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perfcounter
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===
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> 查看当前JVM的 Perf Counter信息
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### 使用参考
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```
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$ perfcounter
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java.ci.totalTime 2325637411
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java.cls.loadedClasses 3403
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java.cls.sharedLoadedClasses 0
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java.cls.sharedUnloadedClasses 0
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java.cls.unloadedClasses 0
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java.property.java.version 11.0.4
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java.property.java.vm.info mixed mode
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java.property.java.vm.name OpenJDK 64-Bit Server VM
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...
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```
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可以用`-d`参数打印更多信息：
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```
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$ perfcounter -d
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Name Variability Units Value
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---------------------------------------------------------------------------------
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java.ci.totalTime Monotonic Ticks 3242526906
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java.cls.loadedClasses Monotonic Events 3404
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java.cls.sharedLoadedClasses Monotonic Events 0
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java.cls.sharedUnloadedClasses Monotonic Events 0
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java.cls.unloadedClasses Monotonic Events 0
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```
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### jdk9以上的应用
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如果没有打印出信息，应用在启动时，加下面的参数：
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```
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--add-opens java.base/jdk.internal.perf=ALL-UNNAMED --add-exports java.base/jdk.internal.perf=ALL-UNNAMED
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```
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<li class="toctree-l3"><a class="reference internal" href="#id1">使用参考</a></li>
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<div class="section" id="perfcounter">
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<h1>perfcounter<a class="headerlink" href="#perfcounter" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>查看当前JVM的 Perf Counter信息</p>
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</div></blockquote>
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<div class="section" id="id1">
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<h2>使用参考<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<div class="highlight-default notranslate"><pre class="literal-block">$ perfcounter
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java.ci.totalTime 2325637411
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java.cls.loadedClasses 3403
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java.cls.sharedLoadedClasses 0
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java.cls.sharedUnloadedClasses 0
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java.cls.unloadedClasses 0
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java.property.java.version 11.0.4
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java.property.java.vm.info mixed mode
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java.property.java.vm.name OpenJDK 64-Bit Server VM
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...</pre>
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</div>
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<p>可以用<code class="docutils literal notranslate"><span class="pre">-d</span></code>参数打印更多信息：</p>
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<div class="highlight-default notranslate"><pre class="literal-block">$ perfcounter -d
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Name Variability Units Value
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---------------------------------------------------------------------------------
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java.ci.totalTime Monotonic Ticks 3242526906
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java.cls.loadedClasses Monotonic Events 3404
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java.cls.sharedLoadedClasses Monotonic Events 0
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java.cls.sharedUnloadedClasses Monotonic Events 0
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java.cls.unloadedClasses Monotonic Events 0</pre>
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</div>
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</div>
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<div class="section" id="jdk9">
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<h2>jdk9以上的应用<a class="headerlink" href="#jdk9" title="永久链接至标题">¶</a></h2>
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<p>如果没有打印出信息，应用在启动时，加下面的参数：</p>
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<div class="highlight-default notranslate"><pre class="literal-block">--add-opens java.base/jdk.internal.perf=ALL-UNNAMED --add-exports java.base/jdk.internal.perf=ALL-UNNAMED</pre>
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