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<li class="toctree-l2 current"><a class="current reference internal" href="#">profiler</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#id1">启动profiler</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#sample">获取已采集的sample的数量</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#svg">生成svg格式结果</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#arthas-outputprofiler">通过浏览器查看arthas-output下面的profiler结果</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#profilerevents">profiler支持的events</a></li>
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<li>profiler</li>
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<div class="section" id="profiler">
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<h1>profiler<a class="headerlink" href="#profiler" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>使用<a class="reference external" href="https://github.com/jvm-profiling-tools/async-profiler">async-profiler</a>生成火焰图</p>
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</div></blockquote>
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<p><code class="docutils literal notranslate"><span class="pre">profiler</span></code> 命令支持生成应用热点的火焰图。本质上是通过不断的采样，然后把收集到的采样结果生成火焰图。</p>
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<p><code class="docutils literal notranslate"><span class="pre">profiler</span></code> 命令基本运行结构是 <code class="docutils literal notranslate"><span class="pre">profiler</span> <span class="pre">action</span> <span class="pre">[actionArg]</span></code></p>
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<div class="section" id="id1">
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<h2>启动profiler<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<div class="highlight-default notranslate"><pre class="literal-block">$ profiler start
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Started [cpu] profiling</pre>
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</div>
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<blockquote>
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<div><p>默认情况下，生成的是cpu的火焰图，即event为<code class="docutils literal notranslate"><span class="pre">cpu</span></code>。可以用<code class="docutils literal notranslate"><span class="pre">--event</span></code>参数来指定。</p>
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</div></blockquote>
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</div>
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<div class="section" id="sample">
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<h2>获取已采集的sample的数量<a class="headerlink" href="#sample" title="永久链接至标题">¶</a></h2>
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<div class="highlight-default notranslate"><pre class="literal-block">$ profiler getSamples
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23</pre>
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</div>
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</div>
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<div class="section" id="id2">
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<h2>查看profiler状态<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler status
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[cpu] profiling is running for 4 seconds</pre></div>
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</div>
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<p>可以查看当前profiler在采样哪种<code class="docutils literal notranslate"><span class="pre">event</span></code>和采样时间。</p>
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</div>
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<div class="section" id="id3">
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<h2>停止profiler<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<div class="section" id="svg">
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<h3>生成svg格式结果<a class="headerlink" href="#svg" title="永久链接至标题">¶</a></h3>
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<div class="highlight-default notranslate"><pre class="literal-block">$ profiler stop
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profiler output file: /tmp/demo/arthas-output/20191125-135546.svg
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OK</pre>
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</div>
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<p>默认情况下，生成的结果保存到应用的<code class="docutils literal notranslate"><span class="pre">工作目录</span></code>下的<code class="docutils literal notranslate"><span class="pre">arthas-output</span></code>目录。可以通过 <code class="docutils literal notranslate"><span class="pre">--file</span></code>参数来指定输出结果路径。比如：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler stop --file /tmp/output.svg
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profiler output file: /tmp/output.svg
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OK</pre></div>
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</div>
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</div>
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<div class="section" id="html">
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<h3>生成html格式结果<a class="headerlink" href="#html" title="永久链接至标题">¶</a></h3>
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<p>默认情况下，结果文件是<code class="docutils literal notranslate"><span class="pre">svg</span></code>格式，如果想生成<code class="docutils literal notranslate"><span class="pre">html</span></code>格式，可以用<code class="docutils literal notranslate"><span class="pre">--format</span></code>参数指定：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler stop --format html
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profiler output file: /tmp/test/arthas-output/20191125-143329.html
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OK</pre></div>
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</div>
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<p>或者在<code class="docutils literal notranslate"><span class="pre">--file</span></code>参数里用文件名指名格式。比如<code class="docutils literal notranslate"><span class="pre">--file</span> <span class="pre">/tmp/result.html</span></code> 。</p>
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</div>
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</div>
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<div class="section" id="arthas-outputprofiler">
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<h2>通过浏览器查看arthas-output下面的profiler结果<a class="headerlink" href="#arthas-outputprofiler" title="永久链接至标题">¶</a></h2>
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<p>默认情况下，arthas使用3658端口，则可以打开： <a class="reference external" href="http://localhost:3658/arthas-output/">http://localhost:3658/arthas-output/</a> 查看到<code class="docutils literal notranslate"><span class="pre">arthas-output</span></code>目录下面的profiler结果：</p>
