twemperf 是一个用来测试 memcached 服务器性能的工具。

测试实例：

$ mcperf --linger=0 --timeout=5 --conn-rate=1000 --call-rate=1000 --num-calls=10 --num-conns=1000 --sizes=u1,16    Total: connections 1000 requests 10000 responses 10000 test-duration 1.009 s    Connection rate: 991.1 conn/s (1.0 ms/conn <= 23 concurrent connections)  Connection time [ms]: avg 10.3 min 10.1 max 14.1 stddev 0.1  Connect time [ms]: avg 0.2 min 0.1 max 0.8 stddev 0.0    Request rate: 9910.5 req/s (0.1 ms/req)  Request size [B]: avg 35.9 min 28.0 max 44.0 stddev 4.8    Response rate: 9910.5 rsp/s (0.1 ms/rsp)  Response size [B]: avg 8.0 min 8.0 max 8.0 stddev 0.0  Response time [ms]: avg 0.2 min 0.1 max 13.4 stddev 0.00  Response time [ms]: p25 1.0 p50 1.0 p75 1.0  Response time [ms]: p95 1.0 p99 1.0 p999 1.0  Response type: stored 10000 not_stored 0 exists 0 not_found 0  Response type: num 0 deleted 0 end 0 value 0  Response type: error 0 client_error 0 server_error 0    Errors: total 0 client-timo 0 socket-timo 0 connrefused 0 connreset 0  Errors: fd-unavail 0 ftab-full 0 addrunavail 0 other 0    CPU time [s]: user 0.64 system 0.35 (user 63.6% system 35.1% total 98.7%)  Net I/O: bytes 428.7 KB rate 424.8 KB/s (3.5*10^6 bps)

项目主页：http://www.open-open.com/lib/view/home/1363246880703