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class="sidebar-item" aria-label="arthas 怎么查看堆内存太高"><!--[--><!--]--> arthas 怎么查看堆内存太高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13511.html" class="sidebar-item" aria-label="arthas方法运行后查看成员变量"><!--[--><!--]--> arthas方法运行后查看成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14843.html" class="sidebar-item" aria-label="arthas 支持jdk 20么？"><!--[--><!--]--> arthas 支持jdk 20么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15737.html" class="sidebar-item" aria-label="进程停了 arthas也会同步停止么？"><!--[--><!--]--> 进程停了 arthas也会同步停止么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11450.html" class="sidebar-item" aria-label="arthas 分析thread线程卡住"><!--[--><!--]--> arthas 分析thread线程卡住 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11795.html" class="sidebar-item" aria-label="使用arthas查看成员变量值具体怎么做？"><!--[--><!--]--> 使用arthas查看成员变量值具体怎么做？ 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aria-label="linux下的arthas 具体怎么用？（使用教程）"><!--[--><!--]--> linux下的arthas 具体怎么用？（使用教程） <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12741.html" class="sidebar-item" aria-label="如何使用arthas查看系统哪个地方内存占用过大"><!--[--><!--]--> 如何使用arthas查看系统哪个地方内存占用过大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13513.html" class="sidebar-item" aria-label="arthas 监听成员变量值的方法是什么？"><!--[--><!--]--> arthas 监听成员变量值的方法是什么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15543.html" class="sidebar-item" aria-label="arthas中tt命令如何查看方法入参的具体命令"><!--[--><!--]--> arthas中tt命令如何查看方法入参的具体命令 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15739.html" class="sidebar-item" aria-label="arthas可以监听私有方法吗"><!--[--><!--]--> arthas可以监听私有方法吗 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11452.html" class="sidebar-item" aria-label="arthas 查看方法耗时"><!--[--><!--]--> arthas 查看方法耗时 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href="/doc/expert/user-question-history11453.html" class="sidebar-item" aria-label="arthas 怎样查看方法耗时"><!--[--><!--]--> arthas 怎样查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11814.html" class="sidebar-item" aria-label="arthas 怎么排查内存泄漏"><!--[--><!--]--> arthas 怎么排查内存泄漏 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13504.html" class="sidebar-item" aria-label="如何查看实时jvm内存大小占用"><!--[--><!--]--> 如何查看实时jvm内存大小占用 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14763.html" class="sidebar-item" aria-label="利用Arthas排查NoSuchMethodError"><!--[--><!--]--> 利用Arthas排查NoSuchMethodError <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15728.html" class="sidebar-item" aria-label="arthas 获取成员变量"><!--[--><!--]--> arthas 获取成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11454.html" class="sidebar-item" aria-label="arthas 常用命令介绍"><!--[--><!--]--> arthas 常用命令介绍 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12453.html" class="sidebar-item" aria-label="arthas 怎么查看内存情况？"><!--[--><!--]--> arthas 怎么查看内存情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13506.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14831.html" class="sidebar-item" aria-label="Dashboard 命令cpuUsage长期在90%左右"><!--[--><!--]--> Dashboard 命令cpuUsage长期在90%左右 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15729.html" class="sidebar-item" aria-label="arthas 怎么查看变量内容"><!--[--><!--]--> arthas 怎么查看变量内容 <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例"><!--[--><!--]--><span>用户案例</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas" rel="noopener noreferrer" target="_blank" aria-label="Star me at github"><!--[--><!--]--><span>Star me at github</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" rel="noopener noreferrer" target="_blank" aria-label="编译调试/参与贡献"><!--[--><!--]--><span>编译调试/参与贡献</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes"><!--[--><!--]--><span>Release Notes</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ 群/钉钉群"><!--[--><!--]--> QQ 群/钉钉群 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>目录</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="tt" tabindex="-1"><a class="header-anchor" href="#tt" aria-hidden="true">#</a> tt</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-tt" target="_blank" rel="noopener noreferrer"><code>tt</code>在线教程<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>方法执行数据的时空隧道，记录下指定方法每次调用的入参和返回信息，并能对这些不同的时间下调用进行观测</p></div><p><code>watch</code> 虽然很方便和灵活，但需要提前想清楚观察表达式的拼写，这对排查问题而言要求太高，因为很多时候我们并不清楚问题出自于何方，只能靠蛛丝马迹进行猜测。