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20么？"><!--[--><!--]--> arthas 支持jdk 20么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15737.html" class="sidebar-item" aria-label="进程停了 arthas也会同步停止么？"><!--[--><!--]--> 进程停了 arthas也会同步停止么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11450.html" class="sidebar-item" aria-label="arthas 分析thread线程卡住"><!--[--><!--]--> arthas 分析thread线程卡住 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11795.html" class="sidebar-item" aria-label="使用arthas查看成员变量值具体怎么做？"><!--[--><!--]--> 使用arthas查看成员变量值具体怎么做？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12740.html" class="sidebar-item" aria-label="arthas怎么分析cpu很高"><!--[--><!--]--> arthas怎么分析cpu很高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13512.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15167.html" class="sidebar-item" aria-label="介绍一下arthas"><!--[--><!--]--> 介绍一下arthas <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15738.html" class="sidebar-item" aria-label="arthas如何查看hashmap的值"><!--[--><!--]--> arthas如何查看hashmap的值 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11451.html" class="sidebar-item" aria-label="arthas 怎么排查cpu占用过高？"><!--[--><!--]--> arthas 怎么排查cpu占用过高？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11809.html" class="sidebar-item" aria-label="linux下的arthas 具体怎么用？（使用教程）"><!--[--><!--]--> linux下的arthas 具体怎么用？（使用教程） <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12741.html" class="sidebar-item" aria-label="如何使用arthas查看系统哪个地方内存占用过大"><!--[--><!--]--> 如何使用arthas查看系统哪个地方内存占用过大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13513.html" class="sidebar-item" aria-label="arthas 监听成员变量值的方法是什么？"><!--[--><!--]--> arthas 监听成员变量值的方法是什么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15543.html" class="sidebar-item" aria-label="arthas中tt命令如何查看方法入参的具体命令"><!--[--><!--]--> arthas中tt命令如何查看方法入参的具体命令 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15739.html" class="sidebar-item" aria-label="arthas可以监听私有方法吗"><!--[--><!--]--> arthas可以监听私有方法吗 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11452.html" class="sidebar-item" aria-label="arthas 查看方法耗时"><!--[--><!--]--> arthas 查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11810.html" class="sidebar-item" aria-label="arthas查看方法耗时"><!--[--><!--]--> arthas查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13448.html" class="sidebar-item" aria-label="如何使用arthas分析慢查询"><!--[--><!--]--> 如何使用arthas分析慢查询 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13522.html" class="sidebar-item" aria-label="Connect to telnet server error: 127.0.0.1 3658"><!--[--><!--]--> Connect to telnet server error: 127.0.0.1 3658 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15726.html" class="sidebar-item" aria-label="arthas 如何查询static变量"><!--[--><!--]--> arthas 如何查询static变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15740.html" class="sidebar-item" aria-label="arthas 分析内存身高的方法"><!--[--><!--]--> arthas 分析内存身高的方法 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11453.html" class="sidebar-item" aria-label="arthas 怎样查看方法耗时"><!--[--><!--]--> arthas 怎样查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11814.html" class="sidebar-item" aria-label="arthas 怎么排查内存泄漏"><!--[--><!--]--> arthas 怎么排查内存泄漏 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13504.html" class="sidebar-item" aria-label="如何查看实时jvm内存大小占用"><!--[--><!--]--> 如何查看实时jvm内存大小占用 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14763.html" class="sidebar-item" aria-label="利用Arthas排查NoSuchMethodError"><!--[--><!--]--> 利用Arthas排查NoSuchMethodError <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15728.html" class="sidebar-item" aria-label="arthas 获取成员变量"><!--[--><!--]--> arthas 获取成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11454.html" class="sidebar-item" aria-label="arthas 常用命令介绍"><!--[--><!--]--> arthas 常用命令介绍 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12453.html" class="sidebar-item" aria-label="artahs 怎么查看内存情况？"><!--[--><!--]--> artahs 怎么查看内存情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13506.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14831.html" class="sidebar-item" aria-label="Dashboard 命令cpuUsage长期在90%左右"><!--[--><!--]--> Dashboard 命令cpuUsage长期在90%左右 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15729.html" class="sidebar-item" aria-label="arthas 怎么查看变量内容"><!--[--><!--]--> arthas 怎么查看变量内容 <!--[--><!--]--></a><!----></li><!--]--></ul></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="/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/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><p><code>profiler</code> 命令的格式基本与上游项目 <a href="https://github.com/async-profiler/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> 保持一致，详细的使用方式可参考上游项目的 README、Github Disscussions 以及其他文档资料。</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>参数指定其他性能分析模式，见下文。</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-profiling-状态" tabindex="-1"><a class="header-anchor" href="#查看-profiling-状态" aria-hidden="true">#</a> 查看 profiling 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="查看-profiler-自身的内存占用" tabindex="-1"><a class="header-anchor" href="#查看-profiler-自身的内存占用" aria-hidden="true">#</a> 查看 profiler 自身的内存占用</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ profiler meminfo
