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<div class="section" id="dashboard">
<h1>dashboard<a class="headerlink" href="#dashboard" title="永久链接至标题"></a></h1>
<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&amp;id=command-dashboard"><code class="docutils literal notranslate"><span class="pre">dashboard</span></code>在线教程</a></p>
<blockquote>
<div><p>当前系统的实时数据面板,按 ctrl+c 退出。</p>
</div></blockquote>
<p>当运行在Ali-tomcat时会显示当前tomcat的实时信息如HTTP请求的qps, rt, 错误数, 线程池信息等等。</p>
<div class="section" id="id1">
<h2>参数说明<a class="headerlink" href="#id1" 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">[i:]</td>
<td align="left">刷新实时数据的时间间隔 (ms)默认5000ms</td>
</tr>
<tr>
<td align="right">[n:]</td>
<td align="left">刷新实时数据的次数</td>
</tr>
</tbody>
</table></div>
<div class="section" id="id2">
<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题"></a></h2>
<div class="highlight-default notranslate"><pre class="literal-block">$ dashboard
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
-1 C2 CompilerThread0 - -1 - 1.55 0.077 0:8.684 false true
53 Timer-for-arthas-dashboard-07b system 5 RUNNABLE 0.08 0.004 0:0.004 false true
22 scheduling-1 main 5 TIMED_WAI 0.06 0.003 0:0.287 false false
-1 C1 CompilerThread0 - -1 - 0.06 0.003 0:2.171 false true
-1 VM Periodic Task Thread - -1 - 0.03 0.001 0:0.092 false true
49 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.02 0.001 0:0.156 false true
16 Catalina-utility-1 main 1 TIMED_WAI 0.0 0.000 0:0.029 false false
-1 G1 Young RemSet Sampling - -1 - 0.0 0.000 0:0.019 false true
17 Catalina-utility-2 main 1 WAITING 0.0 0.000 0:0.025 false false
34 http-nio-8080-ClientPoller main 5 RUNNABLE 0.0 0.000 0:0.016 false true
23 http-nio-8080-BlockPoller main 5 RUNNABLE 0.0 0.000 0:0.011 false true
-1 VM Thread - -1 - 0.0 0.000 0:0.032 false true
-1 Service Thread - -1 - 0.0 0.000 0:0.006 false true
-1 GC Thread#5 - -1 - 0.0 0.000 0:0.043 false true
Memory used total max usage GC
heap 36M 70M 4096M 0.90% gc.g1_young_generation.count 12
g1_eden_space 6M 18M -1 33.33% 86
g1_old_gen 30M 50M 4096M 0.74% gc.g1_old_generation.count 0
g1_survivor_space 491K 2048K -1 24.01% gc.g1_old_generation.time(ms) 0
nonheap 66M 69M -1 96.56%
codeheap_&#x27;non-nmethods&#x27; 1M 2M 5M 22.39%
metaspace 46M 47M -1 98.01%
Runtime
os.name Mac OS X
os.version 10.15.4
java.version 15
java.home /Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home
systemload.average 10.68
processors 8
uptime 272s</pre>
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<div class="section" id="id3">
<h2>数据说明<a class="headerlink" href="#id3" title="永久链接至标题"></a></h2>
<ul class="simple">
<li><p>ID: Java级别的线程ID注意这个ID不能跟jstack中的nativeID一一对应。</p></li>
<li><p>NAME: 线程名</p></li>
<li><p>GROUP: 线程组名</p></li>
<li><p>PRIORITY: 线程优先级, 1~10之间的数字越大表示优先级越高</p></li>
<li><p>STATE: 线程的状态</p></li>
<li><p>CPU%: 线程的cpu使用率。比如采样间隔1000ms某个线程的增量cpu时间为100ms则cpu使用率=100/1000=10%</p></li>
<li><p>DELTA_TIME: 上次采样之后线程运行增量CPU时间数据格式为<code class="docutils literal notranslate"><span class="pre"></span></code></p></li>
<li><p>TIME: 线程运行总CPU时间数据格式为<code class="docutils literal notranslate"><span class="pre">分:秒</span></code></p></li>
<li><p>INTERRUPTED: 线程当前的中断位状态</p></li>
<li><p>DAEMON: 是否是daemon线程</p></li>
</ul>
<div class="section" id="jvm">
<h3>JVM内部线程<a class="headerlink" href="#jvm" title="永久链接至标题"></a></h3>
<p>Java 8之后支持获取JVM内部线程CPU时间这些线程只有名称和CPU时间没有ID及状态等信息显示ID为-1
通过内部线程可以观测到JVM活动如GC、JIT编译等占用CPU情况方便了解JVM整体运行状况。</p>
<ul class="simple">
<li><p>当JVM 堆(heap)/元数据(metaspace)空间不足或OOM时可以看到GC线程的CPU占用率明显高于其他的线程。</p></li>
<li><p>当执行<code class="docutils literal notranslate"><span class="pre">trace/watch/tt/redefine</span></code>等命令后可以看到JIT线程活动变得更频繁。因为JVM热更新class字节码时清除了此class相关的JIT编译结果需要重新编译。</p></li>
</ul>
<p>JVM内部线程包括下面几种</p>
<ul class="simple">
<li><p>JIT编译线程: 如 <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>
<li><p>GC线程: 如<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>
<li><p>其它内部线程: 如<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>
</ul>
</div>
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<h2>截图展示<a class="headerlink" href="#id4" title="永久链接至标题"></a></h2>
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