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<p><img alt="_images/arthas-output.jpg" src="_images/arthas-output.jpg" /></p>
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<p>点击可以查看具体的结果：</p>
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<p><img alt="_images/arthas-output-svg.jpg" src="_images/arthas-output-svg.jpg" /></p>
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<blockquote>
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<div><p>如果是chrome浏览器，可能需要多次刷新。</p>
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</div></blockquote>
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</div>
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<div class="section" id="profilerevents">
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<h2>profiler支持的events<a class="headerlink" href="#profilerevents" title="永久链接至标题">¶</a></h2>
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<p>在不同的平台，不同的OS下面，支持的events各有不同。比如在macos下面：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler list
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Basic events:
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cpu
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alloc
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lock
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wall
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itimer</pre></div>
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</div>
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<p>在linux下面</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler list
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Basic events:
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cpu
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alloc
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lock
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wall
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itimer
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Perf events:
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page-faults
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context-switches
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cycles
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instructions
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cache-references
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cache-misses
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branches
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branch-misses
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bus-cycles
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L1-dcache-load-misses
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LLC-load-misses
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dTLB-load-misses
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mem:breakpoint
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trace:tracepoint</pre></div>
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</div>
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<p>如果遇到OS本身的权限/配置问题，然后缺少部分event，可以参考<code class="docutils literal notranslate"><span class="pre">async-profiler</span></code>本身文档：<a class="reference external" href="https://github.com/jvm-profiling-tools/async-profiler">async-profiler</a></p>
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<p>可以用<code class="docutils literal notranslate"><span class="pre">--event</span></code>参数指定要采样的事件，比如对<code class="docutils literal notranslate"><span class="pre">alloc</span></code>事件进入采样：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler start --event alloc</pre></div>
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</div>
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</div>
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<div class="section" id="id4">
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<h2>恢复采样<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler resume
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Started [cpu] profiling</pre></div>
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</div>
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<p><code class="docutils literal notranslate"><span class="pre">start</span></code>和<code class="docutils literal notranslate"><span class="pre">resume</span></code>的区别是：<code class="docutils literal notranslate"><span class="pre">start</span></code>是新开始采样，<code class="docutils literal notranslate"><span class="pre">resume</span></code>会保留上次<code class="docutils literal notranslate"><span class="pre">stop</span></code>时的数据。</p>
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<p>通过执行<code class="docutils literal notranslate"><span class="pre">profiler</span> <span class="pre">getSamples</span></code>可以查看samples的数量来验证。</p>
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</div>
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<div class="section" id="execute">
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<h2>使用<code class="docutils literal notranslate"><span class="pre">execute</span></code>来执行复杂的命令<a class="headerlink" href="#execute" title="永久链接至标题">¶</a></h2>
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<p>比如开始采样：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler execute 'start'</pre></div>
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</div>
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<p>停止采样，并保存到指定文件里：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler execute 'stop,file=/tmp/result.svg'</pre></div>
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</div>
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<p>具体的格式参考： <a class="reference external" href="https://github.com/jvm-profiling-tools/async-profiler/blob/v1.6/src/arguments.cpp#L34">arguments.cpp#L34</a></p>
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</div>
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<div class="section" id="action">
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<h2>查看所有支持的action<a class="headerlink" href="#action" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler actions
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Supported Actions: [resume, dumpCollapsed, getSamples, start, list, execute, version, stop, load, dumpFlat, actions, dumpTraces, status]</pre></div>
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</div>
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</div>
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<div class="section" id="id5">
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<h2>查看版本<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
|
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler version
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Async-profiler 1.6 built on Sep 9 2019
|
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Copyright 2019 Andrei Pangin</pre></div>
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