshot">
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<h2>Screenshot<a class="headerlink" href="#screenshot" title="Permalink to this headline">¶</a></h2>
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<p><img alt="_images/dashboard.png" src="_images/dashboard.png" /></p>
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