</p><p>这个时候如果能记录下当时方法调用的所有入参和返回值、抛出的异常会对整个问题的思考与判断非常有帮助。</p><p>于是乎，TimeTunnel 命令就诞生了。</p><h2 id="注意事项" tabindex="-1"><a class="header-anchor" href="#注意事项" aria-hidden="true">#</a> 注意事项</h2><ul><li>tt 命令的实现是：把函数的入参/返回值等，保存到一个<code>Map<Integer, TimeFragment></code>里，默认的大小是 100。</li><li>tt 相关功能在使用完之后，需要手动释放内存，否则长时间可能导致OOM。退出 arthas 不会自动清除 tt 的缓存 map。</li></ul><h2 id="使用参考" tabindex="-1"><a class="header-anchor" href="#使用参考" aria-hidden="true">#</a> 使用参考</h2><h3 id="启动-demo" tabindex="-1"><a class="header-anchor" href="#启动-demo" aria-hidden="true">#</a> 启动 Demo</h3><p>启动<a href="/doc/quick-start.html" class="">快速入门</a>里的<code>math-game</code>。</p><h3 id="记录调用" tabindex="-1"><a class="header-anchor" href="#记录调用" aria-hidden="true">#</a> 记录调用</h3><p>对于一个最基本的使用来说，就是记录下当前方法的每次调用环境现场。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-t</span> demo.MathGame primeFactors
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">66</span> ms.
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:38 <span class="token number">1.096236</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1001</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:39 <span class="token number">0.191848</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1002</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:40 <span class="token number">0.069523</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1003</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:41 <span class="token number">0.186073</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1004</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:42 <span class="token number">17.76437</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x4b67cf4d MathGame primeFactors
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="指定-class-最大匹配数量" tabindex="-1"><a class="header-anchor" href="#指定-class-最大匹配数量" aria-hidden="true">#</a> 指定 Class 最大匹配数量</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-t</span> <span class="token parameter variable">-m</span> <span class="token number">1</span> demo.MathGame primeFactors
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Press Q or Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class count:1 , method count:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">130</span> ms, listenerId: <span class="token number">1</span>.
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2022</span>-12-25 <span class="token number">19</span>:41:45 <span class="token number">2.629929</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x3bf400 MathGame primeFactors
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<span class="token number">1001</span> <span class="token number">2022</span>-12-25 <span class="token number">19</span>:41:55 <span class="token number">0.146161</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x3bf400 MathGame primeFactors
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li><p>命令参数解析</p><ul><li><p><code>-t</code></p><p>tt 命令有很多个主参数，<code>-t</code> 就是其中之一。这个参数的表明希望记录下类 <code>*Test</code> 的 <code>print</code> 方法的每次执行情况。</p></li><li><p><code>-n 3</code></p><p>当你执行一个调用量不高的方法时可能你还能有足够的时间用 <code>CTRL+C</code> 中断 tt 命令记录的过程，但如果遇到调用量非常大的方法，瞬间就能将你的 JVM 内存撑爆。</p><p>此时你可以通过 <code>-n</code> 参数指定你需要记录的次数，当达到记录次数时 Arthas 会主动中断 tt 命令的记录过程，避免人工操作无法停止的情况。</p></li><li><p><code>-m 1</code></p><p>通过 <code>-m</code> 参数指定 Class 匹配的最大数量，防止匹配到的 Class 数量太多导致 JVM 挂起，默认值是 50。</p></li></ul></li><li><p>表格字段说明</p></li></ul><table><thead><tr><th>表格字段</th><th>字段解释</th></tr></thead><tbody><tr><td>INDEX</td><td>时间片段记录编号，每一个编号代表着一次调用，后续 tt 还有很多命令都是基于此编号指定记录操作，非常重要。</td></tr><tr><td>TIMESTAMP</td><td>方法执行的本机时间，记录了这个时间片段所发生的本机时间</td></tr><tr><td>COST(ms)</td><td>方法执行的耗时</td></tr><tr><td>IS-RET</td><td>方法是否以正常返回的形式结束</td></tr><tr><td>IS-EXP</td><td>方法是否以抛异常的形式结束</td></tr><tr><td>OBJECT</td><td>执行对象的<code>hashCode()</code>，注意，曾经有人误认为是对象在 JVM 中的内存地址，但很遗憾他不是。