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3.0.6-SNAPSHOT
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<li><a href="../index.html">Docs</a> »</li>
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<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/arthas_3_0/new_feature.md" class="fa fa-github"> Edit on GitHub</a>
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<div class="section" id="arthas-3-0">
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<span id="arthas-3-0"></span><h1>Arthas 3.0新特性介绍<a class="headerlink" href="#arthas-3-0" title="永久链接至标题">¶</a></h1>
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<p>Arthas 3.0在架构上做了重大改造，通过引入<code class="docutils literal notranslate"><span class="pre">termd</span></code>完整的支持了telnet协议，并基于websocket封装了telnet协议实现了<code class="docutils literal notranslate"><span class="pre">Telnet</span> <span class="pre">over</span> <span class="pre">HTTP</span></code>，使得在线诊断成为了可能，并且保证了本地启动，telnet远程访问，在线诊断三种方式的体验完全一致。都支持自动补全，高亮显示等功能。并且支持<code class="docutils literal notranslate"><span class="pre">多人同时在线诊断</span></code>。</p>
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<div class="section" id="">
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<span id="id1"></span><h2>在线诊断<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<p>Arthas 3.0最重要的特性，通过Arthas在线诊断平台，无需再登陆目标机器，一键启动Arthas并开启诊断！</p>
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<p></p>
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<p>具体使用方法请参见<a class="reference external" href="https://github.com/alibaba/arthas/wiki/arthas_3_0/home">在线诊断使用说明</a></p>
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</div>
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<div class="section" id="">
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<span id="id2"></span><h2>管道支持<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<p>Arthas 3.0开始支持管道, 率先提供了<code class="docutils literal notranslate"><span class="pre">grep</span></code>,<code class="docutils literal notranslate"><span class="pre">wc</span></code>,<code class="docutils literal notranslate"><span class="pre">plaintext</span></code>的支持。</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> java.vendor.url http://java.oracle.com/
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java.vm.vendor Oracle Corporation
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java.runtime.name Java<span class="o">(</span>TM<span class="o">)</span> SE Runtime Environment
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sun.java.command org.apache.catalina.startup.Bootstrap start
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java.class.path /Users/wangtao/work/ali-tomcat-home/ant-develop/output/build/bin/bootstrap.jar
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java.vm.specification.name Java Virtual Machine Specification
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java.vm.specification.version <span class="m">1</span>.8
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java.awt.headless <span class="nb">true</span>
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java.io.tmpdir /Users/wangtao/work/ali-tomcat-home/ant-develop/output/build/temp
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java.vendor.url.bug http://bugreport.sun.com/bugreport/
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java.awt.graphicsenv sun.awt.CGraphicsEnvironment
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java.ext.dirs /Users/wangtao/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.
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/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
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java.vm.name Java HotSpot<span class="o">(</span>TM<span class="o">)</span> <span class="m">64</span>-Bit Server VM
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java.specification.version <span class="m">1</span>.8
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$ sysprop <span class="p">|</span> grep java <span class="p">|</span> wc -l
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<span class="m">36</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="">
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<span id="id3"></span><h2>启动自检<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<p>针对启动时经常出现的权限问题，在启动脚本中增加了自检逻辑，脚本会自动判断目标进程是否具备attach权限，并给出进一步的提示。</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>[huxing.zhx@v125056161.bja /home/huxing.zhx]
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$./as.sh 32260
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The current user (huxing.zhx) does not match with the owner of process 32260 (admin).
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To solve this, choose one of the following command:
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1) sudo su admin && ./as.sh
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2) sudo -u admin -EH ./as.sh
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</pre></div>
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</div>
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</div>
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<div class="section" id="groovy">
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<span id="groovy"></span><h2>去groovy依赖<a class="headerlink" href="#groovy" title="永久链接至标题">¶</a></h2>
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<p>groovy表达式在arthas2.0中大量使用，例如watch表达式</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"params + ' ' + returnObj"</span> params.size<span class="o">()==</span><span class="m">2</span>
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</pre></div>
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</div>
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<p>其中<code class="docutils literal notranslate"><span class="pre">"params</span> <span class="pre">+</span> <span class="pre">'</span> <span class="pre">'</span> <span class="pre">+</span> <span class="pre">returnObj"</span></code>以及<code class="docutils literal notranslate"><span class="pre">params.size()==2</span></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>
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<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>
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<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 class="reference external" href="https://alibaba.github.io/arthas/watch">这里</a></p>
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</div>
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<div class="section" id="rt">
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<span id="rt"></span><h2>提升rt统计精度<a class="headerlink" href="#rt" title="永久链接至标题">¶</a></h2>
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<p>Arthas 2.0中，统计rt都是以<code class="docutils literal notranslate"><span class="pre">ms</span></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 class="docutils literal notranslate"><span class="pre">ns</span></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>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ 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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</pre></div>
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</div>
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</div>
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<div class="section" id="watch-stack-trace">
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<span id="watch-stack-trace"></span><h2>watch/stack/trace命令支持按耗时过滤<a class="headerlink" href="#watch-stack-trace" title="永久链接至标题">¶</a></h2>
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<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 class="docutils literal notranslate"><span class="pre">#cost</span></code>(方法执行耗时,单位为<code class="docutils literal notranslate"><span class="pre">ms</span></code>)进行过滤，只输出符合条件的trace路径。</p>
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<p>具体用法为：</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">trace</span><span class="o">/</span><span class="n">watch</span><span class="o">/</span><span class="n">stack</span> <span class="n">class_name</span> <span class="n">method</span> <span class="n">cost_expression</span>
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</pre></div>
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</div>
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<p>例如：</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ trace test.arthas.TestTraceServlet doGet #cost>800
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 137 ms.
