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<link rel="icon" href="/images/favicon.ico"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta property="og:title" content="Arthas"><meta property="og:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image" content="/images/arthas_mate_image.png"><meta property="og:description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="600"><meta property="twitter:image:src" content="/images/arthas_mate_image.png"><meta property="twitter:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta itemprop="name" content="Arthas"><meta itemprop="image" content="/images/arthas_mate_image.png"><meta itemprop="description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><script>
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aria-label="批处理功能"><!--[--><!--]--> 批处理功能 <!--[--><!--]--></a><!----></li><li><p tabindex="0" class="sidebar-item">ognl 表达式用法 <!----></p><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues/11" rel="noopener noreferrer" target="_blank" aria-label="活用ognl表达式"><!--[--><!--]--><span>活用ognl表达式</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" 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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-e0e60120><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-e0e60120><!--[--><!--]--><div class="right-menu-wrapper" data-v-e0e60120><div class="right-menu-margin"><div class="right-menu-title">目录</div><div class="right-menu-content"><!--[--><!--]--></div></div></div><div data-v-e0e60120><h3 id="arthas3-0-的新特性" tabindex="-1"><a class="header-anchor" href="#arthas3-0-的新特性" aria-hidden="true">#</a> Arthas3.0 的新特性</h3><h4 id="在线诊断功能" tabindex="-1"><a class="header-anchor" href="#在线诊断功能" aria-hidden="true">#</a> 在线诊断功能</h4><p>Arthas3.0 中最重要的特性，不需要登陆机器就可以对应用进行诊断，体验和本地诊断完全一致</p><h5 id="使用步骤" tabindex="-1"><a class="header-anchor" href="#使用步骤" aria-hidden="true">#</a> 使用步骤</h5><p>TODO</p><h5 id="动图演示" tabindex="-1"><a class="header-anchor" href="#动图演示" aria-hidden="true">#</a> 动图演示</h5><p>TODO</p><h4 id="管道支持" tabindex="-1"><a class="header-anchor" href="#管道支持" aria-hidden="true">#</a> 管道支持</h4><p>Arthas 3.0 开始支持管道, 率先提供了<code>grep</code>,<code>wc</code>,<code>plaintext</code>的支持。</p><h3 id="去-groovy-依赖" tabindex="-1"><a class="header-anchor" href="#去-groovy-依赖" aria-hidden="true">#</a> 去 groovy 依赖</h3><p>groovy 表达式在 arthas2.0 中大量使用，例如 watch 表达式</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> com.alibaba.sample.petstore.web.store.module.screen.ItemList <span class="token function">add</span> <span class="token string">"params + ' ' + returnObj"</span> params.size<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">==</span><span class="token number">2</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>其中<code>"params + ' ' + returnObj"</code>以及<code>params.size()==2</code>背后其实都使用了 groovy 来进行表达式求值，如果反复大量的运行这些表达式，groovy 会创建大量的 classloader，打满 perm 区从而触发 FGC。</p><p>为了避免这个问题，Arthas 3.0 中使用了 ognl 这个更加轻量的表达式求值库来代替 groovy，彻底解决了 groovy 引起的 FGC 风险。但由于这个替换，导致原来使用 groovy 脚本编写的自定义脚本失效。这个问题留待后续解决。</p><p>在 3.0 中，watch 命令的表达式部分的书写有了一些改变，详见<a href="https://arthas.aliyun.com/doc/watch" target="_blank" rel="noopener noreferrer">这里<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><h4 id="提升-rt-统计精度" tabindex="-1"><a class="header-anchor" href="#提升-rt-统计精度" aria-hidden="true">#</a> 提升 rt 统计精度</h4><p>Arthas 2.0 中，统计 rt 都是以<code>ms</code>为单位，对于某些比较小的方法调用，耗时在毫秒以下的都会被认为是 0ms，造成 trace 总时间和各方法的时间相加不一致等问题（虽然这里面确实会有误差，主要 Arthas 自身的开销）。Arthas 3.0 中所有 rt 的单位统一改为使用<code>ns</code>来统计，精准捕获你的方法耗时，让 0ms 这样无意义的统计数据不再出现！</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ tt -l
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INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
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------------------------------------------------------------------------------------------------------------------------------------------------------------
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1000 2017-02-24 10:56:46 808.743525 true false 0x3bd5e918 TestTraceServlet doGet
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1001 2017-02-24 10:56:55 805.799155 true false 0x3bd5e918 TestTraceServlet doGet
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1002 2017-02-24 10:57:04 808.026935 true false 0x3bd5e918 TestTraceServlet doGet
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1003 2017-02-24 10:57:22 805.036963 true false 0x3bd5e918 TestTraceServlet doGet
|
|
1004 2017-02-24 10:57:24 803.581886 true false 0x3bd5e918 TestTraceServlet doGet
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|
1005 2017-02-24 10:57:39 814.657657 true false 0x3bd5e918 TestTraceServlet doGet
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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><h4 id="watch-stack-trace-命令支持按耗时过滤" tabindex="-1"><a class="header-anchor" href="#watch-stack-trace-命令支持按耗时过滤" aria-hidden="true">#</a> watch/stack/trace 命令支持按耗时过滤</h4><p>我们在 trace 的时候，经常会出现某个方法间隙性的 rt 飙高，但是我们只想知道 rt 高的时候，是哪里慢了，对于正常 rt 的方法我们并不关心，Arthas 3.0 支持了按<code>#cost</code>(方法执行耗时,单位为<code>ms</code>)进行过滤，只输出符合条件的 trace 路径，目前，这三个命令的相关文档已经做了更新，增加了该用法的示例。</p><h4 id="sysprop-命令操作-systemproperty" tabindex="-1"><a class="header-anchor" href="#sysprop-命令操作-systemproperty" aria-hidden="true">#</a> sysprop 命令操作 SystemProperty</h4><p>sysprop 命令支持查看所有的系统属性，以及针对特定属性进行查看和修改。</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ sysprop
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...
