[GitHub] [incubator-brpc] chongg039 opened a new issue #1710: EventDispatcher Run调用epoll_wait导致cpu持续高

Thu, 03 Mar 2022 00:36:54 -0800 


chongg039 opened a new issue #1710:
URL: https://github.com/apache/incubator-brpc/issues/1710


   **Describe the bug (描述bug)**
   
我有一个主服务，会启动一个bthread线程执行某些脚本，过程中会有一些fork行为。此外会启动另一个bthread线程，来获取脚本进程的系统资源使用（cpu、rss等）。当触发某些条件时，会杀掉脚本进程组，两个bthread线程会自行退出。
   
   但是当bthread线程return后，主服务进程的cpu便会持续升高，gdb发现有一个LWP会call 
EventDispatcher，一个持续epoll_wait的行为会占满100%cpu，并且LWP的id会发生变化。
   
   top -Hp信息
   
![image](https://user-images.githubusercontent.com/18239939/156523924-2883701e-cae0-4d74-9a88-0501b0a23d32.png)
   
   gdb信息：
   
![image](https://user-images.githubusercontent.com/18239939/156523581-f207208d-e98f-4ce5-a813-8474e6d2780f.png)
   
   perf top信息：
   
![image](https://user-images.githubusercontent.com/18239939/156524169-ab524e93-6e77-404c-9b40-d101c1888892.png)
   
   bthread前后信息：
   运行时信息：
   
![image](https://user-images.githubusercontent.com/18239939/156526311-db6f60c8-038b-41aa-b89b-68bfbacb6f62.png)
   
   杀死脚本进程，两个bthread退出后信息：
   
![image](https://user-images.githubusercontent.com/18239939/156526570-b4af0b3f-48df-46bb-9f31-02de7bb5db3f.png)
   
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   导致cpu升高的原因是什么，如何避免？
   
   **Versions (各种版本)**
   OS: linux 4.19
   Compiler: gcc-4.9.2
   brpc: 0.9.7
   protobuf: 2.4.1
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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