zkh2016 opened a new issue #1323:
URL: https://github.com/apache/incubator-brpc/issues/1323


   **Describe the bug (描述bug)**
   最近用rpc_replay压测一个server发现这样一个现象:
   1. 当压到比如4000qps的时候就出现超时了,但是这时候的CPU,内存,网络带宽等资源都还足够继续往上压。
   2. 
在一台机器上开启两个server进程(不同端口),开多个rpc_replay(与server不同机器)压这两个server的时候可以压到大于4000qps,直到各种资源不足以继续往上压为止。
   3. 另一种情况,开一个server进程,开两个rpc_replay可以比一个rpc_replay压的高。
   
   附件是用perf工具生成的火焰图,可以把后缀'.txt'去掉打开查看。
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   
   
[out.svg.txt](https://github.com/apache/incubator-brpc/files/5780401/out.svg.txt)
   
   期望server端单进程也能压到最大值。
   
   **Versions (各种版本)**
   OS: CentOS Linux release 7.4.1708 (Core)
   Compiler: gcc 4.8.5
   brpc: 0.9.7
   protobuf: libprotobuf.so.18
   
   
   **Additional context/screenshots (更多上下文/截图)**
   
   
[out.svg.txt](https://github.com/apache/incubator-brpc/files/5780403/out.svg.txt)
   


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