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<div class="section" id="arthas">
<h1>Arthas异步调用<a class="headerlink" href="#arthas" title="永久链接至标题">¶</a></h1>
<p>arthas中的异步调用，使用了仿linux系统任务相关的命令。<a class="reference external" 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/">linux任务相关介绍</a>。</p>
<div class="section" id="id1">
<h2>1. 使用&在后台执行任务<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></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="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">trace Test t & </pre></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>
</div>
<div class="section" id="jobs">
<h2>2. 通过jobs查看任务<a class="headerlink" href="#jobs" title="永久链接至标题">¶</a></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="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ jobs
[10]*
Stopped watch com.taobao.container.Test test "params[0].{? #this.name == null }" -x 2
execution count : 19
start time : Fri Sep 22 09:59:55 CST 2017
timeout date : Sat Sep 23 09:59:55 CST 2017
session : 3648e874-5e69-473f-9eed-7f89660b079b (current)</pre></div>
</div>
<p>可以看到目前有一个后台任务在执行。</p>
<ul class="simple">
<li><p>job id是10, <code class="docutils literal notranslate"><span class="pre">*</span></code> 表示此job是当前session创建</p></li>
<li><p>状态是Stopped</p></li>
<li><p>execution count是执行次数，从启动开始已经执行了19次</p></li>
<li><p>timeout date是超时的时间，到这个时间，任务将会自动超时退出</p></li>
</ul>
</div>
<div class="section" id="id2">
<h2>3. 任务暂停和取消<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
<p>当任务正在前台执行，比如直接调用命令<code class="docutils literal notranslate"><span class="pre">trace</span> <span class="pre">Test</span> <span class="pre">t</span></code>或者调用后台执行命令<code class="docutils literal notranslate"><span class="pre">trace</span> <span class="pre">Test</span> <span class="pre">t</span> <span class="pre">&</span></code>后又通过<code class="docutils literal notranslate"><span class="pre">fg</span></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 class="simple">
<li><p>‘ctrl + z’：将任务暂停。通过<code class="docutils literal notranslate"><span class="pre">jbos</span></code>查看任务状态将会变为Stopped，通过<code class="docutils literal notranslate"><span class="pre">bg</span> <span class="pre"><job-id></span></code>或者<code class="docutils literal notranslate"><span class="pre">fg</span> <span class="pre"><job-id></span></code>可让任务重新开始执行</p></li>
<li><p>‘ctrl + c’：停止任务</p></li>
<li><p>‘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</p></li>
</ul>
</div>
<div class="section" id="fgbg">
<h2>4. fg、bg命令，将命令转到前台、后台继续执行<a class="headerlink" href="#fgbg" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li><p>任务在后台执行或者暂停状态（<code class="docutils literal notranslate"><span class="pre">ctrl</span> <span class="pre">+</span> <span class="pre">z</span></code>暂停任务）时，执行<code class="docutils literal notranslate"><span class="pre">fg</span> <span class="pre"><job-id></span></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</p></li>
<li><p>当任务处于暂停状态时（<code class="docutils literal notranslate"><span class="pre">ctrl</span> <span class="pre">+</span> <span class="pre">z</span></code>暂停任务），执行<code class="docutils literal notranslate"><span class="pre">bg</span> <span class="pre"><job-id></span></code>将可以把对应的任务在后台继续执行</p></li>
<li><p>非当前session创建的job，只能由当前session fg到前台执行</p></li>
</ul>
</div>
<div class="section" id="id3">
<h2>5. 任务输出重定向<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
<p>可通过<code class="docutils literal notranslate"><span class="pre">></span></code>或者<code class="docutils literal notranslate"><span class="pre">>></span></code>将任务输出结果输出到指定的文件中，可以和<code class="docutils literal notranslate"><span class="pre">&</span></code>一起使用，实现arthas命令的异步调用。比如：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ trace Test t >> test.out &</pre></div>
</div>
<p>这时trace命令会在后台执行，并且把结果输出到~/logs/arthas-cache/test.out。可继续执行其他命令。并可查看文件中的命令执行结果。</p>
<p>当连接到远程的arthas server时，可能无法查看远程机器的文件，arthas同时支持了自动重定向到本地缓存路径。使用方法如下：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ trace Test t >> &
job id : 2
cache location : /Users/gehui/logs/arthas-cache/28198/2</pre></div>
</div>
<p>可以看到并没有指定重定向文件位置，arthas自动重定向到缓存中了，执行命令后会输出job id和cache location。cache location就是重定向文件的路径，在系统logs目录下，路径包括pid和job id，避免和其他任务冲突。命令输出结果到<code class="docutils literal notranslate"><span class="pre">/Users/gehui/logs/arthas-cache/28198/2</span></code>中，job id为2。</p>
</div>
<div class="section" id="id4">
<h2>6. 停止命令<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
<p>异步执行的命令，如果希望停止，可执行kill <job-id></p>
</div>
<div class="section" id="id5">
<h2>7. 其他<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li><p>最多同时支持8个命令使用重定向将结果写日志</p></li>
<li><p>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</p></li>
</ul>
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