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Call trace storage: 10244 KB
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Dictionaries: 72 KB
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Code cache: 12890 KB
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------------------------------
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Total: 23206 KB
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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></div><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="生成火焰图格式结果" tabindex="-1"><a class="header-anchor" href="#生成火焰图格式结果" aria-hidden="true">#</a> 生成火焰图格式结果</h3><p>默认情况下，结果是 <a href="https://github.com/BrendanGregg/FlameGraph" target="_blank" rel="noopener noreferrer">Flame Graph<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> 格式的 <code>html</code> 文件，也可以用 <code>-o</code> 或 <code>--format</code> 参数指定其他内容格式，包括 flat、traces、collapsed、flamegraph、tree、jfr。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler stop <span class="token parameter variable">--format</span> flamegraph
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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>在<code>--file</code>参数指定的文件名后缀为 <code>html</code> 或 <code>jfr</code> 时，文件格式可以被推断出来。比如<code>--file /tmp/result.html</code> 将自动生成火焰图。</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="/images/arthas-output.jpg" alt=""></p><p>点击可以查看具体的结果：</p><p><img src="/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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Java method calls:
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ClassName.methodName
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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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branch-instructions
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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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rNNN
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pmu/event-descriptor/
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mem:breakpoint
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trace:tracepoint
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kprobe:func
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uprobe:path
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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 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 <a href="https://github.com/jvm-profiling-tools/async-profiler" target="_blank" rel="noopener noreferrer">async-profiler 的文档<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>可以使用 <code>check</code> action 测试某个 event 是否可用，此 action 的参数格式与 start 一致。</p><p>可以用<code>--event</code>参数指定要采样的事件，比如 <code>alloc</code> 表示分析内存分配情况：</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>会清除已有的分析结果重新开始，<code>resume</code>则会保留已有的结果，将新的分析结果附加到已有结果中。</p><p>通过执行<code>profiler getSamples</code>可以查看 samples 的数量来验证。</p><h2 id="dump-分析结果" tabindex="-1"><a class="header-anchor" href="#dump-分析结果" aria-hidden="true">#</a> Dump 分析结果</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ profiler dump
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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></div><p><code>dump</code> action 将性能分析的结果保存到默认文件或指定的文件中，但 profiling 过程不会停止。例如，如果使用 <code>start</code> action 启动 profiling，5 秒后执行 <code>dump</code> action，2 秒后再次执行 <code>dump</code> action，将会得到 2 个结果文件，第一个文件包括 0~5 秒的分析结果，第二个文件包括 0~7 秒的分析结果。</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/async-profiler/async-profiler/blob/v2.9/src/arguments.cpp#L52" 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, version, execute, meminfo, stop, load, dumpFlat, dump, actions, dumpTraces, status, check<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">2.9</span> built on May <span class="token number">8</span> <span class="token number">2023</span>
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|
