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# 快速入门
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可以通过下面的方式自己动手实践，也可以通过我们的[在线教程](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=arthas-basics)，跟随教程快速入门。
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## 1. 启动 math-game
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```bash
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curl -O https://arthas.aliyun.com/math-game.jar
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java -jar math-game.jar
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```
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`math-game`是一个简单的程序，每隔一秒生成一个随机数，再执行质因数分解，并打印出分解结果。
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`math-game`源代码：[查看](https://github.com/alibaba/arthas/blob/master/math-game/src/main/java/demo/MathGame.java)
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## 2. 启动 arthas
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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）：
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```bash
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curl -O https://arthas.aliyun.com/arthas-boot.jar
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java -jar arthas-boot.jar
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```
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- 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`admin`用户来执行：`sudo su admin && java -jar arthas-boot.jar` 或 `sudo -u admin -EH java -jar arthas-boot.jar`。
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- 如果 attach 不上目标进程，可以查看`~/logs/arthas/` 目录下的日志。
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- 如果下载速度比较慢，可以使用 aliyun 的镜像：`java -jar arthas-boot.jar --repo-mirror aliyun --use-http`
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- `java -jar arthas-boot.jar -h` 打印更多参数信息。
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选择应用 java 进程：
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```bash
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$ $ java -jar arthas-boot.jar
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* [1]: 35542
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[2]: 71560 math-game.jar
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```
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`math-game`进程是第 2 个，则输入 2，再输入`回车/enter`。Arthas 会 attach 到目标进程上，并输出日志：
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```bash
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[INFO] Try to attach process 71560
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[INFO] Attach process 71560 success.
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[INFO] arthas-client connect 127.0.0.1 3658
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,---. ,------. ,--------.,--. ,--. ,---. ,---.
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/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
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| .-. || '--'.' | | | .--. || .-. |`. `-.
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| | | || |\ \ | | | | | || | | |.-' |
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`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
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wiki: https://arthas.aliyun.com/doc
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version: 3.0.5.20181127201536
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pid: 71560
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time: 2018-11-28 19:16:24
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$
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```
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## 3. 查看 dashboard
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输入[dashboard](dashboard.md)，按`回车/enter`，会展示当前进程的信息，按`ctrl+c`可以中断执行。
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```bash
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$ dashboard
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ID NAME GROUP PRIORI STATE %CPU TIME INTERRU DAEMON
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17 pool-2-thread-1 system 5 WAITIN 67 0:0 false false
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27 Timer-for-arthas-dashb system 10 RUNNAB 32 0:0 false true
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11 AsyncAppender-Worker-a system 9 WAITIN 0 0:0 false true
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9 Attach Listener system 9 RUNNAB 0 0:0 false true
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3 Finalizer system 8 WAITIN 0 0:0 false true
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2 Reference Handler system 10 WAITIN 0 0:0 false true
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4 Signal Dispatcher system 9 RUNNAB 0 0:0 false true
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26 as-command-execute-dae system 10 TIMED_ 0 0:0 false true
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13 job-timeout system 9 TIMED_ 0 0:0 false true
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1 main main 5 TIMED_ 0 0:0 false false
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14 nioEventLoopGroup-2-1 system 10 RUNNAB 0 0:0 false false
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18 nioEventLoopGroup-2-2 system 10 RUNNAB 0 0:0 false false
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23 nioEventLoopGroup-2-3 system 10 RUNNAB 0 0:0 false false
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15 nioEventLoopGroup-3-1 system 10 RUNNAB 0 0:0 false false
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Memory used total max usage GC
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heap 32M 155M 1820M 1.77% gc.ps_scavenge.count 4
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ps_eden_space 14M 65M 672M 2.21% gc.ps_scavenge.time(m 166
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ps_survivor_space 4M 5M 5M s)
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ps_old_gen 12M 85M 1365M 0.91% gc.ps_marksweep.count 0
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nonheap 20M 23M -1 gc.ps_marksweep.time( 0
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code_cache 3M 5M 240M 1.32% ms)
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Runtime
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os.name Mac OS X
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os.version 10.13.4
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java.version 1.8.0_162
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java.home /Library/Java/JavaVir
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tualMachines/jdk1.8.0
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_162.jdk/Contents/Hom
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e/jre
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```
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## 4. 通过 thread 命令来获取到`math-game`进程的 Main Class
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`thread 1`会打印线程 ID 1 的栈，通常是 main 函数的线程。
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```bash
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$ thread 1 | grep 'main('
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at demo.MathGame.main(MathGame.java:17)
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```
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## 5. 通过 jad 来反编译 Main Class
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```java
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$ jad demo.MathGame
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ClassLoader:
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+-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Location:
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/tmp/math-game.jar
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/*
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* Decompiled with CFR 0_132.
