prepare to test

E1016 04:02:31.133311  7976 async_benchmark.cc:57] start to send
E1016 04:02:33.856057  7976 async_benchmark.cc:82] all completed
E1016 04:02:33.856125  7976 async_benchmark.cc:83] 800000 completed in 2711 ms
 QPS: 295094
 latency: 1350214 us
 min latency: 659 us
 max latency: 2251525 us
Merge branch 'rpc' of ssh://github.com/lenxyang/emmet2 into rpc