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outputs"><!--[--><!--]--> Log command outputs <!--[--><!--]--></a><!----></li><li><a href="/en/doc/batch-support.html" class="sidebar-item" aria-label="Batch Processing"><!--[--><!--]--> Batch Processing <!--[--><!--]--></a><!----></li><li><p tabindex="0" class="sidebar-item">How to use ognl <!----></p><ul style="" class="sidebar-item-children"><!--[--><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues/11" rel="noopener noreferrer" target="_blank" aria-label="Basic ognl example"><!--[--><!--]--><span>Basic ognl example</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 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class="sidebar-item" aria-label="memory"><!--[--><!--]--> memory <!--[--><!--]--></a><!----></li><li><a href="/en/doc/ognl.html" class="sidebar-item" aria-label="ognl"><!--[--><!--]--> ognl <!--[--><!--]--></a><!----></li><li><a href="/en/doc/perfcounter.html" class="sidebar-item" aria-label="perfcounter"><!--[--><!--]--> perfcounter <!--[--><!--]--></a><!----></li><li><a href="/en/doc/sysenv.html" class="sidebar-item" aria-label="sysenv"><!--[--><!--]--> sysenv <!--[--><!--]--></a><!----></li><li><a href="/en/doc/sysprop.html" class="sidebar-item" aria-label="sysprop"><!--[--><!--]--> sysprop <!--[--><!--]--></a><!----></li><li><a href="/en/doc/thread.html" class="sidebar-item" aria-label="thread"><!--[--><!--]--> thread <!--[--><!--]--></a><!----></li><li><a href="/en/doc/vmoption.html" class="sidebar-item" aria-label="vmoption"><!--[--><!--]--> vmoption <!--[--><!--]--></a><!----></li><li><a href="/en/doc/vmtool.html" class="sidebar-item" aria-label="vmtool"><!--[--><!--]--> vmtool 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class="sidebar-item" aria-label="help"><!--[--><!--]--> help <!--[--><!--]--></a><!----></li><li><a href="/en/doc/history.html" class="sidebar-item" aria-label="history"><!--[--><!--]--> history <!--[--><!--]--></a><!----></li><li><a href="/en/doc/keymap.html" class="sidebar-item" aria-label="keymap"><!--[--><!--]--> keymap <!--[--><!--]--></a><!----></li><li><a href="/en/doc/pwd.html" class="sidebar-item" aria-label="pwd"><!--[--><!--]--> pwd <!--[--><!--]--></a><!----></li><li><a href="/en/doc/quit.html" class="sidebar-item" aria-label="quit"><!--[--><!--]--> quit <!--[--><!--]--></a><!----></li><li><a href="/en/doc/reset.html" class="sidebar-item" aria-label="reset"><!--[--><!--]--> reset <!--[--><!--]--></a><!----></li><li><a href="/en/doc/session.html" class="sidebar-item" aria-label="session"><!--[--><!--]--> session <!--[--><!--]--></a><!----></li><li><a href="/en/doc/stop.html" class="sidebar-item" aria-label="stop"><!--[--><!--]--> stop <!--[--><!--]--></a><!----></li><li><a 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Contents</div><div class="right-menu-content" 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=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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