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<div class="section" id="trace">
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<span id="trace"></span><h1>trace<a class="headerlink" href="#trace" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div>方法内部调用路径，并输出方法路径上的每个节点上耗时</div></blockquote>
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<p><code class="docutils literal notranslate"><span class="pre">trace</span></code> 命令能主动搜索 <code class="docutils literal notranslate"><span class="pre">class-pattern</span></code>／<code class="docutils literal notranslate"><span class="pre">method-pattern</span></code> 对应的方法调用路径，渲染和统计整个调用链路上的所有性能开销和追踪调用链路。</p>
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<div class="section" id="">
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<span id="id1"></span><h2>参数说明<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">参数名称</th>
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<th align="left">参数说明</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"><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"><em>condition-express</em></td>
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<td align="left">条件表达式</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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<tr>
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<td align="right"><code>[n:]</code></td>
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<td align="left">命令执行次数</td>
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</tr>
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<tr>
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<td align="right"><code>#cost</code></td>
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<td align="left">方法执行耗时</td>
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</tr>
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</tbody>
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</table><p>这里重点要说明的是观察表达式，观察表达式的构成主要由 ognl 表达式组成，所以你可以这样写<code class="docutils literal notranslate"><span class="pre">"{params,returnObj}"</span></code>，只要是一个合法的 ognl 表达式，都能被正常支持。</p>
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<p>观察的维度也比较多，主要体现在参数 <code class="docutils literal notranslate"><span class="pre">advice</span></code> 的数据结构上。<code class="docutils literal notranslate"><span class="pre">Advice</span></code> 参数最主要是封装了通知节点的所有信息。</p>
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<p>请参考<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中关于该节点的描述。</p>
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<ul class="simple">
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<li>特殊用法请参考：<a class="reference external" href="https://github.com/alibaba/arthas/issues/71">https://github.com/alibaba/arthas/issues/71</a></li>
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<li>OGNL表达式官网：<a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">https://commons.apache.org/proper/commons-ognl/language-guide.html</a></li>
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</ul>
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<p>很多时候我们只想看到某个方法的rt大于某个时间之后的trace结果，现在Arthas可以按照方法执行的耗时来进行过滤了，例如<code class="docutils literal notranslate"><span class="pre">trace</span> <span class="pre">*StringUtils</span> <span class="pre">isBlank</span> <span class="pre">'$cost>100'</span></code>表示当执行时间超过100ms的时候，才会输出trace的结果。</p>
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<blockquote>
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<div><p>注意：</p>
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<ol class="simple">
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<li>watch/stack/trace这个三个命令都支持$cost</li>
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<li>如果是Arthas 3.0，请把<code class="docutils literal notranslate"><span class="pre">$cost</span></code>改为<code class="docutils literal notranslate"><span class="pre">#cost</span></code></li>
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</ol>
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</div></blockquote>
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</div>
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<div class="section" id="">
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<span id="id2"></span><h2>注意事项<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">trace</span></code> 能方便的帮助你定位和发现因 RT 高而导致的性能问题缺陷，但其每次只能跟踪一级方法的调用链路。</p>
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</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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<p>代码示例：</p>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span> <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o"><</span><span class="n">String</span><span class="o">>();</span>
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<span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"a"</span><span class="o">);</span>
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<span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"b"</span><span class="o">);</span>
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<span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list2</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o"><</span><span class="n">String</span><span class="o">>();</span>
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<span class="n">list2</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"c"</span><span class="o">);</span>
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<span class="n">list2</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"d"</span><span class="o">);</span>
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<span class="kt">int</span> <span class="n">len</span> <span class="o">=</span> <span class="n">add</span><span class="o">(</span><span class="n">list</span><span class="o">,</span> <span class="n">list2</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="kd">private</span> <span class="kd">static</span> <span class="kt">int</span> <span class="nf">add</span><span class="o">(</span><span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list</span><span class="o">,</span> <span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list2</span><span class="o">)</span> <span class="o">{</span>
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<span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">10</span><span class="o">;</span>
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<span class="k">while</span> <span class="o">(</span><span class="n">i</span> <span class="o">>=</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">try</span> <span class="o">{</span>
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<span class="n">hehe</span><span class="o">(</span><span class="n">i</span><span class="o">);</span>
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<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">Throwable</span> <span class="n">t</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">t</span><span class="o">.</span><span class="na">printStackTrace</span><span class="o">();</span>
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<span class="o">}</span>
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<span class="n">i</span><span class="o">--;</span>
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<span class="o">}</span>
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<span class="n">list</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">list2</span><span class="o">);</span>
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<span class="k">return</span> <span class="n">list</span><span class="o">.</span><span class="na">size</span><span class="o">();</span>
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<span class="o">}</span>
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<span class="kd">private</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">hehe</span><span class="o">(</span><span class="kt">int</span> <span class="n">i</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">i</span> <span class="o">==</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">throw</span> <span class="k">new</span> <span class="n">RuntimeException</span><span class="o">(</span><span class="s">"ZERO"</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</pre></div>
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</div>
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<p>监测 <code class="docutils literal notranslate"><span class="pre">add</span></code> 方法：</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ trace com.alibaba.sample.petstore.web.store.module.screen.ItemList add params.length<span class="o">==</span><span class="m">2</span>
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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">144</span> ms.
