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trace:com.sun.tools.attach"><!--[--><!--]--> Start arthas failed, exception stack trace:com.sun.tools.attach <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15731.html" class="sidebar-item" aria-label="arthas 过滤方法的阐述"><!--[--><!--]--> arthas 过滤方法的阐述 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11442.html" class="sidebar-item" aria-label="arthas 介绍一下"><!--[--><!--]--> arthas 介绍一下 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11468.html" class="sidebar-item" aria-label="arthas 怎么使用？"><!--[--><!--]--> arthas 怎么使用？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12706.html" class="sidebar-item" aria-label="arthas 火焰图 怎么看？"><!--[--><!--]--> arthas 火焰图 怎么看？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13509.html" class="sidebar-item" aria-label="通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大"><!--[--><!--]--> 通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大 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内存 情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13510.html" class="sidebar-item" aria-label="查看实时jvm内存大小"><!--[--><!--]--> 查看实时jvm内存大小 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14840.html" class="sidebar-item" aria-label="Unsupported class file major version 61 using arthas 3.6.3"><!--[--><!--]--> Unsupported class file major version 61 using arthas 3.6.3 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15736.html" class="sidebar-item" aria-label="arthas 中jad参数"><!--[--><!--]--> arthas 中jad参数 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11444.html" class="sidebar-item" aria-label="arthas 命令解释"><!--[--><!--]--> arthas 命令解释 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11784.html" class="sidebar-item" aria-label="arthas使用的各类方式有哪些？"><!--[--><!--]--> arthas使用的各类方式有哪些？ <!--[--><!--]--></a><!----></li><li><a 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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 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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 分析内存升高的方法"><!--[--><!--]--> arthas 分析内存升高的方法 <!--[--><!--]--></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="arthas 怎么查看内存情况？"><!--[--><!--]--> arthas 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 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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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ctimer
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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></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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ctimer
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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 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>
|
|
|
Copyright <span class="token number">2016</span>-2021 Andrei Pangin
|
|
|
</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>
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</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
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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，可以在指定的 Native 函数被执行时启动或终止性能分析。主要用途是分析特定的 JVM 阶段，比如 GC 和 Safepoint。需要使用特定 JVM 实现中的 Native 函数名，比如在 HotSpot JVM 中的 SafepointSynchronize::begin 和 SafepointSynchronize::end。</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，而不是独立的事件类型。无论选择哪种事件，Profiler 都可以正常工作，但只有在 VM 操作和 Safepoint 请求之间的事件会被记录下来。</p><p>现在，当使用 <code>--ttsp</code> 选项并指定 JFR 输出格式时，<code>profiler</code> 会在生成的 JFR 文件中自动包含 profiler.Window 事件。这些事件表示每次 Time-to-Safepoint 暂停的时间区间，使您无需依赖 JVM 日志即可分析这些暂停。</p><p>示例</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 start <span class="token parameter variable">--ttsp</span> <span class="token parameter variable">--format</span> 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>生成的 JFR 文件将包含 profiler.Window 事件，可以使用 JDK Mission Control 等工具查看和分析这些事件。</p><p><strong>注意事项:</strong></p><ul><li><p>profiler.Window 事件是通用的事件，适用于任何使用 --begin 和 --end 触发器的时间窗口，不仅限于 Safepoint 暂停。