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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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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-profiler"><code class="docutils literal notranslate"><span class="pre">profiler</span></code>在线教程</a></p>
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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>参数说明<a class="headerlink" href="#id1" title="永久链接至标题">¶</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">参数名称</th>
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<th align="left">参数说明</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>action</em></td>
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<td align="left">要执行的操作</td>
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</tr>
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<tr>
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<td align="right"><em>actionArg</em></td>
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<td align="left">属性名模式</td>
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</tr>
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<tr>
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<td align="right">[i:]</td>
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<td align="left">采样间隔（单位：ns）（默认值：10'000'000，即10 ms）</td>
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</tr>
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<tr>
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<td align="right">[f:]</td>
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<td align="left">将输出转储到指定路径</td>
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</tr>
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<tr>
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<td align="right">[d:]</td>
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<td align="left">运行评测指定秒</td>
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</tr>
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<tr>
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<td align="right">[e:]</td>
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<td align="left">要跟踪哪个事件（cpu, alloc, lock, cache-misses等），默认是cpu</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="id2">
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<h2>启动profiler<a class="headerlink" href="#id2" 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="id3">
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<h2>查看profiler状态<a class="headerlink" href="#id3" 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="id4">
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<h2>停止profiler<a class="headerlink" href="#id4" 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
|
|
|
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
|
|
|
Basic events:
|
|
|
cpu
|
|
|
alloc
|
|
|
lock
|
|
|
wall
|
|
|
itimer
|
|
|
Perf events:
|
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|
page-faults
|
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|
context-switches
|
|
|
cycles
|
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|
instructions
|
|
|
cache-references
|
|
|
cache-misses
|
|
|
branches
|
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|
branch-misses
|
|
|
bus-cycles
|
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|
L1-dcache-load-misses
|
|
|
LLC-load-misses
|
|
|
dTLB-load-misses
|
|
|
mem:breakpoint
|
|
|
trace:tracepoint</pre></div>
|
|
|
</div>
|
|
|
<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>
|
|
|
<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>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler start --event alloc</pre></div>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="id5">
|
|
|
<h2>恢复采样<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler resume
|
|
|
Started [cpu] profiling</pre></div>
|
|
|
</div>
|
|
|
<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>
|
|
|
<p>比如开始采样：</p>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler execute 'start,framebuf=5000000'</pre></div>
|
|
|
</div>
|
|
|
<p>停止采样，并保存到指定文件里：</p>
|
|
|
<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>
|
|
|
<p>具体的格式参考： <a class="reference external" href="https://github.com/jvm-profiling-tools/async-profiler/blob/v1.8.1/src/arguments.cpp#L50">arguments.cpp</a></p>
|
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</div>
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|
<div class="section" id="action">
|
|
|
<h2>查看所有支持的action<a class="headerlink" href="#action" title="永久链接至标题">¶</a></h2>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler actions
|
|
|
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="id6">
|
|
|
<h2>查看版本<a class="headerlink" href="#id6" title="永久链接至标题">¶</a></h2>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ profiler version
|
|
|
Async-profiler 1.6 built on Sep 9 2019
|
|
|
Copyright 2019 Andrei Pangin</pre></div>
|
|
|
</div>
|
|
|
</div>
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<div class="section" id="framebuf">
|
|
|
<h2>配置 framebuf 参数<a class="headerlink" href="#framebuf" title="永久链接至标题">¶</a></h2>
|
|
|
<blockquote>
|
|
|
<div><p>如果遇到生成的svg图片有 <code class="docutils literal notranslate"><span class="pre">[frame_buffer_overflow]</span></code>，则需要增大 framebuf（默认值是 1’000’000），可以显式配置，比如：</p>
|
|
|
</div></blockquote>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler start --framebuf 5000000</pre></div>
|
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|
</div>
|
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</div>
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<div class="section" id="include-exclude">
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|
<h2>配置 include/exclude 来过滤数据<a class="headerlink" href="#include-exclude" title="永久链接至标题">¶</a></h2>
|
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|
<p>如果应用比较复杂，生成的内容很多，想只关注部分数据，可以通过 include/exclude 来过滤。比如</p>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler start --include 'java/*' --include 'demo/*' --exclude '*Unsafe.park*'</pre></div>
|
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|
</div>
|
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|
<blockquote>
|
|
|
<div><p>include/exclude 都支持设置多个值 ，但是需要配置在命令行的最后。</p>
|
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|
</div></blockquote>
|
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</div>
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|
<div class="section" id="id7">
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<h2>指定执行时间<a class="headerlink" href="#id7" title="永久链接至标题">¶</a></h2>
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|
<p>比如，希望profiler执行 300 秒自动结束，可以用 <code class="docutils literal notranslate"><span class="pre">-d</span></code>/<code class="docutils literal notranslate"><span class="pre">--duration</span></code> 参数指定：</p>
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|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">profiler start --duration 300</pre></div>
|
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</div>
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</div>
|
|
|
<div class="section" id="jfr">
|
|
|
<h2>生成 jfr格式结果<a class="headerlink" href="#jfr" title="永久链接至标题">¶</a></h2>
|
|
|
<blockquote>
|
|
|
<div><p>注意，jfr只支持在 <code class="docutils literal notranslate"><span class="pre">start</span></code>时配置。如果是在<code class="docutils literal notranslate"><span class="pre">stop</span></code>时指定，则不会生效。</p>
|
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</div></blockquote>
|
|
|
<div class="highlight-default notranslate"><pre class="literal-block">profiler start --file /tmp/test.jfr</pre>
|
|
|
</div>
|
|
|
<p><code class="docutils literal notranslate"><span class="pre">file</span></code>参数支持一些变量：</p>
|
|
|
<ul class="simple">
|
|
|
<li><p>时间戳： <code class="docutils literal notranslate"><span class="pre">--file</span> <span class="pre">/tmp/test-%t.jfr</span></code></p></li>
|
|
|
<li><p>进程ID： <code class="docutils literal notranslate"><span class="pre">--file</span> <span class="pre">/tmp/test-%p.jfr</span></code></p></li>
|
|
|
</ul>
|
|
|
<p>生成的结果可以用支持jfr格式的工具来查看。比如：</p>
|
|
|
<ul class="simple">
|
|
|
<li><p>JDK Mission Control ： https://github.com/openjdk/jmc</p></li>
|
|
|
<li><p>JProfiler ： https://github.com/alibaba/arthas/issues/1416</p></li>
|
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</ul>
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</div>
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</div>
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