Copyright <span class="token number">2016</span>-2021 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-java-栈深度" tabindex="-1"><a class="header-anchor" href="#配置-java-栈深度" aria-hidden="true">#</a> 配置 Java 栈深度</h2><p>可以使用 <code>-j</code> 或 <code>--jstackdepth</code> 选项指定最大 Java 栈深度。如果指定值大于默认值 2048，该选项会被忽略。当你不希望看到特别深的栈轨迹的时候，这个选项会很有用，以下是一个使用样例：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-j</span> <span class="token number">256</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="各线程分别进行-profiling" tabindex="-1"><a class="header-anchor" href="#各线程分别进行-profiling" aria-hidden="true">#</a> 各线程分别进行 profiling</h2><p>可以使用 <code>-t</code> 或 <code>--threads</code> 标志选项令 profiling 对各线程分别进行，每个栈轨迹都会以指示单个线程的帧结束。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-t</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 stack traces，可以通过 <code>--include/--exclude</code> 过滤 stack traces，<code>--include</code> 表示定义的匹配表达式必须出现在 stack traces，相反 <code>--exclude</code> 表示定义的匹配表达式一定不会出现在 stack traces。 匹配表达式可以以<code>*</code>开始或者结束,<code>*</code> 表示任何（可能为空）字符序列。 比如</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler stop <span class="token parameter variable">--include</span> <span class="token string">'java/*'</span> <span class="token parameter variable">--include</span> <span class="token string">'com/demo/*'</span> <span class="token parameter variable">--exclude</span> <span class="token string">'*Unsafe.park*'</span>
|
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><blockquote><p><code>--include/--exclude</code> 都支持多次设置，但是需要配置在命令行的最后。也可使用短参数格式 <code>-I/-X</code>。 注意<code>--include/--exclude</code>只支持在<code>stop</code>action或者带有<code>-d</code>/<code>--duration</code>参数的<code>start</code>action中指定，否则不生效。</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> 参数为 collect action 指定时间：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler collect <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
|
|
|
profiler start -o jfr
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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>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="控制分析结果的格式" tabindex="-1"><a class="header-anchor" href="#控制分析结果的格式" aria-hidden="true">#</a> 控制分析结果的格式</h2><p>使用 <code>-s</code> 选项将结果中的 Fully qualified name 替换为简单名称，如 <code>demo.MathGame.main</code> 替换为 <code>MathGame.main</code>。使用 <code>-g</code> 选项指定输出方法签名，如 <code>demo.MathGame.main</code> 替换为 <code>demo.MathGame.main([Ljava/lang/String;)V</code>。此外还有许多可调整分析结果格式的选项，可参考 <a href="https://github.com/async-profiler/async-profiler#readme" target="_blank" rel="noopener noreferrer">async-profiler 的 README 文档<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> 以及 <a href="https://github.com/async-profiler/async-profiler/discussions" target="_blank" rel="noopener noreferrer">async-profiler 的 Github Discussions<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> 等材料。</p><p>例如，以下命令中，<code>-s</code> 将输出中的类名称指定为简短格式，<code>-g</code> 显示方法的完整签名，<code>-a</code> 标注出 Java 方法，<code>-l</code> 为原生方法增加库名称，<code>--title</code> 为生成火焰图页面指定标题，<code>--minwidth</code> 将过滤火焰图中宽度为 15% 以下的帧，<code>--reverse</code> 将火焰图倒置。</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>profiler stop -s -g -a -l --title <flametitle> --minwidth 15 --reverse
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><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><h2 id="配置-locks-allocations-模式的阈值" tabindex="-1"><a class="header-anchor" href="#配置-locks-allocations-模式的阈值" aria-hidden="true">#</a> 配置 locks/allocations 模式的阈值</h2><p>当使用 lock 或 alloc event 进行 profiling 时，可以使用 <code>--lock</code> 或 <code>--alloc</code> 配置阈值，比如下列命令：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-e</span> lock <span class="token parameter variable">--lock</span> 10ms
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profiler start <span class="token parameter variable">-e</span> alloc <span class="token parameter variable">--alloc</span> 2m
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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>会记录竞争时间超过 10ms 的锁（如果不指定时间单位，则使用 ns 为单位），或者以 2MB 的单位记录对内存的分配。</p><h2 id="配置-jfr-块" tabindex="-1"><a class="header-anchor" href="#配置-jfr-块" aria-hidden="true">#</a> 配置 JFR 块</h2><p>当使用 JFR 作为输出格式时，可以使用 <code>--chunksize</code> 或 <code>--chunktime</code> 配置单个 JFR 块的大致容量（以 byte 为单位，默认 100 MB）和时间限制（默认值为 1 小时），比如：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-f</span> profile.jfr <span class="token parameter variable">--chunksize</span> 100m <span class="token parameter variable">--chunktime</span> 1h
