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href="/3.x/doc/advanced-use.md" class="sidebar-item collapsible" aria-label="其他特性"><!--[--><!--]--> 其他特性 <!--[--><!--]--></a><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/3.x/doc/async.html" class="sidebar-item" aria-label="Arthas 后台异步任务"><!--[--><!--]--> Arthas 后台异步任务 <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/save-log.html" class="sidebar-item" aria-label="执行结果存日志"><!--[--><!--]--> 执行结果存日志 <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/docker.html" class="sidebar-item" aria-label="Docker"><!--[--><!--]--> Docker <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/web-console.html" class="sidebar-item" aria-label="Web Console"><!--[--><!--]--> Web Console <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/tunnel.html" class="sidebar-item" aria-label="Arthas Tunnel"><!--[--><!--]--> Arthas Tunnel <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/idea-plugin.html" class="sidebar-item" aria-label="IDEA Plugin"><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/arthas-properties.html" class="sidebar-item" aria-label="Arthas Properties"><!--[--><!--]--> Arthas Properties <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/agent.html" class="sidebar-item" aria-label="以 Java Agent 的方式启动"><!--[--><!--]--> 以 Java Agent 的方式启动 <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/spring-boot-starter.html" class="sidebar-item" aria-label="Arthas Spring Boot Starter"><!--[--><!--]--> Arthas Spring Boot Starter <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/http-api.html" class="sidebar-item" aria-label="Http API"><!--[--><!--]--> Http API <!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/batch-support.html" class="sidebar-item" aria-label="批处理功能"><!--[--><!--]--> 批处理功能 <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><a href="/3.x/doc/faq.html" class="sidebar-item" aria-label="FAQ"><!--[--><!--]--> FAQ <!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例"><!--[--><!--]--><span>用户案例</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas" rel="noopener noreferrer" target="_blank" aria-label="Star me at github"><!--[--><!--]--><span>Star me at github</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" rel="noopener noreferrer" target="_blank" aria-label="编译调试/参与贡献"><!--[--><!--]--><span>编译调试/参与贡献</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes"><!--[--><!--]--><span>Release Notes</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a href="/3.x/doc/contact-us.md" class="sidebar-item" aria-label="QQ 群/钉钉群"><!--[--><!--]--> QQ 群/钉钉群 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>目录</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="profiler" tabindex="-1"><a class="header-anchor" href="#profiler" aria-hidden="true">#</a> profiler</h1><p><a href="https://arthas.aliyun.com/3.x/doc/arthas-tutorials.html?language=cn&id=command-profiler" target="_blank" rel="noopener noreferrer"><code>profiler</code>在线教程<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>使用<a href="https://github.com/jvm-profiling-tools/async-profiler" target="_blank" rel="noopener noreferrer">async-profiler<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a>生成火焰图</p></div><p><code>profiler</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><p><code>profiler</code> 命令基本运行结构是 <code>profiler action [actionArg]</code></p><h2 id="参数说明" tabindex="-1"><a class="header-anchor" href="#参数说明" aria-hidden="true">#</a> 参数说明</h2><table><thead><tr><th style="text-align:right;">参数名称</th><th style="text-align:left;">参数说明</th></tr></thead><tbody><tr><td style="text-align:right;"><em>action</em></td><td style="text-align:left;">要执行的操作</td></tr><tr><td style="text-align:right;"><em>actionArg</em></td><td style="text-align:left;">属性名模式</td></tr><tr><td style="text-align:right;">[i:]</td><td style="text-align:left;">采样间隔（单位：ns）（默认值：10'000'000，即 10 ms）</td></tr><tr><td style="text-align:right;">[f:]</td><td style="text-align:left;">将输出转储到指定路径</td></tr><tr><td style="text-align:right;">[d:]</td><td style="text-align:left;">运行评测指定秒</td></tr><tr><td style="text-align:right;">[e:]</td><td style="text-align:left;">要跟踪哪个事件（cpu, alloc, lock, cache-misses 等），默认是 cpu</td></tr></tbody></table><h2 id="启动-profiler" tabindex="-1"><a class="header-anchor" href="#启动-profiler" aria-hidden="true">#</a> 启动 profiler</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ profiler start
