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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>v3.7.2</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&amp;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"><a href="/doc/expert/intro.md" class="" aria-label="专家答疑"><!--[--><!--]--> 专家答疑 <!--[--><!--]--></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
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>这时命令在后台执行,可以在 console 中继续执行其他命令。</p><h2 id="_2-通过-jobs-查看任务" tabindex="-1"><a class="header-anchor" href="#_2-通过-jobs-查看任务" aria-hidden="true">#</a> 2. 通过 jobs 查看任务</h2><p>如果希望查看当前有哪些 arthas 任务在执行,可以执行 jobs 命令,执行结果如下</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">jobs</span>
<span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">]</span>*
3 years ago
Stopped <span class="token function">watch</span> com.taobao.container.Test <span class="token builtin class-name">test</span> <span class="token string">&quot;params[0].{? #this.name == null }&quot;</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
execution count <span class="token builtin class-name">:</span> <span class="token number">19</span>
start <span class="token function">time</span> <span class="token builtin class-name">:</span> Fri Sep <span class="token number">22</span> 09:59:55 CST <span class="token number">2017</span>
<span class="token function">timeout</span> <span class="token function">date</span> <span class="token builtin class-name">:</span> Sat Sep <span class="token number">23</span> 09:59:55 CST <span class="token number">2017</span>
session <span class="token builtin class-name">:</span> 3648e874-5e69-473f-9eed-7f89660b079b <span class="token punctuation">(</span>current<span class="token punctuation">)</span>
</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><p>可以看到目前有一个后台任务在执行。</p><ul><li>job id 是 10, <code>*</code> 表示此 job 是当前 session 创建</li><li>状态是 Stopped</li><li>execution count 是执行次数,从启动开始已经执行了 19 次</li><li>timeout date 是超时的时间,到这个时间,任务将会自动超时退出</li></ul><h2 id="_3-任务暂停和取消" tabindex="-1"><a class="header-anchor" href="#_3-任务暂停和取消" aria-hidden="true">#</a> 3. 任务暂停和取消</h2><p>当任务正在前台执行,比如直接调用命令<code>trace Test t</code>或者调用后台执行命令<code>trace Test t &amp;</code>后又通过<code>fg</code>命令将任务转到前台。这时 console 中无法继续执行命令,但是可以接收并处理以下事件:</p><ul><li>ctrl + z将任务暂停。通过<code>jobs</code>查看任务状态将会变为 Stopped通过<code>bg &lt;job-id&gt;</code>或者<code>fg &lt;job-id&gt;</code>可让任务重新开始执行</li><li>ctrl + c停止任务</li><li>ctrl + d按照 linux 语义应当是退出终端,目前 arthas 中是空实现,不处理</li></ul><h2 id="_4-fg、bg-命令-将命令转到前台、后台继续执行" tabindex="-1"><a class="header-anchor" href="#_4-fg、bg-命令-将命令转到前台、后台继续执行" aria-hidden="true">#</a> 4. fg、bg 命令,将命令转到前台、后台继续执行</h2><ul><li>任务在后台执行或者暂停状态(<code>ctrl + z</code>暂停任务)时,执行<code>fg &lt;job-id&gt;</code>将可以把对应的任务转到前台继续执行。在前台执行时,无法在 console 中执行其他命令</li><li>当任务处于暂停状态时(<code>ctrl + z</code>暂停任务),执行<code>bg &lt;job-id&gt;</code>将可以把对应的任务在后台继续执行</li><li>非当前 session 创建的 job只能由当前 session fg 到前台执行</li></ul><h2 id="_5-任务输出重定向" tabindex="-1"><a class="header-anchor" href="#_5-任务输出重定向" aria-hidden="true">#</a> 5. 任务输出重定向</h2><p>可通过<code>&gt;</code>或者<code>&gt;&gt;</code>将任务输出结果输出到指定的文件中,可以和<code>&amp;</code>一起使用,实现 arthas 命令的后台异步任务。比如:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ trace Test t <span class="token operator">&gt;&gt;</span> test.out <span class="token operator">&amp;</span>
2 years ago
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>这时 trace 命令会在后台执行,并且把结果输出到应用<code>工作目录</code>下面的<code>test.out</code>文件。可继续执行其他命令。并可查看文件中的命令执行结果。可以执行<code>pwd</code>命令查看当前应用的<code>工作目录</code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">cat</span> test.out
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>如果没有指定重定向文件,则会把结果输出到<code>~/logs/arthas-cache/</code>目录下,比如:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ trace Test t <span class="token operator">&gt;&gt;</span> <span class="token operator">&amp;</span>
job <span class="token function">id</span> <span class="token builtin class-name">:</span> <span class="token number">2</span>
2 years ago
cache location <span class="token builtin class-name">:</span> /Users/admin/logs/arthas-cache/28198/2
</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></div><p>此时命令会在后台异步执行,并将结果异步保存在文件(<code>~/logs/arthas-cache/${PID}/${JobId}</code>)中;</p><ul><li>此时任务的执行不受 session 断开的影响;任务默认超时时间是 1 天,可以通过全局 <code>options</code> 命令修改默认超时时间;</li><li>此命令的结果将异步输出到  文件中;此时不管 <code>save-result</code> 是否为 true都不会再往<code>~/logs/arthas-cache/result.log</code> 中异步写结果。</li></ul><h2 id="_6-停止命令" tabindex="-1"><a class="header-anchor" href="#_6-停止命令" aria-hidden="true">#</a> 6. 停止命令</h2><p>异步执行的命令,如果希望停止,可执行<code>kill &lt;job-id&gt;</code></p><h2 id="_7-其他" tabindex="-1"><a class="header-anchor" href="#_7-其他" aria-hidden="true">#</a> 7. 其他</h2><ul><li>最多同时支持 8 个命令使用重定向将结果写日志</li><li>请勿同时开启过多的后台异步命令,以免对目标 JVM 性能造成影响</li><li>如果不想停止 arthas继续执行后台任务可以执行 <code>quit</code> 退出 arthas 控制台(<code>stop</code> 会停止 arthas 服务)</li></ul></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/async.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 class="contributor" title="email: qq892525597qq@163.com">Church</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 983433479@qq.com">汪吉</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><!----><span class="next"><a href="/doc/save-log.html" class="" aria-label="执行结果存日志"><!--[--><!--]--> 执行结果存日志 <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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