阿尔萨斯
查找类和方法
sc *ServiceInstallService
// 子方法
sm com.base.service.serviceinstall.ServiceInstallService saveAndSend*
[arthas@19572]$ sc *ServiceInstallService
com.base.service.serviceinstall.ServiceInstallService
com.base.service.serviceinstall.ServiceInstallService$$EnhancerBySpringCGLIB$$8de8d2d6
Affect(row-cnt:2) cost in 158 ms.
[arthas@19572]$ sm com.base.service.serviceinstall.ServiceInstallService saveAndSend*
com.base.service.serviceinstall.ServiceInstallService saveAndSendConfig(Ljava/util/Map;Ljava/util/ArrayList;I)V
Affect(row-cnt:1) cost in 27 ms.
[arthas@19572]$ watch com.base.service.serviceinstall.ServiceInstallService saveAndSendConfig "{params}" -x 3
观察方法出参和返回值
$ watch demo.MathGame primeFactors "{params,returnObj}" -x 3
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 44 ms.
ts=2018-12-03 19:16:51; [cost=1.280502ms] result=@ArrayList[
@Object[][
@Integer[535629513],
],
@ArrayList[
@Integer[3],
@Integer[19],
@Integer[191],
@Integer[49199],
],
]
调整-x的值，观察具体的方法参数值
$ watch demo.MathGame primeFactors "{params,target}" -x 3
-x表示遍历深度，可以调整来打印具体的参数和结果内容，默认值是1。
观察异常信息的例子
$ watch demo.MathGame primeFactors "{params[0],throwExp}" -e -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 62 ms.
ts=2018-12-03 19:38:00; [cost=1.414993ms] result=@ArrayList[
@Integer[-1120397038],
java.lang.IllegalArgumentException: number is: -1120397038, need >= 2
at demo.MathGame.primeFactors(MathGame.java:46)
at demo.MathGame.run(MathGame.java:24)
at demo.MathGame.main(MathGame.java:16)
,
]
-e表示抛出异常时才触发- express中，表示异常信息的变量是
throwExp
查询服务调用耗时 trace
trace com.syncore.nebula.service.chatflowbackend.service.chatflow.impl.ChatflowServiceImpl nluToNluEntry -n 5 --skipJDKMethod false
- --skipJDKMethod false 跳过 JDK 方法，默认 true 跳过
- -n 表示处理多少次请求
触发方法执行，可通过swagger或postman等工具触发方法，即可显示整条链路具体执行时间，最耗时代码会标记红色
$ trace --skipJDKMethod false demo.MathGame run
Press Q or Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 60 ms.
`---ts=2019-12-04 00:44:41;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
`---[1.357742ms] demo.MathGame:run()
+---[0.028624ms] java.util.Random:nextInt() #23
+---[0.045534ms] demo.MathGame:primeFactors() #24 [throws Exception]
+---[0.005372ms] java.lang.StringBuilder:<init>() #28
+---[0.012257ms] java.lang.Integer:valueOf() #28
+---[0.234537ms] java.lang.String:format() #28
+---[min=0.004539ms,max=0.005778ms,total=0.010317ms,count=2] java.lang.StringBuilder:append() #28
+---[0.013777ms] java.lang.Exception:getMessage() #28
+---[0.004935ms] java.lang.StringBuilder:toString() #28
`---[0.06941ms] java.io.PrintStream:println() #28
`---ts=2019-12-04 00:44:42;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
`---[3.030432ms] demo.MathGame:run()
+---[0.010473ms] java.util.Random:nextInt() #23
+---[0.023715ms] demo.MathGame:primeFactors() #24 [throws Exception]
+---[0.005198ms] java.lang.StringBuilder:<init>() #28
+---[0.006405ms] java.lang.Integer:valueOf() #28
+---[0.178583ms] java.lang.String:format() #28
+---[min=0.011636ms,max=0.838077ms,total=0.849713ms,count=2] java.lang.StringBuilder:append() #28
+---[0.008747ms] java.lang.Exception:getMessage() #28
+---[0.019768ms] java.lang.StringBuilder:toString() #28
`---[0.076457ms] java.io.PrintStream:println() #28