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="将线程按照调度策略分组" tabindex="-1"><a class="header-anchor" href="#将线程按照调度策略分组" aria-hidden="true">#</a> 将线程按照调度策略分组</h2><p>可以使用 <code>--sched</code> 标志选项将输出结果按照 Linux 线程调度策略分组，策略包括 BATCH/IDLE/OTHER。例如：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--sched</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>火焰图的倒数第二行会标记不同的调度策略。</p><h2 id="仅用未销毁对象构建内存分析结果" tabindex="-1"><a class="header-anchor" href="#仅用未销毁对象构建内存分析结果" aria-hidden="true">#</a> 仅用未销毁对象构建内存分析结果</h2><p>使用 <code>--live</code> 标志选项在内存分析结果中仅保留那些在分析过程结束时仍未被 JVM 回收的对象。该选项在排查 Java 堆内存泄露问题时比较有用。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--live</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="配置收集-c-栈帧的方法" tabindex="-1"><a class="header-anchor" href="#配置收集-c-栈帧的方法" aria-hidden="true">#</a> 配置收集 C 栈帧的方法</h2><p>使用 <code>--cstack MODE</code> 配置收集 native 帧的方法。候选模式有 fp (Frame Pointer), dwarf (DWARF unwind info), lbr (Last Branch Record, 从 Linux 4.1 在 Haswell 可用), and no (不收集 native 栈帧).</p><p>默认情况下，C 栈帧会出现在 cpu、itimer、wall-clock、perf-events 模式中，而 Java 级别的 event 比如 alloc 和 lock 只收集 Java stack。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler <span class="token parameter variable">--cstack</span> fp
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>此命令将收集 native 栈帧的 Frame Pointer 信息。</p><h2 id="当指定-native-函数执行时开始-停止-profiling" tabindex="-1"><a class="header-anchor" href="#当指定-native-函数执行时开始-停止-profiling" aria-hidden="true">#</a> 当指定 native 函数执行时开始/停止 profiling</h2><p>使用 <code>--begin function</code> 和 <code>--end function</code> 选项在指定 native 函数被执行时让 profiling 过程启动或终止。主要用途是分析特定的 JVM 阶段，比如 GC 和安全点。需要使用特定 JVM 实现中的 native 函数名，比如 HotSpot JVM 中的 <code>SafepointSynchronize::begin</code> 和 <code>SafepointSynchronize::end</code>。</p><h3 id="time-to-safepoint-profiling" tabindex="-1"><a class="header-anchor" href="#time-to-safepoint-profiling" aria-hidden="true">#</a> Time-to-safepoint profiling</h3><p>选项 <code>--ttsp</code> 实际上是 <code>--begin SafepointSynchronize::begin --end RuntimeService::record_safepoint_synchronized</code> 的一个别名。它是一种约束而不是独立的 event 类型。无论选择哪种 event，profiler 都可以正常工作，但只有 VM 操作和 safepoint request 之间的事件会被记录下来。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--begin</span> SafepointSynchronize::begin <span class="token parameter variable">--end</span> RuntimeService::record_safepoint_synchronized
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profiler <span class="token parameter variable">--ttsp</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="使用-profiler-记录的-event-生成-jfr-文件" tabindex="-1"><a class="header-anchor" href="#使用-profiler-记录的-event-生成-jfr-文件" aria-hidden="true">#</a> 使用 profiler 记录的 event 生成 JFR 文件</h2><p>用 <code>--jfrsync CONFIG</code> 选项可以指定配置启动 Java Flight Recording，输出的 jfr 文件会包含所有常规的 JFR event，但采样的来源是由 profiler 提供的。</p><p><code>CONFIG</code> 选项可以是 <code>profile</code>，表示使用在 <code>$JAVA_HOME/lib/jfr</code> 目录下预置的“profile”配置，也可以是自定义的 JFR 配置文件（.jfc），此选项的值采用与 <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/jcmd.html" target="_blank" rel="noopener noreferrer">JFR.start 命令的 settings 选项<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> 相同的格式。</p><p>比如，以下命令使用“profile”配置启动 JFR：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-e</span> cpu <span class="token parameter variable">--jfrsync</span> profile <span class="token parameter variable">-f</span> combined.jfr
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="周期性保存结果" tabindex="-1"><a class="header-anchor" href="#周期性保存结果" aria-hidden="true">#</a> 周期性保存结果</h2><p>使用 <code>--loop TIME</code> 可以持续运行 profiler 并周期性保存结果。选项格式可以是具体时间 hh:mm:ss 或以秒、分钟、小时或天计算的时间间隔。需要确保指定的输出文件名中包含时间戳，否则每次输出的结果都会覆盖上次保存的结果。以下命令持续执行 profiling 并将每个小时内的记录保存到一个 jfr 文件中。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--loop</span> 1h <span class="token parameter variable">-f</span> /var/log/profile-%t.jfr
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="timeout-选项" tabindex="-1"><a class="header-anchor" href="#timeout-选项" aria-hidden="true">#</a> <code>--timeout</code> 选项</h2><p>这个选项指定 profiling 自动在多久后停止。该选项和 <code>--loop</code> 选项的格式一致，可以是时间点，也可以是一个时间间隔。这两个选项都是用于 <code>start</code> action 而不是 <code>collect</code> action 的。可参考 <a href="https://github.com/async-profiler/async-profiler/discussions/789" target="_blank" rel="noopener noreferrer">async-profiler Github Discussions<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> 了解更多信息。</p></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: wenchenghuang@mail.bnu.edu.cn">Winson Huang</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hengyunabc@users.noreply.github.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 68638598+Allan-QLB@users.noreply.github.com">Allan-QLB</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 983433479@qq.com">汪吉</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="/doc/perfcounter.html" class="" aria-label="perfcounter"><!--[--><!--]--> perfcounter <!--[--><!--]--></a></span><span class="next"><a href="/doc/pwd.html" class="" aria-label="pwd"><!--[--><!--]--> pwd <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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