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<div class="section" id="vmtool">
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<h1>vmtool<a class="headerlink" href="#vmtool" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>@since 3.5.1</p>
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</div></blockquote>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-vmtool"><code class="docutils literal notranslate"><span class="pre">vmtool</span></code>在线教程</a></p>
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<p><code class="docutils literal notranslate"><span class="pre">vmtool</span></code> 利用<code class="docutils literal notranslate"><span class="pre">JVMTI</span></code>接口，实现查询内存对象，强制GC等功能。</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference external" href="https://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html">JVM Tool Interface</a></li>
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</ul>
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</div>
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<div class="section" id="id1">
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<h2>获取对象<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ vmtool --action getInstances --className java.lang.String --limit 10
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@String[][
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com.taobao.arthas.core.shell.session.Session],
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/],
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@String[java/util/concurrent/ConcurrentHashMap$ValueIterator],
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@String[java/util/concurrent/locks/LockSupport],
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]</pre></div>
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</div>
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<blockquote>
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<div><p>通过 <code class="docutils literal notranslate"><span class="pre">--limit</span></code>参数，可以限制返回值数量，避免获取超大数据时对JVM造成压力。默认值是10。</p>
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</div></blockquote>
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</div>
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<div class="section" id="classloader-name">
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<h2>指定 classloader name<a class="headerlink" href="#classloader-name" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext</pre></div>
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</div>
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</div>
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<div class="section" id="classloader-hash">
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<h2>指定 classloader hash<a class="headerlink" href="#classloader-hash" title="永久链接至标题">¶</a></h2>
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<p>可以通过<code class="docutils literal notranslate"><span class="pre">sc</span></code>命令查找到加载class的 classloader。</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ sc -d org.springframework.context.ApplicationContext
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class-info org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
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code-source file:/private/tmp/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/
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name org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
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...
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class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2
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+-sun.misc.Launcher$AppClassLoader@75b84c92
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+-sun.misc.Launcher$ExtClassLoader@4f023edb
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classLoaderHash 19469ea2</pre></div>
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</div>
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<p>然后用<code class="docutils literal notranslate"><span class="pre">-c</span></code>/<code class="docutils literal notranslate"><span class="pre">--classloader</span></code> 参数指定：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext</pre></div>
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</div>
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</div>
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<div class="section" id="id2">
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<h2>指定返回结果展开层数<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<blockquote>
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<div><p><code class="docutils literal notranslate"><span class="pre">getInstances</span></code> action返回结果绑定到<code class="docutils literal notranslate"><span class="pre">instances</span></code>变量上，它是数组。</p>
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</div></blockquote>
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<blockquote>
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<div><p>通过 <code class="docutils literal notranslate"><span class="pre">-x</span></code>/<code class="docutils literal notranslate"><span class="pre">--expand</span></code> 参数可以指定结果的展开层次，默认值是1。</p>
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</div></blockquote>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext -x 2</pre></div>
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</div>
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</div>
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<div class="section" id="id3">
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<h2>执行表达式<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<blockquote>
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<div><p><code class="docutils literal notranslate"><span class="pre">getInstances</span></code> action返回结果绑定到<code class="docutils literal notranslate"><span class="pre">instances</span></code>变量上，它是数组。可以通过<code class="docutils literal notranslate"><span class="pre">--express</span></code>参数执行指定的表达式。</p>
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</div></blockquote>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext --express 'instances[0].getBeanDefinitionNames()'</pre></div>
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<h2>强制GC<a class="headerlink" href="#gc" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action forceGc</pre></div>
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<li><p>可以结合 <a class="reference internal" href="vmoption.html"><span class="doc">vmoption</span></a> 命令动态打开<code class="docutils literal notranslate"><span class="pre">PrintGC</span></code>开关。</p></li>
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