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快速入门
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===
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## 1. 启动Demo
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```java
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicInteger;
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public class Demo {
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static class Counter {
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private static AtomicInteger count = new AtomicInteger(0);
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public static void increment() {
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count.incrementAndGet();
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}
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public static int value() {
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return count.get();
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}
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}
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public static void main(String[] args) throws InterruptedException {
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while (true) {
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Counter.increment();
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System.out.println("counter: " + Counter.value());
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TimeUnit.SECONDS.sleep(1);
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}
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}
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}
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```
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把上面的内容保存到`Demo.java`里，然后在命令行下编绎启动：
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```bash
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javac Demo.java
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java Demo
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```
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也可以把代码保存到IDE里，然后启动。
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## 2. 启动arthas
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### Linux/Unix/Mac
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在命令行下面执行：
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```bash
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./as.sh
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```
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> 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`admin`用户来执行：
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> `sudo su admin && ./as.sh` 或 `sudo -u admin -EH ./as.sh`。
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> 详细的启动脚本说明，请参考[这里](start-arthas.md)。
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> 如果attatch不上目标进程，可以查看`~/logs/arthas/` 目录下的日志。
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选择应用java进程：
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```
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$ ./as.sh
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Arthas script version: 3.0.2
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Found existing java process, please choose one and hit RETURN.
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* [1]: 95428
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[2]: 22647 org.jetbrains.jps.cmdline.Launcher
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[3]: 21736
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[4]: 13560 Demo
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```
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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：
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```
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Connecting to arthas server... current timestamp is 1536656867
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Trying 127.0.0.1...
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Connected to 127.0.0.1.
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Escape character is '^]'.
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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://alibaba.github.io/arthas
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version: 3.0.1-RC-SNAPSHOT
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pid: 13560
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timestamp: 1536656867894
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```
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### Windows
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打开Dos命令行窗口，在解压的arthas目录下执行`as.bat`。
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## 3. 查看dashboard
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输入[dashboard](dashboard.md)，按enter/回车，会展示当前进程的信息，按`ctrl+c`可以中断执行。
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```
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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. watch
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通过[watch](watch.md)命令来查看`Counter.value()`函数的返回值：
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```
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$ watch Demo$Counter value returnObj
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 29 ms.
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ts=2018-09-10 17:53:11;result=@Integer[621]
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ts=2018-09-10 17:53:12;result=@Integer[622]
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ts=2018-09-10 17:53:13;result=@Integer[623]
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ts=2018-09-10 17:53:14;result=@Integer[624]
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ts=2018-09-10 17:53:15;result=@Integer[625]
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```
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更多的功能可以查看[进阶使用](advanced-use.md)。
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