[GitHub] [incubator-brpc] heyuyi0906 commented on pull request #1175: about support protobuf arena

[GitBox <gi...@apache.org>]

heyuyi0906 commented on pull request #1175:
URL: https://github.com/apache/incubator-brpc/pull/1175#issuecomment-671292722


   在大包情况下，自测发现对于性能提升还是比较明显的。
   support_pb_arena分支测试结果：
   ![image](https://user-images.githubusercontent.com/67617182/89775545-916f7700-daf7-11ea-91cf-0eeb8a941cbe.png)
   master分支测试结果：
   ![image](https://user-images.githubusercontent.com/67617182/89775597-ad731880-daf7-11ea-979c-11ea4bc99907.png)
   
   测试条件：
   机器：8核 Intel(R) Xeon(R) Platinum 8255C CPU @ 2.50GHz
   protobuf版本：v3.6.1
   压测工具：rpc_press thread_num=50
   协议：
   ```
   syntax="proto2";
   package example;
   
   option cc_generic_services = true;
   
   message Obj {
       optional uint64 val = 1;
   };
   
   message EchoRequest {
       required string message = 1;
       repeated double array = 2;
       repeated Obj objs = 3;
   };
   
   message EchoResponse {
       required string message = 1;
       repeated double array = 2;
       repeated Obj objs = 3;
   };
   
   service EchoService {
         rpc Echo(EchoRequest) returns (EchoResponse);
   };
   ```
   server处理逻辑：
   ```
           response->set_message(request->message());
   
           for (int i = 0; i < request->array_size(); ++i) {
               response->add_array(request->array(i));
           }
   
           for (int i = 0; i < request->objs_size(); ++i) {
               auto o = response->add_objs();
               o->set_val(request->objs(i).val());
           }
   ```
   压测input：
   ```
   {
     "message":"xxx......", 
     "array":[2.9,2.9,......],
     "objs":[{"val":10},......]
   }
   ```
   message字符串长度16384
   array包含8192个double
   objs包含8192个对象
   


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