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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>
<li class="toctree-l2"><a class="reference internal" href="#arthas">2. 启动arthas</a></li>
<li class="toctree-l2"><a class="reference internal" href="#dashboard">3. 查看dashboard</a></li>
<li class="toctree-l2"><a class="reference internal" href="#threadarthas-demomain-class">4. 通过thread命令来获取到<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>进程的Main Class</a></li>
<li class="toctree-l2"><a class="reference internal" href="#jadmain-class">5. 通过jad来反编译Main Class</a></li>
<li class="toctree-l2"><a class="reference internal" href="#watch">6. watch</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id2">7. 退出arthas</a></li>
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<div class="section" id="id1">
<h1>快速入门<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h1>
<div class="section" id="demo">
<h2>1. 启动Demo<a class="headerlink" href="#demo" title="永久链接至标题">¶</a></h2>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">wget https://alibaba.github.io/arthas/arthas-demo.jar
java -jar arthas-demo.jar</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>是一个简单的程序，每隔一秒生成一个随机数，再执行质因式分解，并打印出分解结果。</p>
<p><code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>源代码：<a class="reference external" href="https://github.com/alibaba/arthas/blob/master/demo/src/main/java/demo/MathGame.java">查看</a></p>
</div>
<div class="section" id="arthas">
<h2>2. 启动arthas<a class="headerlink" href="#arthas" title="永久链接至标题">¶</a></h2>
<p>在命令行下面执行（使用和目标进程一致的用户启动，否则可能attach失败）：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">wget https://alibaba.github.io/arthas/arthas-boot.jar
java -jar arthas-boot.jar</pre></div>
</div>
<ul class="simple">
<li><p>执行该程序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">java</span> <span class="pre">-jar</span> <span class="pre">arthas-boot.jar</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">java</span> <span class="pre">-jar</span> <span class="pre">arthas-boot.jar</span></code>。</p></li>
<li><p>如果attach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。</p></li>
<li><p>如果下载速度比较慢，可以使用aliyun的镜像：<code class="docutils literal notranslate"><span class="pre">java</span> <span class="pre">-jar</span> <span class="pre">arthas-boot.jar</span> <span class="pre">--repo-mirror</span> <span class="pre">aliyun</span> <span class="pre">--use-http</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">java</span> <span class="pre">-jar</span> <span class="pre">arthas-boot.jar</span> <span class="pre">-h</span></code> 打印更多参数信息。</p></li>
</ul>
<p>选择应用java进程：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ $ java -jar arthas-boot.jar
* [1]: 35542
[2]: 71560 arthas-demo.jar</pre></div>
</div>
<p>Demo进程是第2个，则输入2，再输入<code class="docutils literal notranslate"><span class="pre">回车/enter</span></code>。Arthas会attach到目标进程上，并输出日志：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">[INFO] Try to attach process 71560
[INFO] Attach process 71560 success.
[INFO] arthas-client connect 127.0.0.1 3658
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\ \ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki: https://alibaba.github.io/arthas
version: 3.0.5.20181127201536
pid: 71560
time: 2018-11-28 19:16:24
$</pre></div>
</div>
</div>
<div class="section" id="dashboard">
<h2>3. 查看dashboard<a class="headerlink" href="#dashboard" title="永久链接至标题">¶</a></h2>
<p>输入<a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a>，按<code class="docutils literal notranslate"><span class="pre">回车/enter</span></code>，会展示当前进程的信息，按<code class="docutils literal notranslate"><span class="pre">ctrl+c</span></code>可以中断执行。</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ 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>
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<div class="section" id="threadarthas-demomain-class">
<h2>4. 通过thread命令来获取到<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>进程的Main Class<a class="headerlink" href="#threadarthas-demomain-class" title="永久链接至标题">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">thread</span> <span class="pre">1</span></code>会打印线程ID 1的栈，通常是main函数的线程。</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ thread 1 | grep 'main('
at demo.MathGame.main(MathGame.java:17)</pre></div>
</div>
</div>
<div class="section" id="jadmain-class">
<h2>5. 通过jad来反编译Main Class<a class="headerlink" href="#jadmain-class" title="永久链接至标题">¶</a></h2>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad demo.MathGame
ClassLoader:
+-sun.misc.Launcher$AppClassLoader@3d4eac69
+-sun.misc.Launcher$ExtClassLoader@66350f69
Location:
/tmp/arthas-demo.jar
/*
* Decompiled with CFR 0_132.
*/
package demo;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
public class MathGame {
private static Random random = new Random();
private int illegalArgumentCount = 0;
public static void main(String[] args) throws InterruptedException {
MathGame game = new MathGame();
do {
game.run();
TimeUnit.SECONDS.sleep(1L);
} while (true);
}
public void run() throws InterruptedException {
try {
int number = random.nextInt();
List<Integer> primeFactors = this.primeFactors(number);
MathGame.print(number, primeFactors);
}
catch (Exception e) {
System.out.println(String.format("illegalArgumentCount:%3d, ", this.illegalArgumentCount) + e.getMessage());
}
}
public static void print(int number, List<Integer> primeFactors) {
StringBuffer sb = new StringBuffer("" + number + "=");
Iterator<Integer> iterator = primeFactors.iterator();
while (iterator.hasNext()) {
int factor = iterator.next();
sb.append(factor).append('*');
}
if (sb.charAt(sb.length() - 1) == '*') {
sb.deleteCharAt(sb.length() - 1);
}
System.out.println(sb);
}
public List<Integer> primeFactors(int number) {
if (number < 2) {
++this.illegalArgumentCount;
throw new IllegalArgumentException("number is: " + number + ", need >= 2");
}
ArrayList<Integer> result = new ArrayList<Integer>();
int i = 2;
while (i <= number) {
if (number % i == 0) {
result.add(i);
number /= i;
i = 2;
continue;
}
++i;
}
return result;
}
}
Affect(row-cnt:1) cost in 970 ms.</pre></div>
</div>
</div>
<div class="section" id="watch">
<h2>6. 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">demo.MathGame#primeFactors</span></code>函数的返回值：</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors returnObj
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 107 ms.
ts=2018-11-28 19:22:30; [cost=1.715367ms] result=null
ts=2018-11-28 19:22:31; [cost=0.185203ms] result=null
ts=2018-11-28 19:22:32; [cost=19.012416ms] result=@ArrayList[
@Integer[5],
@Integer[47],
@Integer[2675531],
]
ts=2018-11-28 19:22:33; [cost=0.311395ms] result=@ArrayList[
@Integer[2],
@Integer[5],
@Integer[317],
@Integer[503],
@Integer[887],
]
ts=2018-11-28 19:22:34; [cost=10.136007ms] result=@ArrayList[
@Integer[2],
@Integer[2],
@Integer[3],
@Integer[3],
@Integer[31],
@Integer[717593],
]
ts=2018-11-28 19:22:35; [cost=29.969732ms] result=@ArrayList[
@Integer[5],
@Integer[29],
@Integer[7651739],
]</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>
</div>
<div class="section" id="id2">
<h2>7. 退出arthas<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
<p>如果只是退出当前的连接，可以用<code class="docutils literal notranslate"><span class="pre">quit</span></code>或者<code class="docutils literal notranslate"><span class="pre">exit</span></code>命令。Attach到目标进程上的arthas还会继续运行，端口会保持开放，下次连接时可以直接连接上。</p>
<p>如果想完全退出arthas，可以执行<code class="docutils literal notranslate"><span class="pre">shutdown</span></code>命令。</p>
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