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<li class="toctree-l4"><a class="reference internal" href="#id6">trace多个类或者多个函数</a></li>
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<div class="section" id="trace">
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<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><p>方法内部调用路径，并输出方法路径上的每个节点上耗时</p>
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</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="id1">
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<h2>参数说明<a class="headerlink" href="#id1" 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><p>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></p></li>
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<li><p>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></p></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>watch/stack/trace这个三个命令都支持<code class="docutils literal notranslate"><span class="pre">#cost</span></code></p>
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</div></blockquote>
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</div>
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<div class="section" id="id2">
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<h2>注意事项<a class="headerlink" href="#id2" 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="id3">
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<h2>使用参考<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<div class="section" id="demo">
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<h3>启动 Demo<a class="headerlink" href="#demo" title="永久链接至标题">¶</a></h3>
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<p>启动<a class="reference internal" href="quick-start.html"><span class="doc">快速入门</span></a>里的<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>。</p>
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</div>
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<div class="section" id="id4">
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<h3>trace函数<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ trace demo.MathGame run
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 42 ms.
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`---ts=2018-12-04 00:44:17;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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`---[10.611029ms] demo.MathGame:run()
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+---[0.05638ms] java.util.Random:nextInt()
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+---[10.036885ms] demo.MathGame:primeFactors()
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`---[0.170316ms] demo.MathGame:print()</pre></div>
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</div>
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</div>
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<div class="section" id="jdk">
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<h3>过滤掉jdk的函数<a class="headerlink" href="#jdk" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ trace -j demo.MathGame run
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 31 ms.
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`---ts=2018-12-04 01:09:14;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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`---[5.190646ms] demo.MathGame:run()
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+---[4.465779ms] demo.MathGame:primeFactors()
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`---[0.375324ms] demo.MathGame:print()</pre></div>
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</div>
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<ul class="simple">
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<li><p><code class="docutils literal notranslate"><span class="pre">-j</span></code>: jdkMethodSkip, skip jdk method trace</p></li>
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</ul>
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</div>
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<div class="section" id="id5">
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<h3>据调用耗时过滤<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ trace demo.MathGame run '#cost > 10'
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 41 ms.
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`---ts=2018-12-04 01:12:02;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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`---[12.033735ms] demo.MathGame:run()
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+---[0.006783ms] java.util.Random:nextInt()
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+---[11.852594ms] demo.MathGame:primeFactors()
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`---[0.05447ms] demo.MathGame:print()</pre></div>
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</div>
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<blockquote>
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<div><p>只会展示耗时大于10ms的调用路径，有助于在排查问题的时候，只关注异常情况</p>
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</div></blockquote>
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<ul class="simple">
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<li><p>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。</p></li>
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<li><p>[12.033735ms] 的含义，<code class="docutils literal notranslate"><span class="pre">12.033735</span></code> 的含义是：当前节点在当前步骤的耗时，单位为毫秒</p></li>
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<li><p>[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</p></li>
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<li><p>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</p></li>
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</ul>
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</div>
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<div class="section" id="id6">
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<h3>trace多个类或者多个函数<a class="headerlink" href="#id6" title="永久链接至标题">¶</a></h3>
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<p>trace命令只会trace匹配到的函数里的子调用，并不会向下trace多层。因为trace是代价比较贵的，多层trace可能会导致最终要trace的类和函数非常多。</p>
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<p>可以用正则表匹配路径上的多个类和函数，一定程度上达到多层trace的效果。</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">trace -E com.test.ClassA|org.test.ClassB method1|method2|method3</pre></div>
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