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Started [cpu] profiling
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><div class="custom-container tip"><p class="custom-container-title">提示</p><p>默认情况下，生成的是 cpu 的火焰图，即 event 为<code>cpu</code>。可以用<code>--event</code>参数来指定。</p></div><h2 id="获取已采集的-sample-的数量" tabindex="-1"><a class="header-anchor" href="#获取已采集的-sample-的数量" aria-hidden="true">#</a> 获取已采集的 sample 的数量</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ profiler getSamples
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23
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="查看-profiler-状态" tabindex="-1"><a class="header-anchor" href="#查看-profiler-状态" aria-hidden="true">#</a> 查看 profiler 状态</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler status
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<span class="token punctuation">[</span>cpu<span class="token punctuation">]</span> profiling is running <span class="token keyword">for</span> <span class="token number">4</span> seconds
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>可以查看当前 profiler 在采样哪种<code>event</code>和采样时间。</p><h2 id="停止-profiler" tabindex="-1"><a class="header-anchor" href="#停止-profiler" aria-hidden="true">#</a> 停止 profiler</h2><h3 id="生成-html-格式结果" tabindex="-1"><a class="header-anchor" href="#生成-html-格式结果" aria-hidden="true">#</a> 生成 html 格式结果</h3><p>默认情况下，结果文件是<code>html</code>格式，也可以用<code>--format</code>参数指定：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler stop <span class="token parameter variable">--format</span> html
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profiler output file: /tmp/test/arthas-output/20211207-111550.html
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OK
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>或者在<code>--file</code>参数里用文件名指名格式。比如<code>--file /tmp/result.html</code> 。</p><h2 id="通过浏览器查看-arthas-output-下面的-profiler-结果" tabindex="-1"><a class="header-anchor" href="#通过浏览器查看-arthas-output-下面的-profiler-结果" aria-hidden="true">#</a> 通过浏览器查看 arthas-output 下面的 profiler 结果</h2><p>默认情况下，arthas 使用 3658 端口，则可以打开： <a href="http://localhost:3658/arthas-output/" target="_blank" rel="noopener noreferrer">http://localhost:3658/arthas-output/<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a> 查看到<code>arthas-output</code>目录下面的 profiler 结果：</p><p><img src="/3.x/images/arthas-output.jpg" alt=""></p><p>点击可以查看具体的结果：</p><p><img src="/3.x/images/arthas-output-svg.jpg" alt=""></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>如果是 chrome 浏览器，可能需要多次刷新。</p></div><h2 id="profiler-支持的-events" tabindex="-1"><a class="header-anchor" href="#profiler-支持的-events" aria-hidden="true">#</a> profiler 支持的 events</h2><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><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ 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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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>在 linux 下面</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ 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
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></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>async-profiler</code>本身文档：<a href="https://github.com/jvm-profiling-tools/async-profiler" target="_blank" rel="noopener noreferrer">async-profiler<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><p>可以用<code>--event</code>参数指定要采样的事件，比如对<code>alloc</code>事件进入采样：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler start <span class="token parameter variable">--event</span> alloc
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="恢复采样" tabindex="-1"><a class="header-anchor" href="#恢复采样" aria-hidden="true">#</a> 恢复采样</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler resume
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Started <span class="token punctuation">[</span>cpu<span class="token punctuation">]</span> profiling