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<span class="sb">`</span>---Tracing...
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<span class="sb">`</span>---<span class="o">[</span>2ms<span class="o">]</span>com.alibaba.sample.petstore.web.store.module.screen.ItemList:add<span class="o">()</span>
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+---<span class="o">[</span><span class="m">0</span>,0,0ms,11<span class="o">]</span>com.alibaba.sample.petstore.web.store.module.screen.ItemList:hehe<span class="o">()</span> <span class="o">[</span>throws Exception<span class="o">]</span>
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+---<span class="o">[</span>1ms<span class="o">]</span>java.lang.Throwable:printStackTrace<span class="o">()</span>
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+---<span class="o">[</span>0ms<span class="o">]</span>java.util.List:addAll<span class="o">()</span>
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<span class="sb">`</span>---<span class="o">[</span>0ms<span class="o">]</span>java.util.List:size<span class="o">()</span>
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</pre></div>
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</div>
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<p>按照耗时过滤：</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ trace com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="c1">#cost>4</span>
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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">159</span> ms.
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trace com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="c1">#cost>4</span>
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<span class="sb">`</span>---thread_name<span class="o">=</span>http-nio-8080-exec-5<span class="p">;</span><span class="nv">id</span><span class="o">=</span>2c<span class="p">;</span><span class="nv">is_daemon</span><span class="o">=</span>true<span class="p">;</span><span class="nv">priority</span><span class="o">=</span><span class="m">5</span><span class="p">;</span><span class="nv">TCCL</span><span class="o">=</span>com.taobao.pandora.boot.embedded.tomcat.TomcatEmbeddedWebappClassLoader
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<span class="sb">`</span>---<span class="o">[</span><span class="m">8</span>.866586ms<span class="o">]</span> com.alibaba.sample.petstore.web.store.module.screen.ItemList:execute<span class="o">()</span>
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+---<span class="o">[</span><span class="m">2</span>.847106ms<span class="o">]</span> com.alibaba.sample.petstore.biz.StoreManager:getAllProductItems<span class="o">()</span>
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+---<span class="o">[</span><span class="m">0</span>.765544ms<span class="o">]</span> com.alibaba.sample.petstore.dal.dao.ProductDao:getProductById<span class="o">()</span>
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+---<span class="o">[</span><span class="m">0</span>.021204ms<span class="o">]</span> com.alibaba.sample.petstore.dal.dataobject.Product:getCategoryId<span class="o">()</span>
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+---<span class="o">[</span><span class="m">1</span>.341532ms<span class="o">]</span> com.alibaba.sample.petstore.dal.dao.CategoryDao:getCategoryById<span class="o">()</span>
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<span class="sb">`</span>---<span class="o">[</span><span class="nv">min</span><span class="o">=</span><span class="m">0</span>.005428ms,max<span class="o">=</span><span class="m">0</span>.094064ms,total<span class="o">=</span><span class="m">0</span>.105228ms,count<span class="o">=</span><span class="m">3</span><span class="o">]</span> com.alibaba.citrus.turbine.Context:put<span class="o">()</span>
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</pre></div>
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</div>
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<blockquote>
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<div>只会展示耗时大于4ms的调用路径，有助于在排查问题的时候，只关注异常情况</div></blockquote>
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<ul class="simple">
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<li>是不是很眼熟，没错，在 JProfiler 等收费软件中你曾经见识类似的功能，这里你将可以通过命令就能打印出指定调用路径。 友情提醒下，<code class="docutils literal notranslate"><span class="pre">trace</span></code> 在执行的过程中本身是会有一定的性能开销，在统计的报告中并未像 JProfiler 一样预先减去其自身的统计开销。所以这统计出来有些许的不准，渲染路径上调用的类、方法越多，性能偏差越大。但还是能让你看清一些事情的。</li>
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<li>[2ms] 的含义，<code class="docutils literal notranslate"><span class="pre">2</span></code> 的含义是：当前节点在当前步骤的耗时，单位为毫秒</li>
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<li>[0,0,0ms,11]xxx:yyy() [throws Exception]，对该方法中相同的方法调用进行了合并，<code class="docutils literal notranslate"><span class="pre">0,0,0ms,11</span></code> 表示方法调用耗时，<code class="docutils literal notranslate"><span class="pre">min,max,total,count</span></code>；<code class="docutils literal notranslate"><span class="pre">throws</span> <span class="pre">Exception</span></code> 表明该方法调用中存在异常返回</li>
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<li>这里存在一个统计不准确的问题，就是所有方法耗时加起来可能会小于该监测方法的总耗时，这个是由于 Arthas 本身的逻辑会有一定的耗时</li>
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