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os.arch x86_64
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java.ext.dirs /Users/wangtao/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.
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8.0_51.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library
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/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
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user.dir /Users/wangtao/work/ali-tomcat-home/ant-develop/output/build
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catalina.vendor alibaba
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line.separator
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java.vm.name Java HotSpot(TM) 64-Bit Server VM
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file.encoding UTF-8
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org.apache.tomcat.util.http.ServerCookie.ALLOW_EQUA true
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LS_IN_VALUE
|
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com.taobao.tomcat.info Apache Tomcat/7.0.70.1548
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java.specification.version 1.8
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$ sysprop java.version
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java.version=1.8.0_51
|
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$ sysprop production.mode true
|
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Successfully changed the system property.
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production.mode=true
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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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="thread-命令支持指定采样时间" tabindex="-1"><a class="header-anchor" href="#thread-命令支持指定采样时间" aria-hidden="true">#</a> thread 命令支持指定采样时间</h4><p>thread 命令计算线程 cpu 占用的逻辑，默认是采样 100ms 内各个线程的 cpu 使用情况并计算 cpu 消耗占比。有时候 100ms 的时间间隔太短，看不出问题所在，Arthas3.0 中 thread 命令支持设置采样间隔(以<code>ms</code>为单位)，可以观察任意时间段内的 cpu 消耗占比情况。</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ thread -i 1000
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Threads Total: 74, NEW: 0, RUNNABLE: 17, BLOCKED: 0, WAITING: 15, TIMED_WAITING: 42, TERMINATED: 0
|
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ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
|
|
78 com.taobao.config.client.timer main 5 TIMED_WAITING 22 0:0 false true
|
|
92 Abandoned connection cleanup thread main 5 TIMED_WAITING 15 0:2 false true
|
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361 as-command-execute-daemon system 10 RUNNABLE 14 0:0 false true
|
|
67 HSF-Remoting-Timer-10-thread-1 main 10 TIMED_WAITING 12 0:2 false true
|
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113 JamScheduleThread system 9 TIMED_WAITING 2 0:0 false true
|
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14 Thread-3 main 5 RUNNABLE 2 0:0 false false
|
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81 com.taobao.remoting.TimerThread main 5 TIMED_WAITING 2 0:0 false true
|
|
104 http-bio-7001-AsyncTimeout main 5 TIMED_WAITING 2 0:0 false true
|
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123 nioEventLoopGroup-2-1 system 10 RUNNABLE 2 0:0 false false
|
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127 nioEventLoopGroup-3-2 system 10 RUNNABLE 2 0:0 false false
|
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345 nioEventLoopGroup-3-3 system 10 RUNNABLE 2 0:0 false false
|
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358 nioEventLoopGroup-3-4 system 10 RUNNABLE 2 0:0 false false
|
|
27 qos-boss-1-1 main 5 RUNNABLE 2 0:0 false true
|
|
22 EagleEye-AsyncAppender-Thread-BizLog main 5 TIMED_WAITING 1 0:0 false true
|
|
</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></div><h4 id="trace-命令自动高亮显示最耗时方法调用" tabindex="-1"><a class="header-anchor" href="#trace-命令自动高亮显示最耗时方法调用" aria-hidden="true">#</a> trace 命令自动高亮显示最耗时方法调用</h4><p>trace 命令现在会自动显示</p><p></p></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-e0e60120><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/arthas3.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</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></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!----><!--]--><!--]--></span></div></footer><!----><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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