下载 wget https://alibaba.github.io/arthas/arthas-boot.jar
找到想要关注的进程号
运行启动arthas
java -jar arthas-boot.jar
[rest@bms-billimport002 tmp]$ java -jar arthas-boot.jar
[INFO] arthas-boot version: 3.1.1
[INFO] Found existing java process, please choose one and hit RETURN.
* [1]: 31298 org.apache.catalina.startup.Bootstrap
[2]: 12581 org.apache.catalina.startup.Bootstrap
[3]: 5477 org.apache.catalina.startup.Bootstrap
选择进程号
dashboard命令查询线程情况
$ dashboard
sc命令搜索类
$sc *DispatcherServlet*
sm命令搜索方法
$sm org.springframework.web.servlet.DispatcherServlet
watch 命令查看方法参数与方法返回数据, -x 表示指定打印参数或返回值的层级
$ watch org.springframework.web.servlet.DispatcherServlet noHandlerFound params
$ watch org.springframework.web.servlet.DispatcherServlet noHandlerFound returnObj
$ watch org.springframework.web.servlet.DispatcherServlet noHandlerFound {params,returnObj} -x 2
通过thread命令查看线程
$ thread
Threads Total: 89, NEW: 0, RUNNABLE: 25, BLOCKED: 0, WAITING: 40, TIMED_WAITING: 24, TERMINATED: 0
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
1313 as-command-execute-daemon system 10 RUNNABLE 58 0:0 false true
19 localhost-startStop-1-SendThread(10.168.155.25: main 5 RUNNABLE 19 0:20 false true
105 DubboResponseTimeoutScanTimer main 5 TIMED_WAITING 9 4:0 false true
90 http-nio-7071-ClientPoller-1 main 5 RUNNABLE 4 0:12 false true
31 Hashed wheel timer #1 main 5 TIMED_WAITING 3 1:40 false false
32 New I/O boss #4 main 5 RUNNABLE 2 0:20 false true
查看当前最繁忙的几个线程
$ thread -n 2
"as-command-execute-daemon" Id=1316 cpuUsage=59% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:133)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:79)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:370)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Number of locked synchronizers = 1
- java.util.concurrent.ThreadPoolExecutor$Worker@2bb3a482
"DubboResponseTimeoutScanTimer" Id=105 cpuUsage=12% TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture$RemotingInvocationTimeoutScan.run(DefaultFuture.java:300)
at java.lang.Thread.run(Thread.java:745)
通过jad名反编译类
$ jad org.springframework.web.servlet.DispatcherServlet
ClassLoader:
+-WebappClassLoader
context:
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
java.net.URLClassLoader@1100c7e4
+-java.net.URLClassLoader@1100c7e4
+-sun.misc.Launcher$AppClassLoader@5bdf59bd
+-sun.misc.Launcher$ExtClassLoader@247cb66a
.....
其他命令， trace， stack
参考文档：https://alibaba.github.io/arthas/index.html
exit 退出
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