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<li class="toctree-l1 current"><a class="current reference internal" href="#">快速入门</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#demo">1. 启动Demo</a></li>
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<span id="id1"></span><h1>快速入门<a class="headerlink" href="#" title="永久链接至标题">¶</a></h1>
<div class="section" id="demo">
<span id="demo"></span><h2>1. 启动Demo<a class="headerlink" href="#demo" title="永久链接至标题">¶</a></h2>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">java.util.concurrent.TimeUnit</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">java.util.concurrent.atomic.AtomicInteger</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">Demo</span> <span class="o">{</span>
<span class="kd">static</span> <span class="kd">class</span> <span class="nc">Counter</span> <span class="o">{</span>
<span class="kd">private</span> <span class="kd">static</span> <span class="n">AtomicInteger</span> <span class="n">count</span> <span class="o">=</span> <span class="k">new</span> <span class="n">AtomicInteger</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span>
<span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">increment</span><span class="o">()</span> <span class="o">{</span>
<span class="n">count</span><span class="o">.</span><span class="na">incrementAndGet</span><span class="o">();</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kd">static</span> <span class="kt">int</span> <span class="nf">value</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">count</span><span class="o">.</span><span class="na">get</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">InterruptedException</span> <span class="o">{</span>
<span class="k">while</span> <span class="o">(</span><span class="kc">true</span><span class="o">)</span> <span class="o">{</span>
<span class="n">Counter</span><span class="o">.</span><span class="na">increment</span><span class="o">();</span>
<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"counter: "</span> <span class="o">+</span> <span class="n">Counter</span><span class="o">.</span><span class="na">value</span><span class="o">());</span>
<span class="n">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
</pre></div>
</div>
<p>把上面的内容保存到<code class="docutils literal notranslate"><span class="pre">Demo.java</span></code>里，然后在命令行下编绎启动：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>javac Demo.java
java Demo
</pre></div>
</div>
<p>也可以把代码保存到IDE里，然后启动。</p>
</div>
<div class="section" id="arthas">
<span id="arthas"></span><h2>2. 启动arthas<a class="headerlink" href="#arthas" title="永久链接至标题">¶</a></h2>
<div class="section" id="linux-unix-mac">
<span id="linux-unix-mac"></span><h3>Linux/Unix/Mac<a class="headerlink" href="#linux-unix-mac" title="永久链接至标题">¶</a></h3>
<p>在命令行下面执行：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>./as.sh
</pre></div>
</div>
<blockquote>
<div>执行该脚本的用户需要和目标进程具有相同的权限。比如以<code class="docutils literal notranslate"><span class="pre">admin</span></code>用户来执行：
<code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">su</span> <span class="pre">admin</span> <span class="pre">&&</span> <span class="pre">./as.sh</span></code> 或 <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">-u</span> <span class="pre">admin</span> <span class="pre">-EH</span> <span class="pre">./as.sh</span></code>。
详细的启动脚本说明，请参考<a class="reference internal" href="start-arthas.html"><span class="doc">这里</span></a>。
如果attatch不上目标进程，可以查看<code class="docutils literal notranslate"><span class="pre">~/logs/arthas/</span></code> 目录下的日志。</div></blockquote>
<p>选择应用java进程：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ ./as.sh
Arthas script version: 3.0.2
Found existing java process, please choose one and hit RETURN.
* [1]: 95428
[2]: 22647 org.jetbrains.jps.cmdline.Launcher
[3]: 21736
[4]: 13560 Demo
</pre></div>
</div>
<p>Demo进程是第4个，则输入4，再输入回车/enter。Arthas会attach到目标进程上，并输出日志：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>Connecting to arthas server... current timestamp is 1536656867
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\ \ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki: https://alibaba.github.io/arthas
version: 3.0.1-RC-SNAPSHOT
pid: 13560
timestamp: 1536656867894
</pre></div>
</div>
</div>
<div class="section" id="windows">
<span id="windows"></span><h3>Windows<a class="headerlink" href="#windows" title="永久链接至标题">¶</a></h3>
<p>打开Dos命令行窗口，在解压的arthas目录下执行<code class="docutils literal notranslate"><span class="pre">as.bat</span></code>。</p>
</div>
</div>
<div class="section" id="dashboard">
<span id="dashboard"></span><h2>3. 查看dashboard<a class="headerlink" href="#dashboard" title="永久链接至标题">¶</a></h2>
<p>输入<a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a>，按enter/回车，会展示当前进程的信息，按<code class="docutils literal notranslate"><span class="pre">ctrl+c</span></code>可以中断执行。</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ dashboard
ID NAME GROUP PRIORI STATE %CPU TIME INTERRU DAEMON
17 pool-2-thread-1 system 5 WAITIN 67 0:0 false false
27 Timer-for-arthas-dashb system 10 RUNNAB 32 0:0 false true
11 AsyncAppender-Worker-a system 9 WAITIN 0 0:0 false true
9 Attach Listener system 9 RUNNAB 0 0:0 false true
3 Finalizer system 8 WAITIN 0 0:0 false true
2 Reference Handler system 10 WAITIN 0 0:0 false true
4 Signal Dispatcher system 9 RUNNAB 0 0:0 false true
26 as-command-execute-dae system 10 TIMED_ 0 0:0 false true
13 job-timeout system 9 TIMED_ 0 0:0 false true
1 main main 5 TIMED_ 0 0:0 false false
14 nioEventLoopGroup-2-1 system 10 RUNNAB 0 0:0 false false
18 nioEventLoopGroup-2-2 system 10 RUNNAB 0 0:0 false false
23 nioEventLoopGroup-2-3 system 10 RUNNAB 0 0:0 false false
15 nioEventLoopGroup-3-1 system 10 RUNNAB 0 0:0 false false
Memory used total max usage GC
heap 32M 155M 1820M 1.77% gc.ps_scavenge.count 4
ps_eden_space 14M 65M 672M 2.21% gc.ps_scavenge.time(m 166
ps_survivor_space 4M 5M 5M s)
ps_old_gen 12M 85M 1365M 0.91% gc.ps_marksweep.count 0
nonheap 20M 23M -1 gc.ps_marksweep.time( 0
code_cache 3M 5M 240M 1.32% ms)
Runtime
os.name Mac OS X
os.version 10.13.4
java.version 1.8.0_162
java.home /Library/Java/JavaVir
tualMachines/jdk1.8.0
_162.jdk/Contents/Hom
e/jre
</pre></div>
</div>
</div>
<div class="section" id="watch">
<span id="watch"></span><h2>4. watch<a class="headerlink" href="#watch" title="永久链接至标题">¶</a></h2>
<p>通过<a class="reference internal" href="watch.html"><span class="doc">watch</span></a>命令来查看<code class="docutils literal notranslate"><span class="pre">Counter.value()</span></code>函数的返回值：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ watch Demo$Counter value returnObj
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 29 ms.
ts=2018-09-10 17:53:11;result=@Integer[621]
ts=2018-09-10 17:53:12;result=@Integer[622]
ts=2018-09-10 17:53:13;result=@Integer[623]
ts=2018-09-10 17:53:14;result=@Integer[624]
ts=2018-09-10 17:53:15;result=@Integer[625]
</pre></div>
</div>
<p>更多的功能可以查看<a class="reference internal" href="advanced-use.html"><span class="doc">进阶使用</span></a>。</p>
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