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data-v-2b64a081><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="jfr" tabindex="-1"><a class="header-anchor" href="#jfr" aria-hidden="true">#</a> jfr</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-jfr" target="_blank" rel="noopener noreferrer"><code>jfr</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>Java Flight Recorder (JFR) 是一种用于收集有关正在运行的 Java 应用程序的诊断和分析数据的工具。它集成到 Java 虚拟机 (JVM) 中，几乎不会造成性能开销，因此即使在负载较重的生产环境中也可以使用。</p></div><p><code>jfr</code> 命令支持在程序动态运行过程中开启和关闭 JFR 记录。 记录收集有关 event 的数据。事件在特定时间点发生在 JVM 或 Java 应用程序中。每个事件都有一个名称、一个时间戳和一个可选的有效负载。负载是与事件相关的数据，例如 CPU 使用率、事件前后的 Java 堆大小、锁持有者的线程 ID 等。</p><p><code>jfr</code> 命令基本运行结构是 <code>jfr cmd [actionArg]</code></p><blockquote><p>注意： JDK8 的 8u262 版本之后才支持 jfr</p></blockquote><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>cmd</em></td><td style="text-align:left;">要执行的操作 支持的命令【start，status，dump，stop】</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;">[n:]</td><td style="text-align:left;">记录名称</td></tr><tr><td style="text-align:right;">[r:]</td><td style="text-align:left;">记录 id 值</td></tr><tr><td style="text-align:right;">[dumponexit:]</td><td style="text-align:left;">程序退出时，是否要 dump 出 .jfr 文件，默认为 false</td></tr><tr><td style="text-align:right;">[d:]</td><td style="text-align:left;">延迟多久后启动 JFR 记录，支持带单位配置，eg: 60s, 2m, 5h, 3d. 不带单位就是秒，默认无延迟</td></tr><tr><td style="text-align:right;">[duration:]</td><td style="text-align:left;">JFR 记录持续时间，支持单位配置，不带单位就是秒，默认一直记录</td></tr><tr><td style="text-align:right;">[s:]</td><td style="text-align:left;">采集 Event 的详细配置文件，默认是 default.jfc 位于 <code>$JAVA_HOME/lib/jfr/default.jfc</code></td></tr><tr><td style="text-align:right;">[f:]</td><td style="text-align:left;">将输出转储到指定路径</td></tr><tr><td style="text-align:right;">[maxage:]</td><td style="text-align:left;">缓冲区数据最大文件记录保存时间，支持单位配置，不带单位就是秒，默认是不限制</td></tr><tr><td style="text-align:right;">[maxsize:]</td><td style="text-align:left;">缓冲区的最大文件大小，支持单位配置， 不带单位是字节，m 或者 M 代表 MB，g 或者 G 代表 GB。</td></tr><tr><td style="text-align:right;">[state:]</td><td style="text-align:left;">jfr 记录状态</td></tr></tbody></table><h2 id="启动-jfr-记录" tabindex="-1"><a class="header-anchor" href="#启动-jfr-记录" aria-hidden="true">#</a> 启动 JFR 记录</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ jfr start
|