Usage: 
benchmark [-h <host>] [-p <port>] [-c <clients>] [-n <requests]> [-r] [-k] [-u]
 -h <host> Server ip (default 127.0.0.1)
 -p <port> Server port (default 5113)
 -c <clients> Number of parallel connections (default 5)
 -n <requests> Total number of requests (default 50)
 -k keep alive or reconnect (default is reconnect)
 -r re-encode sendbuf per request (default is no encode)
 -u benchmark with udp protocol(default is tcp)

for example:
dc@ubuntu:~/benchmark$ ./benchmark -c 50 -n 1000 -p 80  -k
keepAlive is open
50 parallel clients
1000 completed in 0 seconds
78.6% <= 1 milliseconds
100% <= 1 milliseconds
1000 requests are neend
1035 requests are sended
0 clients are timeout
999 clients are reset
50 clients are created
21 total milliseconds used
47619 requests per second

How to make a test use case?
1.mkdir module
2.create a cpp file that include "module.h" , overload the encodeRequest and decodeResponse function.
/*
* encode success return the data len
* encode fail return -1
*/
int encodeRequest(char* data, int maxLen);

/*
* decode success return 0
* decode fail return -1
* not a complete package(tcp is stream), need wait more data return 1
*/
int decodeResponse(char* data, int len);