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<div id="app"><!--[--><div class="theme-container"><!--[--><header class="navbar"><div class="toggle-sidebar-button" title="切换侧边栏" aria-expanded="false" role="button" tabindex="0"><div class="icon" aria-hidden="true"><span></span><span></span><span></span></div></div><span><a href="/" class="" data-v-a8869d06><!----><span class="site-name can-hide" data-v-a8869d06>arthas</span><span class="navbar-version" data-v-a8869d06>v3.7.1</span></a></span><div class="navbar-items-wrapper" style=""><!--[--><!--]--><nav class="navbar-items can-hide"><!--[--><div class="navbar-item"><a href="/" class="" aria-label="首页"><!--[--><!--]--> 首页 <!--[--><!--]--></a></div><div class="navbar-item"><a class="external-link" href="/doc/arthas-tutorials.html?language=cn&id=arthas-basics" rel="noopener noreferrer" target="_blank" aria-label="在线教程"><!--[--><!--]--><span>在线教程</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="navbar-item"><a href="/doc/" class="router-link-active" aria-label="文档"><!--[--><!--]--> 文档 <!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/commands.md" class="" aria-label="命令列表"><!--[--><!--]--> 命令列表 <!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/download.md" class="" aria-label="下载"><!--[--><!--]--> 下载 <!--[--><!--]--></a></div><div class="navbar-item"><div class="navbar-dropdown-wrapper"><button class="navbar-dropdown-title" type="button" aria-label="Select language"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1em" height="1em" style="height:1.25rem;width:1.25rem;vertical-align:bottom;" viewbox="0 0 24 24"><path fill="currentColor" d="M13.35 22q-.6 0-.862-.387q-.263-.388-.063-.963l3.65-9.675q.15-.4.563-.688Q17.05 10 17.5 10q.425 0 .85.287q.425.288.575.688l3.65 9.675q.2.575-.062.963q-.263.387-.888.387q-.275 0-.5-.175q-.225-.175-.325-.425l-.85-2.45H15.1l-.875 2.45q-.1.25-.35.425q-.25.175-.525.175Zm2.35-4.8h3.6l-1.75-4.95h-.1ZM7.15 8.55q.4.725.85 1.337q.45.613 1.05 1.263q1.1-1.2 1.825-2.462Q11.6 7.425 12.1 6H2q-.425 0-.712-.287Q1 5.425 1 5t.288-.713Q1.575 4 2 4h6V3q0-.425.288-.713Q8.575 2 9 2t.713.287Q10 2.575 10 3v1h6q.425 0 .712.287Q17 4.575 17 5t-.288.713Q16.425 6 16 6h-1.9q-.525 1.775-1.425 3.45q-.9 1.675-2.225 3.15l2.4 2.45l-.75 2.05L9 14l-4.3 4.3q-.275.275-.7.275q-.425 0-.7-.275q-.275-.275-.275-.7q0-.425.275-.7l4.35-4.35q-.675-.775-1.25-1.563q-.575-.787-1.025-1.662Q5.1 8.8 5.35 8.4t.875-.4q.25 0 .525.162q.275.163.4.388Z"></path></svg><span class="arrow down"></span></button><button class="navbar-dropdown-title-mobile" type="button" aria-label="Select language"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1em" height="1em" style="height:1.25rem;width:1.25rem;vertical-align:bottom;" viewbox="0 0 24 24"><path fill="currentColor" d="M13.35 22q-.6 0-.862-.387q-.263-.388-.063-.963l3.65-9.675q.15-.4.563-.688Q17.05 10 17.5 10q.425 0 .85.287q.425.288.575.688l3.65 9.675q.2.575-.062.963q-.263.387-.888.387q-.275 0-.5-.175q-.225-.175-.325-.425l-.85-2.45H15.1l-.875 2.45q-.1.25-.35.425q-.25.175-.525.175Zm2.35-4.8h3.6l-1.75-4.95h-.1ZM7.15 8.55q.4.725.85 1.337q.45.613 1.05 1.263q1.1-1.2 1.825-2.462Q11.6 7.425 12.1 6H2q-.425 0-.712-.287Q1 5.425 1 5t.288-.713Q1.575 4 2 4h6V3q0-.425.288-.713Q8.575 2 9 2t.713.287Q10 2.575 10 3v1h6q.425 0 .712.287Q17 4.575 17 5t-.288.713Q16.425 6 16 6h-1.9q-.525 1.775-1.425 3.45q-.9 1.675-2.225 3.15l2.4 2.45l-.75 2.05L9 14l-4.3 4.3q-.275.275-.7.275q-.425 0-.7-.275q-.275-.275-.275-.7q0-.42
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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
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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
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78 com.taobao.config.client.timer main 5 TIMED_WAITING 22 0:0 false true
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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
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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
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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
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27 qos-boss-1-1 main 5 RUNNABLE 2 0:0 false true
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22 EagleEye-AsyncAppender-Thread-BizLog main 5 TIMED_WAITING 1 0:0 false 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></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-fdd717e0><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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