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html, body {
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<script>
const userMode = localStorage.getItem('vuepress-color-scheme');
const systemDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
if (userMode === 'dark' || (userMode !== 'light' && systemDarkMode)) {
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<span class="right arrow"></span></p><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/doc/expert/intro.html" class="sidebar-item" aria-label="无疑 专家智能答疑 介绍"><!--[--><!--]--> 无疑 专家智能答疑 介绍 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11466.html" class="sidebar-item" aria-label="arthas 有没有在线教程？"><!--[--><!--]--> arthas 有没有在线教程？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12454.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-history13507.html" class="sidebar-item" aria-label="arthas查看内存占用大的地方"><!--[--><!--]--> arthas查看内存占用大的地方 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14832.html" class="sidebar-item" aria-label="arthas启动时内存溢出"><!--[--><!--]--> arthas启动时内存溢出 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15730.html" class="sidebar-item" aria-label="arthas 观察方法中的某个变量的值"><!--[--><!--]--> arthas 观察方法中的某个变量的值 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11440.html" class="sidebar-item" aria-label="arthas 怎么使用？"><!--[--><!--]--> arthas 怎么使用？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11467.html" class="sidebar-item" aria-label="arthas 在线教程在哪？"><!--[--><!--]--> arthas 在线教程在哪？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12455.html" class="sidebar-item" aria-label="arthas 排查内存泄露的具体方法"><!--[--><!--]--> arthas 排查内存泄露的具体方法 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13508.html" class="sidebar-item" aria-label="arthas 如何查看内存使用情况"><!--[--><!--]--> arthas 如何查看内存使用情况 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14833.html" class="sidebar-item" aria-label="Start arthas failed, exception stack trace:com.sun.tools.attach"><!--[--><!--]--> Start arthas failed, exception stack trace:com.sun.tools.attach <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15731.html" class="sidebar-item" aria-label="arthas 过滤方法的阐述"><!--[--><!--]--> arthas 过滤方法的阐述 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11442.html" class="sidebar-item" aria-label="arthas 介绍一下"><!--[--><!--]--> arthas 介绍一下 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11468.html" class="sidebar-item" aria-label="arthas 怎么使用？"><!--[--><!--]--> arthas 怎么使用？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12706.html" class="sidebar-item" aria-label="arthas 火焰图 怎么看？"><!--[--><!--]--> arthas 火焰图 怎么看？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13509.html" class="sidebar-item" aria-label="通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大"><!--[--><!--]--> 通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14834.html" class="sidebar-item" aria-label="使用arthas 跟踪进程服务后，进程所占用的文件描述符陡增，且文件描述符不下降"><!--[--><!--]--> 使用arthas 跟踪进程服务后，进程所占用的文件描述符陡增，且文件描述符不下降 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15735.html" class="sidebar-item" aria-label="arthas报错connect to telnet server error: 127.0.0.1 9999"><!--[--><!--]--> arthas报错connect to telnet server error: 127.0.0.1 9999 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11443.html" class="sidebar-item" aria-label="arthas 下载和安装"><!--[--><!--]--> arthas 下载和安装 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11469.html" class="sidebar-item" aria-label="linux的arthas使用教程"><!--[--><!--]--> linux的arthas使用教程 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12715.html" class="sidebar-item" aria-label="java 如何用arthas 查看 内存 情况？"><!--[--><!--]--> java 如何用arthas 查看 内存 情况？ 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href="/doc/expert/user-question-history12716.html" 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？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12740.html" class="sidebar-item" aria-label="arthas怎么分析cpu很高"><!--[--><!--]--> arthas怎么分析cpu很高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13512.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-history15167.html" class="sidebar-item" aria-label="介绍一下arthas"><!--[--><!--]--> 介绍一下arthas <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15738.html" class="sidebar-item" aria-label="arthas如何查看hashmap的值"><!--[--><!--]--> arthas如何查看hashmap的值 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11451.html" class="sidebar-item" aria-label="arthas 怎么排查cpu占用过高？"><!--[--><!--]--> arthas 怎么排查cpu占用过高？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11809.html" class="sidebar-item" 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 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11810.html" class="sidebar-item" aria-label="arthas查看方法耗时"><!--[--><!--]--> arthas查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13448.html" class="sidebar-item" aria-label="如何使用arthas分析慢查询"><!--[--><!--]--> 如何使用arthas分析慢查询 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13522.html" class="sidebar-item" aria-label="Connect to telnet server error: 127.0.0.1 3658"><!--[--><!--]--> Connect to telnet server error: 127.0.0.1 3658 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15726.html" class="sidebar-item" aria-label="arthas 如何查询static变量"><!--[--><!--]--> arthas 如何查询static变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15740.html" class="sidebar-item" aria-label="arthas 分析内存升高的方法"><!--[--><!--]--> arthas 分析内存升高的方法 <!--[--><!--]--></a><!----></li><li><a 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="arthas-后台异步任务" tabindex="-1"><a class="header-anchor" href="#arthas-后台异步任务" aria-hidden="true">#</a> Arthas 后台异步任务</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&amp;id=case-async-jobs" target="_blank" rel="noopener noreferrer"><code>后台异步任务</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><p>arthas 中的后台异步任务，使用了仿 linux 系统任务相关的命令。<a href="https://ehlxr.me/2017/01/18/Linux-%E4%B8%AD-fg%E3%80%81bg%E3%80%81jobs%E3%80%81-%E6%8C%87%E4%BB%A4/" target="_blank" rel="noopener noreferrer">linux 任务相关介绍<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><h2 id="_1-使用-在后台执行任务" tabindex="-1"><a class="header-anchor" href="#_1-使用-在后台执行任务" aria-hidden="true">#</a> 1. 使用&amp;在后台执行任务</h2><p>比如希望执行后台执行 trace 命令，那么调用下面命令</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>trace Test t <span class="token operator">&amp;</span>
</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>*
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>
</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>
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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