但他能帮助你简单的标记当前执行方法的类实体</td></tr><tr><td>CLASS</td><td>执行的类名</td></tr><tr><td>METHOD</td><td>执行的方法名</td></tr></tbody></table><ul><li><p>条件表达式</p><p>不知道大家是否有在使用过程中遇到以下困惑</p><ul><li>Arthas 似乎很难区分出重载的方法</li><li>我只需要观察特定参数，但是 tt 却全部都给我记录了下来</li></ul><p>条件表达式也是用 <code>OGNL</code> 来编写，核心的判断对象依然是 <code>Advice</code> 对象。除了 <code>tt</code> 命令之外，<code>watch</code>、<code>trace</code>、<code>stack</code> 命令也都支持条件表达式。</p></li><li><p>解决方法重载</p><p><code>tt -t *Test print params.length==1</code></p><p>通过制定参数个数的形式解决不同的方法签名，如果参数个数一样，你还可以这样写</p><p><code>tt -t *Test print 'params[1] instanceof Integer'</code></p></li><li><p>解决指定参数</p><p><code>tt -t *Test print params[0].mobile=="13989838402"</code></p></li><li><p>构成条件表达式的 <code>Advice</code> 对象</p><p>前边看到了很多条件表达式中，都使用了 <code>params[0]</code>，有关这个变量的介绍，请参考<a href="/doc/advice-class.html" class="">表达式核心变量</a></p></li></ul><h3 id="检索调用记录" tabindex="-1"><a class="header-anchor" href="#检索调用记录" aria-hidden="true">#</a> 检索调用记录</h3><p>当你用 <code>tt</code> 记录了一大片的时间片段之后，你希望能从中筛选出自己需要的时间片段，这个时候你就需要对现有记录进行检索。</p><p>假设我们有这些记录</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-l</span>
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:38 <span class="token number">1.096236</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1001</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:39 <span class="token number">0.191848</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1002</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:40 <span class="token number">0.069523</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1003</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:41 <span class="token number">0.186073</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1004</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:42 <span class="token number">17.76437</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">9</span>
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<span class="token number">1005</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:43 <span class="token number">0.4776</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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Affect<span class="token punctuation">(</span>row-cnt:6<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">4</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>我需要筛选出 <code>primeFactors</code> 方法的调用信息</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-s</span> <span class="token string">'method.name=="primeFactors"'</span>
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:38 <span class="token number">1.096236</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1001</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:39 <span class="token number">0.191848</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1002</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:40 <span class="token number">0.069523</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1003</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:41 <span class="token number">0.186073</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">1004</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:42 <span class="token number">17.76437</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x4b67cf4d MathGame primeFactors
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<span class="token number">9</span>
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<span class="token number">1005</span> <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:43 <span class="token number">0.4776</span> <span class="token boolean">false</span> <span class="token boolean">true</span> 0x4b67cf4d MathGame primeFactors
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Affect<span class="token punctuation">(</span>row-cnt:6<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">607</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>你需要一个 <code>-s</code> 参数。<span style="color:red;">同样的，搜索表达式的核心对象依旧是 <code>Advice</code> 对象。</span></p><h3 id="查看调用信息" tabindex="-1"><a class="header-anchor" href="#查看调用信息" aria-hidden="true">#</a> 查看调用信息</h3><p>对于具体一个时间片的信息而言，你可以通过 <code>-i</code> 参数后边跟着对应的 <code>INDEX</code> 编号查看到他的详细信息。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-i</span> <span class="token number">1003</span>
