Arthas online positioning tool is simple to use arthas to install and use Alibaba performance tuning tools

1. The following is the arthas official website with very detailed usage documentation:

Introduction | arthas

2. Officially recommended downloads and usage methods:

# 自己找个文件夹下载arthas jar包
cd /home
# 下载
curl -O https://arthas.aliyun.com/arthas-boot.jar
# 运行
java -jar arthas-boot.jar

3. Select the monitored jar port (just enter the number)

 4. Command line input: dashboard

5. thread 19 to view thread running

 6. Decompile jad command :

# 查看类
jad cn.test.mobile.controller.order.OrderController


# 查看方法
jad cn.test.mobile.controller.order.OrderController getOrderInfo

   Function: Check whether the compiled version is correct

7. trace command :

    Function: Output the internal calling path of the method and the time consumption of each node on the path

#  命令-j是指过滤掉jdk中的方法
trace -j cn.test.mobile.controller.order.OrderController getOrderInfo


# 查看耗时长的： 单位ms   ==>大于10ms 的
trace -j cn.test.mobile.controller.order.OrderController getOrderInfo '#cost > 10'

8.  watch command :

     Function: Monitor the input parameters and return values ​​of the method

parameter name	Parameter Description
class-pattern	Class name expression matching
method-pattern	Method name expression matching
express	observation expression
condition-express	conditional expression
[b]	Observe before method call
[e]	Observe after method exception
[s]	Observe after the method returns
[f]	Observe after the method ends (normal return and exception return) , default option
[E]	Enable regular expression matching. The default is wildcard matching.
[x:]	Specifies the attribute traversal depth of the output result, the default is 1

  

# 遍历深度2 
watch cn.test.mobile.controller.order.OrderController getOrderInfo "{params,returnObj}" -x 2

7. For many other commands, please check the official website