Benchmark brpc and grpc for send/recv op
Created by: typhoonzero
Related: https://github.com/PaddlePaddle/Paddle/pull/5520
https://github.com/PaddlePaddle/Paddle/pull/5520#pullrequestreview-79059619
Created by: typhoonzero
Related: https://github.com/PaddlePaddle/Paddle/pull/5520
https://github.com/PaddlePaddle/Paddle/pull/5520#pullrequestreview-79059619