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INDEX <span class="token number">1003</span>
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GMT-CREATE <span class="token number">2018</span>-12-04 <span class="token number">11</span>:15:41
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COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> <span class="token number">0.186073</span>
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OBJECT 0x4b67cf4d
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CLASS demo.MathGame
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METHOD primeFactors
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IS-RETURN <span class="token boolean">false</span>
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IS-EXCEPTION <span class="token boolean">true</span>
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PARAMETERS<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> @Integer<span class="token punctuation">[</span>-564322413<span class="token punctuation">]</span>
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THROW-EXCEPTION java.lang.IllegalArgumentException: number is: -564322413, need <span class="token operator">>=</span> <span class="token number">2</span>
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at demo.MathGame.primeFactors<span class="token punctuation">(</span>MathGame.java:46<span class="token punctuation">)</span>
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at demo.MathGame.run<span class="token punctuation">(</span>MathGame.java:24<span class="token punctuation">)</span>
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at demo.MathGame.main<span class="token punctuation">(</span>MathGame.java:16<span class="token punctuation">)</span>
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Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">11</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="重做一次调用" tabindex="-1"><a class="header-anchor" href="#重做一次调用" aria-hidden="true">#</a> 重做一次调用</h3><p>当你稍稍做了一些调整之后，你可能需要前端系统重新触发一次你的调用，此时得求爷爷告奶奶的需要前端配合联调的同学再次发起一次调用。而有些场景下，这个调用不是这么好触发的。</p><p><code>tt</code> 命令由于保存了当时调用的所有现场信息，所以我们可以自己主动对一个 <code>INDEX</code> 编号的时间片自主发起一次调用，从而解放你的沟通成本。此时你需要 <code>-p</code> 参数。通过 <code>--replay-times</code> 指定 调用次数，通过 <code>--replay-interval</code> 指定多次调用间隔(单位 ms, 默认 1000ms)</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ tt <span class="token parameter variable">-i</span> <span class="token number">1004</span> <span class="token parameter variable">-p</span>
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RE-INDEX <span class="token number">1004</span>
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GMT-REPLAY <span class="token number">2018</span>-12-04 <span class="token number">11</span>:26:00
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OBJECT 0x4b67cf4d
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CLASS demo.MathGame
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METHOD primeFactors
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PARAMETERS<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> @Integer<span class="token punctuation">[</span><span class="token number">946738738</span><span class="token punctuation">]</span>
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IS-RETURN <span class="token boolean">true</span>
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IS-EXCEPTION <span class="token boolean">false</span>
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COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> <span class="token number">0.186073</span>
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RETURN-OBJ @ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">17</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2531387</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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Time fragment<span class="token punctuation">[</span><span class="token number">1004</span><span class="token punctuation">]</span> successfully replayed.
