阿里在线诊断工具----------Arthas
目录
- 官方地址
- 实时查看方法的入参-出参
- 记录几次现场的请求-返回数据
- 检查接口具体哪一个步骤慢
- 没有源码怎么办
- 线程相关
- 查看最忙的线程
- 查看正在阻塞别的线程的线程
- 查看线程堆栈
- 查看线程cpu占比
- 推荐公众号
官方地址
https://alibaba.github.io/arthas/
下面展示几种使用场景
实时查看方法的入参-出参
watch命令
[arthas@8279]$ watch com.example.controller.UserController getUser '{params,returnObj,throwExp}' -n 5 -x 3 '1==1'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 78 ms, listenerId: 1
ts=2020-06-09 20:19:08; [cost=165.157044ms] result=@ArrayList[
@Object[][
@Integer[5],
],
@User[
id=@Integer[5],
userName=null,
userPwd=null,
modified=@Date[2020-06-08 18:07:12,000],
created=null,
appType=null,
status=@Integer[0],
dbSet=null,
],
null,
]
如上打印信息，入参-出参很明显的列出来了
记录几次现场的请求-返回数据
记录getUser 三次请求-返回数据
为什么要指定次数，万一一瞬间请求量很大会撑爆内存
[arthas@8279]$ tt -t -n 3 com.example.controller.UserController getUser
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 46 ms, listenerId: 2
IND TIMESTAMP COST( IS- IS OBJECT CLASS METHOD
EX ms) RET -E
XP
--------------------------------------------------------------------------------
100 2020-06-09 2.424 tru fa 0x21a58d UserController getUser
0 20:24:50 631 e ls 5d
e
100 2020-06-09 2.027 tru fa 0x21a58d UserController getUser
1 20:24:52 686 e ls 5d
e
100 2020-06-09 1.325 tru fa 0x21a58d UserController getUser
2 20:24:52 218 e ls 5d
e
Command execution times exceed limit: 3, so command will exit. You can set it with -n option.
展示所有记录的请求-返回数据
[arthas@8279]$ tt -l
IND TIMESTAMP COST( IS- IS OBJECT CLASS METHOD
EX ms) RET -E
XP
--------------------------------------------------------------------------------
100 2020-06-09 2.424 tru fa 0x21a58d UserController getUser
0 20:24:50 631 e ls 5d
e
100 2020-06-09 2.027 tru fa 0x21a58d UserController getUser
1 20:24:52 686 e ls 5d
e
100 2020-06-09 1.325 tru fa 0x21a58d UserController getUser
2 20:24:52 218 e ls 5d
e
Affect(row-cnt:3) cost in 6 ms.
展示具体一次的请求-返回数据
[arthas@8279]$ tt -i 1000
INDEX 1000
GMT-CREATE 2020-06-09 20:24:50
COST(ms) 2.424631
OBJECT 0x21a58d5d
CLASS com.example.controller.UserController
METHOD getUser
IS-RETURN true
IS-EXCEPTION false
PARAMETERS[0] @Integer[5]
RETURN-OBJ @User[
id=@Integer[5],
userName=null,
userPwd=null,
modified=@Date[2020-06-08 18:07:12,000],
created=null,
appType=null,
status=@Integer[0],
dbSet=null,
]
Affect(row-cnt:1) cost in 5 ms.
由Arthas-重新请求一次
[arthas@8279]$ tt -i 1000 -p
RE-INDEX 1000
GMT-REPLAY 2020-06-09 20:26:30
OBJECT 0x21a58d5d
CLASS com.example.controller.UserController
METHOD getUser
PARAMETERS[0] @Integer[5]
IS-RETURN true
IS-EXCEPTION false
COST(ms) 3.14049
RETURN-OBJ @User[
id=@Integer[5],
userName=null,
userPwd=null,
modified=@Date[2020-06-08 18:07:12,000],
created=null,
appType=null,
status=@Integer[0],
dbSet=null,
]
Time fragment[1000] successfully replayed 1 times.
检查接口具体哪一个步骤慢
trace命令 查看接口中具体哪个方法慢
传统方式，在全部方法前后加时间(获取部分认为有可能慢的方法)，然后加日志
arthas方式
如上图所示，很明显的展示方法的耗时
参数请参考
https://alibaba.github.io/arthas/trace.html
没有源码怎么办
1.搜索项目中已加载的类
sc *Controller
[arthas@7387]$ sc *Controller
com.example.controller.CustomerSourceSelfController
com.example.controller.UserController
。。。。。。。。
返回加载的类
2.搜索某个类中有那些方法
sm com.example.controller.CustomerSourceSelfController
[arthas@7387]$ sm com.example.controller.UserController
com.example.controller.UserController ()V
com.example.controller.UserController GetUser(I)Ljava/lang/String;
Affect(row-cnt:2) cost in 40 ms.
可以看到有GetUser方法
3.反编译类
jad com.example.controller.UserController
[arthas@7387]$ jad com.example.controller.UserController
ClassLoader:
+-sun.misc.Launcher$AppClassLoader@18b4aac2
+-sun.misc.Launcher$ExtClassLoader@222114ba
Location:
/Users/admin/Downloads/cloud/springBoot_Mybatis/Springboot_Mybatis/target/classes/
/*
* Decompiled with CFR.
*
* Could not load the following classes:
* com.example.service.UserService
*/
package com.example.controller;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value={"/testBoot"})
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value={"getUser/{id}"})
public String GetUser(@PathVariable int id) {
return this.userService.Sel(id).toString();
}
}
Affect(row-cnt:1) cost in 961 ms.
线程相关
查看最忙的线程
会展示完整的堆栈和cpu占用率
[arthas@8279]$ thread -n 3
"as-command-execute-daemon" Id=89 cpuUsage=100% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:448)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:194)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:115)
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:372)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"Reference Handler" Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@156ce6cb
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.Reference$Lock@156ce6cb
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
"Finalizer" Id=3 cpuUsage=0% WAITING on java.lang.ref.ReferenceQueue$Lock@216e434e
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@216e434e
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)
查看正在阻塞别的线程的线程
[arthas@8539]$ thread -b
"http-nio-8077-exec-5" Id=28 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at com.example.controller.UserController.getUse2r(UserController.java:42)
- locked java.lang.Object@64ecdcc5 <---- but blocks 1 other threads!
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
查看线程堆栈
[arthas@8539]$ thread 3
"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@31258ebf
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@31258ebf
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)
Affect(row-cnt:0) cost in 2 ms.
查看线程cpu占比
thread -i 3
Threads Total: 32, NEW: 0, RUNNABLE: 12, BLOCKED: 0, WAITING: 14, TIMED_WAITING: 6, TERMINATED: 0
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
50 as-command-execute-daemon system 10 RUNNABLE 100 0:0 false true
16 Attach Listener system 9 RUNNABLE 0 0:0 false true
20 ContainerBackgroundProcessor[StandardEngine[ main 5 TIMED_WAITING 0 0:0 false true
39 DestroyJavaVM main 5 RUNNABLE 0 0:2 false false
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