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*/
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package demo;
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import java.io.PrintStream;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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public class MathGame {
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private static Random random = new Random();
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private int illegalArgumentCount = 0;
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public static void main(String[] args) throws InterruptedException {
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MathGame game = new MathGame();
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do {
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game.run();
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TimeUnit.SECONDS.sleep(1L);
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} while (true);
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}
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public void run() throws InterruptedException {
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try {
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int number = random.nextInt();
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List<Integer> primeFactors = this.primeFactors(number);
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MathGame.print(number, primeFactors);
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}
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catch (Exception e) {
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System.out.println(String.format("illegalArgumentCount:%3d, ", this.illegalArgumentCount) + e.getMessage());
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}
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}
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public static void print(int number, List<Integer> primeFactors) {
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StringBuffer sb = new StringBuffer("" + number + "=");
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Iterator<Integer> iterator = primeFactors.iterator();
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while (iterator.hasNext()) {
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int factor = iterator.next();
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sb.append(factor).append('*');
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}
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if (sb.charAt(sb.length() - 1) == '*') {
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sb.deleteCharAt(sb.length() - 1);
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}
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System.out.println(sb);
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}
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public List<Integer> primeFactors(int number) {
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if (number < 2) {
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++this.illegalArgumentCount;
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throw new IllegalArgumentException("number is: " + number + ", need >= 2");
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}
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ArrayList<Integer> result = new ArrayList<Integer>();
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int i = 2;
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while (i <= number) {
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if (number % i == 0) {
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result.add(i);
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number /= i;
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i = 2;
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continue;
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}
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++i;
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}
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return result;
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}
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}
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Affect(row-cnt:1) cost in 970 ms.
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```
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## 6. watch
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通过[watch](watch.md)命令来查看`demo.MathGame#primeFactors`函数的返回值：
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```bash
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$ watch demo.MathGame primeFactors returnObj
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 107 ms.
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ts=2018-11-28 19:22:30; [cost=1.715367ms] result=null
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ts=2018-11-28 19:22:31; [cost=0.185203ms] result=null
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ts=2018-11-28 19:22:32; [cost=19.012416ms] result=@ArrayList[
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@Integer[5],
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@Integer[47],
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@Integer[2675531],
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]
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ts=2018-11-28 19:22:33; [cost=0.311395ms] result=@ArrayList[
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@Integer[2],
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@Integer[5],
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@Integer[317],
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@Integer[503],
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@Integer[887],
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]
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ts=2018-11-28 19:22:34; [cost=10.136007ms] result=@ArrayList[
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@Integer[2],
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@Integer[2],
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@Integer[3],
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@Integer[3],
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@Integer[31],
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@Integer[717593],
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]
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ts=2018-11-28 19:22:35; [cost=29.969732ms] result=@ArrayList[
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@Integer[5],
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@Integer[29],
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@Integer[7651739],
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]
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```
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更多的功能可以查看[进阶教程](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=arthas-advanced)。
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## 7. 退出 arthas
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如果只是退出当前的连接，可以用`quit`或者`exit`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。
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如果想完全退出 arthas，可以执行`stop`命令。
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