1.dashboard

输入dashboard，按回车/enter，会展示当前进程的信息，按ctrl+c可以中断执行

ID: Java级别的线程ID，注意这个ID不能跟jstack中的nativeID一一对应NAME: 线程名GROUP: 线程组名PRIORITY: 线程优先级, 1~10之间的数字，越大表示优先级越高STATE: 线程的状态CPU%: 线程消耗的cpu占比，采样100ms，将所有线程在这100ms内的cpu使用量求和，再算出每个线程的cpu使用占比。TIME: 线程运行总时间，数据格式为分：秒INTERRUPTED: 线程当前的中断位状态DAEMON: 是否是daemon线程

2.jad反编译指令

输入：jad + 文件全路径，如我想查看主启动类，则：

jad com.arthas.ArthasApplication

3.thread

最忙的前N个线程并打印堆栈

thread -n 3

所有线程的信息

thread

指定线程的运行堆栈

thread id

如上有线程ID为37的，所以这里指明id=37

当前阻塞其他线程的线程

thread -b

无阻塞返回

有阻塞返回

"http-bio-8080-exec-4" Id=27 TIMED_WAITING at java.lang.Thread.sleep(Native Method) at test.arthas.TestThreadBlocking.doGet(TestThreadBlocking.java:22) - locked java.lang.Object@725be470 <---- but blocks 4 other threads! at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at test.filter.TestDurexFilter.doFilter(TestDurexFilter.java:46) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at com.taobao.tomcat.valves.ContextLoadFilterValve$FilterChainAdapter.doFilter(ContextLoadFilterValve.java:191) at com.taobao.eagleeye.EagleEyeFilter.doFilter(EagleEyeFilter.java:81) at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke(ContextLoadFilterValve.java:150) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:429) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318) - locked org.apache.tomcat.util.net.SocketWrapper@7127ee12 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Number of locked synchronizers = 1 - java.util.concurrent.ThreadPoolExecutor$Worker@31a6493e

注意， 目前只支持找出synchronized关键字阻塞住的线程， 如果是java.util.concurrent.Lock， 目前还不支持。

指定采样时间间隔

thread -n 3 -i 间隔时间(ms)

查看指定状态的线程

thread –state

thread –state 状态

状态：[RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, NEW, TERMINATED]

4.watch

查看方法耗时出参

watch 类全路径 方法名 returnObj

如我有这样一个方法：

则指令为：

watch com.arthas.controller.ArthasController arthasTest returnObj

查看指定方法入参出参

watch com.arthas.controller.ArthasController arthasTest "{params,returnObj}" -x 2

观察异常信息

5.退出Arthas

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。

如果想完全退出arthas，可以执行stop命令。