</p></li><li><p>在分析长时间的 Safepoint 暂停时，profiler.Window 事件可帮助您识别造成延迟的原因。</p></li><li><p>当使用 --ttsp 选项时，请确保使用 JFR 输出格式，以便能够生成并查看 profiler.Window 事件。</p></li></ul><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>CONFIG 参数:</p><ul><li>预置配置：CONFIG 可以是 profile，表示使用 $JAVA_HOME/lib/jfr 目录下预置的 profile 配置。</li><li>自定义配置文件：CONFIG 也可以是自定义的 JFR 配置文件（.jfc），此选项的值采用与 jcmd JFR.start 命令的 settings 选项相同的格式。</li><li>指定 JFR 事件列表：现在，可以直接在 --jfrsync 中指定要启用的 JFR 事件列表，而无需创建 .jfc 文件。要指定事件列表，请以 + 开头，多个事件用 + 分隔。</li></ul><p>示例：</p><p>使用预置的 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><p>直接指定 JFR 事件列表，例如启用 jdk.YoungGarbageCollection 和 jdk.OldGarbageCollection 事件：</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> +jdk.YoungGarbageCollection+jdk.OldGarbageCollection <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><p><strong>注意事项</strong></p><ul><li>当指定事件列表时，由于逗号 , 用于分隔不同的选项，因此事件之间使用加号 + 分隔。</li><li>如果 --jfrsync 参数不以 + 开头，则被视为预置配置名或 .jfc 配置文件的路径。</li><li>直接指定事件列表在目标应用运行在容器中时特别有用，无需额外的文件操作。</li></ul><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><h2 id="wall-选项" tabindex="-1"><a class="header-anchor" href="#wall-选项" aria-hidden="true">#</a> <code>--wall</code> 选项</h2><p>通过 --wall 选项，可以同时进行 CPU 和 Wall Clock 的性能分析。</p><ol><li>这种联合分析有助于更全面地识别和理解应用程序的性能瓶颈。</li><li>允许用户独立于 CPU 分析设置 Wall Clock 分析的采样间隔。比如，可以通过设置 -e cpu -i 10 --wall 200，将 CPU 采样间隔设为 10 毫秒，墙钟采样间隔设为 200 毫秒。</li><li>联合进行 CPU 和 Wall Clock 分析时，输出格式必须设置为 jfr。这一格式支持记录线程的状态信息（如 STATE_RUNNABLE 或 STATE_SLEEPING），从而区分不同类型的采样事件。</li></ol><p>可参考 <a href="https://github.com/async-profiler/async-profiler/issues/740" target="_blank" rel="noopener noreferrer">async-profiler Github pr#740<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><p>影响：</p><p>Linux 平台: 这个新功能仅在 Linux 平台上有效。macOS 上的 CPU 分析引擎已经基于 Wall clock 模式，因此没有额外的收益。 性能开销: 启用 Wall clock 分析会增加性能开销，因此在同时分析 CPU 和 Wall clock 时，建议增加 Wall clock 的间隔。</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">-i</span> <span class="token number">10</span> <span class="token parameter variable">--wall</span> <span class="token number">100</span> <span class="token parameter variable">-f</span> out.jfr
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="ctimer事件" tabindex="-1"><a class="header-anchor" href="#ctimer事件" aria-hidden="true">#</a> <code>ctimer</code>事件</h2><p><code>ctimer</code> 事件是一种新的 CPU 采样模式，基于 <code>timer_create</code>，提供了无需 <code>perf_events</code> 的精确 CPU 采样。</p><p>在某些情况下，<code>perf_events</code> 可能不可用，例如由于 <code>perf_event_paranoid</code> 设置或 <code>seccomp</code> 限制，或者在容器环境中。虽然 itimer 事件可以在容器中工作，但可能存在采样不准确的问题。</p><p><code>ctimer</code> 事件结合了 <code>cpu</code> 和 <code>itimer</code> 的优点：</p><ul><li>高准确性：提供精确的 CPU 采样。</li><li>容器友好：默认在容器中可用。</li><li>低资源消耗：不消耗文件描述符。</li></ul><p><strong>请注意，<code>ctimer</code> 事件目前仅在 <code>Linux</code> 上支持，不支持 <code>macOS</code>。</strong> 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/855" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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><p>示例：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-e</span> ctimer <span class="token parameter variable">-o</span> jfr <span class="token parameter variable">-f</span> ./out-test.jfr
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="vtable特性" tabindex="-1"><a class="header-anchor" href="#vtable特性" aria-hidden="true">#</a> <code>vtable</code>特性</h2><p>在某些应用程序中，大量的 CPU 时间花费在调用 <code>megamorphic</code> 的虚方法或接口方法上，这在性能分析中显示为 <code>vtable stub</code> 或 <code>itable stub</code>。这无法帮助我们了解特定调用点为何是<code>megamorphic</code> 以及如何优化它。</p><p>vtable 特性可以在<code> vtable stub</code> 或 <code>itable stub</code> 之上添加一个伪帧，显示实际调用的对象类型。这有助于清楚地了解在特定调用点，不同接收者的比例。</p><p>该特性默认禁用，可以通过 <code>-F vtable</code> 选项启用（或使用 <code>features=vtable</code>）。 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/736" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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><p>示例：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-F</span> vtable
