Client program parameter:
parameter1 : IP/port
parameter2: sendMode, 0 for testing API mode, 1 for testing throughput, default is 1
parameter3: T, for testing throughput mode, 12.5 indicates that send throughput is 8000/s, default is 12.5
parameter4: num of users in this client, default is 100000
parameter5: first user ID in this client, default is 0
parameter6: num of total users for the server, default is 100000