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Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">14</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>你会发现结果虽然一样，但调用的路径发生了变化，由原来的程序发起变成了 Arthas 自己的内部线程发起的调用了。</p><h3 id="观察表达式" tabindex="-1"><a class="header-anchor" href="#观察表达式" aria-hidden="true">#</a> 观察表达式</h3><p><code>-w, --watch-express</code> 观察时空隧道使用<code>ognl</code> 表达式</p><ul><li>使用<a href="/doc/advice-class.html" class="">表达式核心变量</a>中所有变量作为已知条件编写表达式。</li></ul><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@10718<span class="token punctuation">]</span>$ tt <span class="token parameter variable">-t</span> demo.MathGame run <span class="token parameter variable">-n</span> <span class="token number">5</span>
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Press Q or Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class count: <span class="token number">1</span> , method count: <span class="token number">1</span><span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">56</span> ms, listenerId: <span class="token number">1</span>
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2021</span>-01-08 <span class="token number">21</span>:54:17 <span class="token number">0.901091</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x7699a589 MathGame run
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<span class="token punctuation">[</span>arthas@10718<span class="token punctuation">]</span>$ tt <span class="token parameter variable">-w</span> <span class="token string">'target.illegalArgumentCount'</span> <span class="token parameter variable">-x</span> <span class="token number">1</span> <span class="token parameter variable">-i</span> <span class="token number">1000</span>
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@Integer<span class="token punctuation">[</span><span class="token number">60</span><span class="token punctuation">]</span>
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Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">7</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>获取类的静态字段、调用类的静态方法</li></ul><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@10718<span class="token punctuation">]</span>$ tt <span class="token parameter variable">-t</span> demo.MathGame run <span class="token parameter variable">-n</span> <span class="token number">5</span>
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Press Q or Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class count: <span class="token number">1</span> , method count: <span class="token number">1</span><span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">56</span> ms, listenerId: <span class="token number">1</span>
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INDEX TIMESTAMP COST<span class="token punctuation">(</span>ms<span class="token punctuation">)</span> IS-RET IS-EXP OBJECT CLASS METHOD
|
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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<span class="token number">1000</span> <span class="token number">2021</span>-01-08 <span class="token number">21</span>:54:17 <span class="token number">0.901091</span> <span class="token boolean">true</span> <span class="token boolean">false</span> 0x7699a589 MathGame run
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<span class="token punctuation">[</span>arthas@10718<span class="token punctuation">]</span>$ tt <span class="token parameter variable">-w</span> <span class="token string">'@demo.MathGame@random.nextInt(100)'</span> <span class="token parameter variable">-x</span> <span class="token number">1</span> <span class="token parameter variable">-i</span> <span class="token number">1000</span>
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@Integer<span class="token punctuation">[</span><span class="token number">46</span><span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>注意这里使用 <code>com.taobao.arthas.core.advisor.Advice#getLoader</code>加载,使用精确<code>classloader</code> <a href="/doc/ognl.html" class="">ognl</a>更好。</p><p>高级用法 <a href="https://github.com/alibaba/arthas/issues/482" target="_blank" rel="noopener noreferrer">获取 spring context 调用 bean 方法<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><ul><li><p>需要强调的点</p><ol><li><p><strong>ThreadLocal 信息丢失</strong></p><p>很多框架偷偷的将一些环境变量信息塞到了发起调用线程的 ThreadLocal 中，由于调用线程发生了变化，这些 ThreadLocal 线程信息无法通过 Arthas 保存，所以这些信息将会丢失。</p><p>一些常见的 CASE 比如：鹰眼的 TraceId 等。</p></li><li><p><strong>引用的对象</strong></p><p>需要强调的是，<code>tt</code> 命令是将当前环境的对象引用保存起来，但仅仅也只能保存一个引用而已。如果方法内部对入参进行了变更，或者返回的对象经过了后续的处理，那么在 <code>tt</code> 查看的时候将无法看到当时最准确的值。这也是为什么 <code>watch</code> 命令存在的意义。</p></li></ol></li></ul><h3 id="通过索引删除指定的-tt-记录" tabindex="-1"><a class="header-anchor" href="#通过索引删除指定的-tt-记录" aria-hidden="true">#</a> 通过索引删除指定的 tt 记录</h3><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>tt -d 1001
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="清除所有的-tt-记录" tabindex="-1"><a class="header-anchor" href="#清除所有的-tt-记录" aria-hidden="true">#</a> 清除所有的 tt 记录</h3><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>tt --delete-all
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