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trace test.arthas.TestTraceServlet doGet #cost>800
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`---thread_name=http-bio-8080-exec-9;id=6e;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.WebappClassLoader
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`---[816.880001ms] test.arthas.TestTraceServlet:doGet()
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+---[min=0.019223ms,max=1.192115ms,total=1.211338ms,count=2] java.lang.System:currentTimeMillis()
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+---[1.407006ms] test.arthas.TestTraceServlet:call1()
|
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|
+---[381.970892ms] test.arthas.TestTraceServlet:callhsfL1()
|
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|
+---[0.018866ms] test.arthas.TestPathTrace:<init>()
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|
+---[375.753301ms] test.arthas.TestPathTrace:callPathTrace()
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|
+---[12.352252ms] test.arthas.TestTraceServlet:call3()
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|
+---[2.758025ms] test.arthas.TestTraceServlet:call4()
|
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|
+---[1.246057ms] test.arthas.TestTraceServlet:call5()
|
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|
+---[10.306568ms] test.arthas.TestTraceServlet:call6()
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|
+---[8.891933ms] test.arthas.TestTraceServlet:call7()
|
|
|
+---[4.030325ms] test.arthas.TestTraceServlet:call8()
|
|
|
+---[6.51316ms] test.arthas.TestTraceServlet:call9()
|
|
|
+---[0.059405ms] javax.servlet.http.HttpServletResponse:getWriter()
|
|
|
+---[0.013107ms] java.lang.StringBuilder:<init>()
|
|
|
+---[min=0.004892ms,max=0.06357ms,total=0.100672ms,count=3] java.lang.StringBuilder:append()
|
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|
+---[0.018255ms] java.lang.StringBuilder:toString()
|
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|
`---[0.028812ms] java.io.PrintWriter:write()
|
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</pre></div>
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</div>
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|
<p>上述命令只有当<code class="docutils literal notranslate"><span class="pre">test.arthas.TestTraceServlet#doGet</span></code>方法执行耗时大于800ms时才会输出。</p>
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</div>
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<div class="section" id="trace">
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<span id="trace"></span><h2>trace命令优化<a class="headerlink" href="#trace" title="永久链接至标题">¶</a></h2>
|
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|
<div class="section" id="">
|
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|
<span id="id4"></span><h3>自动高亮显示最耗时方法调用<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
|
|
|
<p>trace命令现在会自动显示</p>
|
|
|
<p><img alt="image" src="arthas_3_0/TODO/image.png" /></p>
|
|
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</div>
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<div class="section" id="trace">
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<span id="id5"></span><h3>带条件过滤的多级trace<a class="headerlink" href="#trace" title="永久链接至标题">¶</a></h3>
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|
|
<p>目前trace默认只输出一级方法调用耗时，有时候并不能完全看出问题。但是如果展开多级的话，每一个方法的耗时都统计，会造成方法数量迅速膨胀，大大增加trace的开销。</p>
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|
|
<p>TODO</p>
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|
</div>
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<div class="section" id="eagleeyetraceid">
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|
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<span id="eagleeyetraceid"></span><h3>显示当前线程的信息及eagleeye的traceId<a class="headerlink" href="#eagleeyetraceid" title="永久链接至标题">¶</a></h3>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>trace test.arthas.TestTraceServlet doGet
|
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`---thread_name=http-bio-8080-exec-10;id=da;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.WebappClassLoader;trace_id=1e09489014879085429791006d969d
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</pre></div>
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</div>
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</div>
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</div>
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<div class="section" id="syspropsystemproperty">
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<span id="syspropsystemproperty"></span><h2>sysprop命令操作SystemProperty<a class="headerlink" href="#syspropsystemproperty" title="永久链接至标题">¶</a></h2>
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<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>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ 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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</pre></div>
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</div>
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</div>
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<div class="section" id="thread">
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<span id="thread"></span><h2>thread命令支持指定采样时间<a class="headerlink" href="#thread" title="永久链接至标题">¶</a></h2>
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|
|
<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 class="docutils literal notranslate"><span class="pre">ms</span></code>为单位)，可以观察任意时间段内的cpu消耗占比情况。</p>
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|
|
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ thread -i 1000
|
|
|
Threads Total: 74, NEW: 0, RUNNABLE: 17, BLOCKED: 0, WAITING: 15, TIMED_WAITING: 42, TERMINATED: 0
|
|
|
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
|
|
|
78 com.taobao.config.client.timer main 5 TIMED_WAITING 22 0:0 false true
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|
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92 Abandoned connection cleanup thread main 5 TIMED_WAITING 15 0:2 false true
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|
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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
|
|
|
113 JamScheduleThread system 9 TIMED_WAITING 2 0:0 false true
|
|
|
14 Thread-3 main 5 RUNNABLE 2 0:0 false false
|
|
|
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
|
|
|
123 nioEventLoopGroup-2-1 system 10 RUNNABLE 2 0:0 false false
|
|
|
127 nioEventLoopGroup-3-2 system 10 RUNNABLE 2 0:0 false false
|
|
|
345 nioEventLoopGroup-3-3 system 10 RUNNABLE 2 0:0 false false
|
|
|
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
|
|
|
</pre></div>
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