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p><code>start</code>和<code>resume</code>的区别是：<code>start</code>是新开始采样，<code>resume</code>会保留上次<code>stop</code>时的数据。</p><p>通过执行<code>profiler getSamples</code>可以查看 samples 的数量来验证。</p><h2 id="使用execute来执行复杂的命令" tabindex="-1"><a class="header-anchor" href="#使用execute来执行复杂的命令" aria-hidden="true">#</a> 使用<code>execute</code>来执行复杂的命令</h2><p>比如开始采样：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler execute <span class="token string">'start,framebuf=5000000'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>停止采样，并保存到指定文件里：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler execute <span class="token string">'stop,file=/tmp/result.html'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>具体的格式参考： <a href="https://github.com/jvm-profiling-tools/async-profiler/blob/v2.5/src/arguments.cpp#L50" target="_blank" rel="noopener noreferrer">arguments.cpp<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><h2 id="查看所有支持的-action" tabindex="-1"><a class="header-anchor" href="#查看所有支持的-action" aria-hidden="true">#</a> 查看所有支持的 action</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler actions
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Supported Actions: <span class="token punctuation">[</span>resume, dumpCollapsed, getSamples, start, list, execute, version, stop, load, dumpFlat, actions, dumpTraces, status<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="查看版本" tabindex="-1"><a class="header-anchor" href="#查看版本" aria-hidden="true">#</a> 查看版本</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler version
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Async-profiler <span class="token number">1.6</span> built on Sep <span class="token number">9</span> <span class="token number">2019</span>
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Copyright <span class="token number">2019</span> Andrei Pangin
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="配置-framebuf-参数" tabindex="-1"><a class="header-anchor" href="#配置-framebuf-参数" aria-hidden="true">#</a> 配置 framebuf 参数</h2><blockquote><p>如果遇到生成的火焰图有 <code>[frame_buffer_overflow]</code>，则需要增大 framebuf（默认值是 1'000'000），可以显式配置，比如：</p></blockquote><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--framebuf</span> <span class="token number">5000000</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="配置-include-exclude-来过滤数据" tabindex="-1"><a class="header-anchor" href="#配置-include-exclude-来过滤数据" aria-hidden="true">#</a> 配置 include/exclude 来过滤数据</h2><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="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--include</span> <span class="token string">'java/*'</span> <span class="token parameter variable">--include</span> <span class="token string">'demo/*'</span> <span class="token parameter variable">--exclude</span> <span class="token string">'*Unsafe.park*'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><blockquote><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></blockquote><h2 id="指定执行时间" tabindex="-1"><a class="header-anchor" href="#指定执行时间" aria-hidden="true">#</a> 指定执行时间</h2><p>比如，希望 profiler 执行 300 秒自动结束，可以用 <code>-d</code>/<code>--duration</code> 参数指定：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--duration</span> <span class="token number">300</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="生成-jfr-格式结果" tabindex="-1"><a class="header-anchor" href="#生成-jfr-格式结果" aria-hidden="true">#</a> 生成 jfr 格式结果</h2><blockquote><p>注意，jfr 只支持在 <code>start</code>时配置。如果是在<code>stop</code>时指定，则不会生效。</p></blockquote><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>profiler start --file /tmp/test.jfr
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><code>file</code>参数支持一些变量：</p><ul><li>时间戳： <code>--file /tmp/test-%t.jfr</code></li><li>进程 ID： <code>--file /tmp/test-%p.jfr</code></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><li>JDK Mission Control ： https://github.com/openjdk/jmc</li><li>JProfiler ： https://github.com/alibaba/arthas/issues/1416</li></ul><h2 id="生成的火焰图里的-unknown" tabindex="-1"><a class="header-anchor" href="#生成的火焰图里的-unknown" aria-hidden="true">#</a> 生成的火焰图里的 unknown</h2><ul><li>https://github.com/jvm-profiling-tools/async-profiler/discussions/409</li></ul></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/profiler.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: anrun388@gmail.com">SiuHui</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/3.x/doc/perfcounter.html" class="" aria-label="perfcounter"><!--[--><!--]--> perfcounter <!--[--><!--]--></a></span><span class="next"><a href="/3.x/doc/pwd.html" class="" aria-label="pwd"><!--[--><!--]--> pwd <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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