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Contents</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></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=en&id=command-jfr" target="_blank" rel="noopener noreferrer"><code>jfr</code> online tutorial<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">open in new window</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">TIP</p><p>Java Flight Recorder (JFR) is a tool for collecting diagnostic and profiling data about a running Java application. It is integrated into the Java Virtual Machine (JVM) and causes almost no performance overhead, so it can be used even in heavily loaded production environments.</p></div><p>The <code>jfr</code> command supports starting and stopping JFR recordings during dynamic program running. Recording collects data about <em>events</em>. Events occur in the JVM or the Java application at a specific point in time. Each event has a name, a time stamp, and an optional <em>payload</em>. The payload is the data associated with an event, for example, the CPU usage, the Java heap size before and after the event, the thread ID of the lock holder, and so on.</p><p>The basic usage of the <code>jfr</code> command is<code>jfr cmd [actionArg]</code></p><blockquote><p>Note: jfr is supported only after the 8u262 version of jdk8</p></blockquote><h3 id="supported-options" tabindex="-1"><a class="header-anchor" href="#supported-options" aria-hidden="true">#</a> Supported Options</h3><table><thead><tr><th style="text-align:right;">Name</th><th style="text-align:left;">Specification</th></tr></thead><tbody><tr><td style="text-align:right;"><em>cmd</em></td><td style="text-align:left;">Command to execute, support【start，status，dump，stop】</td></tr><tr><td style="text-align:right;"><em>actionArg</em></td><td style="text-align:left;">Attribute name pattern</td></tr><tr><td style="text-align:right;">[n:]</td><td style="text-align:left;">Name of recording</td></tr><tr><td style="text-align:right;">[r:]</td><td style="text-align:left;">Recording id</td></tr><tr><td style="text-align:right;">[dumponexit:]</td><td style="text-align:left;">When the program exits, whether to dump the .jfr file. (boolean false)</td></tr><tr><td style="text-align:right;">[d:]</td><td style="text-align:left;">Duration of recording, i.e. 60s, 2m, 5h, 3d. default no delay</td></tr><tr><td style="text-align:right;">[duration:]</td><td style="text-align:left;">Duration of recording, default forever.</td></tr><tr><td style="text-align:right;">[s:]</td><td style="text-align:left;">Server-side template, The default is default.jfc located at <code>$JAVA_HOME/lib/jfr/default.jfc</code></td></tr><tr><td style="text-align:right;">[f:]</td><td style="text-align:left;">Resulting recording filename</td></tr><tr><td style="text-align:right;">[maxage:]</td><td style="text-align:left;">Maximum age of buffer data</td></tr><tr><td style="text-align:right;">[maxsize:]</td><td style="text-align:left;">Maximum size of buffers in bytes</td></tr><tr><td style="text-align:right;">[state:]</td><td style="text-align:left;">Recording state</td></tr></tbody></table><h2 id="start-jfr-recording" tabindex="-1"><a class="header-anchor" href="#start-jfr-recording" aria-hidden="true">#</a> Start jfr recording</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ jfr start
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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><blockquote><p>notice: A recording can only be stopped once.</p></blockquote><p>You can also specify the record output path.</p><h2 id="view-jfr-recording-results-under-arthas-output-via-browser" tabindex="-1"><a class="header-anchor" href="#view-jfr-recording-results-under-arthas-output-via-browser" aria-hidden="true">#</a> View JFR recording results under arthas-output via browser</h2><p>By default, arthas uses http port 8563 , which can be opened:<a href="http://localhost:8563/arthas-output/" target="_blank" rel="noopener noreferrer">http://localhost:8563/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">open in new window</span></span></a> View the <code>arthas-output</code> directory below JFR recording results:</p><p><img src="/images/arthas-output-recording.png" alt=""></p><p>The resulting results can be viewed with tools that support the JFR format. Such as:</p><ul><li>JDK Mission Control ： https://github.com/openjdk/jmc</li></ul></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/jfr.md" rel="noopener noreferrer" target="_blank" aria-label="Edit this page on GitHub"><!--[--><!--]--><span>Edit this page on 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">open in new window</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">Contributors: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 108991596+longxu0509@users.noreply.github.com">longxu0509</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/en/doc/jad.html" class="" aria-label="jad"><!--[--><!--]--> jad <!--[--><!--]--></a></span><span class="next"><a href="/en/doc/jvm.html" class="" aria-label="jvm"><!--[--><!--]--> jvm <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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