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<div class="section" id="monitor">
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<span id="monitor"></span><h1>monitor<a class="headerlink" href="#monitor" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div>方法执行监控</div></blockquote>
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<p>对匹配 <code class="docutils literal notranslate"><span class="pre">class-pattern</span></code>／<code class="docutils literal notranslate"><span class="pre">method-pattern</span></code>的类、方法的调用进行监控。</p>
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<p><code class="docutils literal notranslate"><span class="pre">monitor</span></code> 命令是一个非实时返回命令，实时返回命令是输入之后立即返回，而非实时返回的命令，则是不断的等待目标 Java 进程返回信息，直到用户输入 <code class="docutils literal notranslate"><span class="pre">Ctrl+C</span></code> 为止。服务端是以任务的形式在后台跑任务，植入的代码随着任务的中止而被不会被执行，所以任务关闭后，不会对原有性能产生太大影响，而且原则上，任何 Arthas 的命令也不会引起任何原有业务逻辑的改变。</p>
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<div class="section" id="">
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<span id="id1"></span><h2>监控的维度说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">监控项</th>
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<th align="left">说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right">timestamp</td>
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<td align="left">时间戳</td>
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</tr>
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<tr>
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<td align="right">class</td>
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<td align="left">Java类</td>
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</tr>
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<tr>
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<td align="right">method</td>
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<td align="left">方法（构造方法、普通方法）</td>
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</tr>
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<tr>
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<td align="right">total</td>
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<td align="left">调用次数</td>
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</tr>
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<tr>
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<td align="right">success</td>
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<td align="left">成功次数</td>
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</tr>
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<tr>
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<td align="right">fail</td>
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<td align="left">失败次数</td>
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</tr>
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<tr>
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<td align="right">rt</td>
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<td align="left">平均RT</td>
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</tr>
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<tr>
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<td align="right">fail-rate</td>
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<td align="left">失败率</td>
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</tbody>
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</table></div>
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<div class="section" id="">
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<span id="id2"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<p>方法拥有一个命名参数 <code class="docutils literal notranslate"><span class="pre">[c:]</span></code>，意思是统计周期（cycle of output），拥有一个整形的参数值</p>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">类名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><em>method-pattern</em></td>
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<td align="left">方法名表达式匹配</td>
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</tr>
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<tr>
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<td align="right">[E]</td>
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<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
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<tr>
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<td align="right"><code>[c:]</code></td>
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<td align="left">统计周期，默认值为120秒</td>
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</table></div>
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<div class="section" id="">
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<span id="id3"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ monitor -c <span class="m">5</span> com.alibaba.sample.petstore.web.store.module.screen.ItemList execute
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Press Ctrl+C to abort.
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Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">36</span> ms.
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:40 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">10</span> <span class="m">10</span> <span class="m">0</span> <span class="m">2</span>.00 <span class="m">0</span>.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:45 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">11</span> <span class="m">11</span> <span class="m">0</span> <span class="m">2</span>.18 <span class="m">0</span>.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:50 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">0</span> <span class="m">0</span> <span class="m">0</span> <span class="m">0</span>.00 <span class="m">0</span>.00%
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</pre></div>
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