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< 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 >
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< 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" > curl -O 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，再执行质因数分解，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（ ， ） ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > curl -O 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， < 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， ： < 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， ， < code class = "docutils literal notranslate" > < span class = "pre" > 回车/enter< / span > < / code > 。Arthas会attach到目标进程上， ： < / 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 >
< / div >
< 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， < / 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 >
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< 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， ， < / p >
< p > 如果想完全退出arthas， < code class = "docutils literal notranslate" > < span class = "pre" > stop< / span > < / code > 命令。< / p >
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