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="comptask-特性" tabindex="-1"><a class="header-anchor" href="#comptask-特性" aria-hidden="true">#</a> <code>comptask</code> 特性</h2><p><code>profiler</code> 采样 JIT 编译器线程以及 Java 线程，可以显示 JIT 编译所消耗的 CPU 百分比。然而，Java 方法的编译资源消耗各不相同，了解哪些特定的 Java 方法在编译时消耗最多的 CPU 时间非常有用。</p><p><code>comptask</code> 特性可以在 <code>C1/C2</code> 的堆栈跟踪中添加一个虚拟帧，显示当前正在编译的任务，即正在编译的 Java 方法。</p><p>该特性默认禁用，可以通过<code> -F comptask</code> 选项启用（或使用 <code>features=comptask</code>）。 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/777" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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><p>示例：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">-F</span> comptask
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="配置替代的分析信号" tabindex="-1"><a class="header-anchor" href="#配置替代的分析信号" aria-hidden="true">#</a> 配置替代的分析信号</h2><p><code>profiler</code> 使用 <code>POSIX</code> 信号来进行性能分析。默认情况下，<code>SIGPROF</code> 用于 <code>CPU</code> 分析，<code>SIGVTALRM</code> 用于 <code>Wall-Clock</code> 分析。然而，如果应用程序也使用这些信号，或者希望同时运行多个 <code>profiler</code> 实例，这可能会导致信号冲突。</p><p>现在，可以使用 <code>signal</code> 参数来配置用于分析的信号，以避免冲突。 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/759" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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><p>语法</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--signal</span> <span class="token operator"><</span>信号号码<span class="token operator">></span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>如果需要分别指定 CPU 和 Wall-Clock 分析的信号，可以使用以下语法：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--signal</span> <span class="token operator"><</span>CPU信号号码<span class="token operator">></span>/<span class="token operator"><</span>Wall信号号码<span class="token operator">></span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="clock-选项" tabindex="-1"><a class="header-anchor" href="#clock-选项" aria-hidden="true">#</a> <code>--clock</code> 选项</h2><p><code>--clock</code> 选项允许用户控制用于采样时间戳的时钟源。这对于需要将 <code>profiler</code> 的数据与其他工具的数据进行时间戳对齐的场景非常有用。</p><p>用法</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--clock</span> <span class="token operator"><</span>tsc<span class="token operator">|</span>monotonic<span class="token operator">></span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>参数</p><ul><li><code>tsc</code>：使用 CPU 的时间戳计数器（<code>RDTSC</code>）。这是默认选项，提供高精度的时间戳。</li><li><code>monotonic</code>：使用操作系统的单调时钟（<code>CLOCK_MONOTONIC</code>）。这有助于在多种数据源之间对齐时间戳。 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/723" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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。</li></ul><p>示例 :</p><p>使用 <code>CLOCK_MONOTONIC</code> 作为时间戳源：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--clock</span> monotonic
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>注意事项:</strong></p><ul><li>当需要将 <code>profiler</code> 的数据与其他使用 <code>CLOCK_MONOTONIC</code> 的工具（例如 <code>perf</code>）的数据进行对齐时，使用 <code>--clock monotonic</code>。</li><li>在使用 <code>jfrsync</code> 模式时，请谨慎使用 <code>--clock</code> 选项，因为 JVM 和 <code>profiler</code> 可能使用不同的时间戳源，这可能导致结果不一致。</li></ul><h2 id="norm-选项" tabindex="-1"><a class="header-anchor" href="#norm-选项" aria-hidden="true">#</a> <code>--norm</code> 选项</h2><p>在 Java 20 及更早的版本中，编译器为 <code>lambda</code> 表达式生成的方法名称包含唯一的数字后缀。例如，同一代码位置定义的 <code>lambda</code> 表达式，可能会生成多个不同的帧名称，因为每个 <code>lambda</code> 方法的名称都会附加一个唯一的数字后缀（如 <code>lambda$method$0</code>、<code>lambda$method$1</code> 等）。这会导致逻辑上相同的堆栈无法在火焰图中合并，增加了性能分析的复杂性。</p><p>为了解决这个问题，<code>profiler</code> 新增了 <code>--norm</code> 选项，可以在生成输出时自动规范化方法名称，去除这些数字后缀，使相同的堆栈能够正确地合并。 可参考 <a href="https://github.com/async-profiler/async-profiler/issues/832" target="_blank" rel="noopener noreferrer">async-profiler Github Issues<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><p><strong>示例:</strong></p><p>生成规范化的火焰图:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>profiler start <span class="token parameter variable">--norm</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></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: 18235787078@163.com">CrazyCoder</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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