Re: [I] bthread signal & wait 问题咨询 (brpc)

[via GitHub]

MJY-HUST commented on issue #2849:
URL: https://github.com/apache/brpc/issues/2849#issuecomment-2548188610

   
我看现在parking_lot的数量是写死的，一个tag内只有四个；一旦worker数量多了，futex中锁的竞争就上来了，想问一下这个值改成一个可配的参数或者根据tag所属的worker总数来动态调大会有什么负面影响吗？（比如parking_lot的数量
 = bthread_concurrency_by_tag / 4 or 8）。
   我自己做了一些测试，除了上述的做法之外，减少无效的signal和在wait前先steal一次也能解决一部分问题。
   相同的负载:
   启动四个rpc_press
   ./rpc_press -proto=echo_c++/echo.proto -method=example.EchoService.Echo 
-input='{"message":"hello"}' -qps=100000 -server=0.0.0.0:8000 -timeout_ms=-1 
   
服务端使用example/echo_c++中的，server，worker线程数量为64个，但是在服务内增加了使用bthread_start_background创建两个bthread来模拟触发signal的行为，优化前后：
    前：
   
![image](https://github.com/user-attachments/assets/d6b30d8d-fb2b-4165-b9f6-6ee04015c1d5)
   
![image](https://github.com/user-attachments/assets/239860bc-3b97-466c-90b2-f9294200772f)
   
![image](https://github.com/user-attachments/assets/9e852c19-79d0-48b9-bfe3-80600c4689bf)
   
   
   后：parking_lot改为16个
   
![image](https://github.com/user-attachments/assets/93f071dc-a196-4d46-9b2c-39f78fb64819)
   
![image](https://github.com/user-attachments/assets/d3aa30d0-8c6f-412a-9bc9-393304be0bbd)
   
![image](https://github.com/user-attachments/assets/25d0e6b0-1941-4004-a6ed-0344b1b904ee)
   
   


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