ABOUT PROGRAM:
libevent_high_connection
This is only test libevent can hold how much connection,contain client/server

usage:
run client:
./tcp_client 'number_of_connection' 'ip'
if in the same machine don't take 'ip'
run server:
./tcp_server


libevent_rw_bench
This is test single thread read/write bench ,
it only care per second call read/write times,
lievent_rw_bench contain client/server.
This program is very same like 'libevent_high_connection' 
except add some code of read/write.

send/recv data stream(will cost small time,that we need):
client send "'connection_id' | 'ask' | 'time'"
server use client data and calcucate new ask = 'ask' * 'connection_id' % time(NULL)
finished sendback 'ask' to client


usage:
run client:
./tcp_client 'number_of_connection'

run server:
./tcp_server 


ABOUT TEST RESULT:
Single thread server ,use two client at other machine test it can hold more than 100,000 connections

Test read/write on same machine if use [10000,15000] connections client and server read/write speed will faster
if use 50000 connections,speed become slow.

client 50000 
client result:
connected:50000,read:1.15 m/s,taotal handles:27192.40 c/s,per conn handles:speed:0.54c/s
connected:50000,read:1.26 m/s,taotal handles:30000.00 c/s,per conn handles:speed:0.60c/s
connected:50000,read:1.29 m/s,taotal handles:30648.60 c/s,per conn handles:speed:0.61c/s
connected:50000,read:1.22 m/s,taotal handles:28906.60 c/s,per conn handles:speed:0.58c/s
connected:50000,read:1.29 m/s,taotal handles:30723.40 c/s,per conn handles:speed:0.61c/s
connected:50000,read:1.28 m/s,taotal handles:30370.20 c/s,per conn handles:speed:0.61c/s
connected:50000,read:1.29 m/s,taotal handles:30588.80 c/s,per conn handles:speed:0.61c/s

server result:
conntected:50000,read speed:30808.00 c/s,read bytes speed:0.76 m/s
conntected:50000,read speed:30270.60 c/s,read bytes speed:0.75 m/s
conntected:50000,read speed:31004.40 c/s,read bytes speed:0.76 m/s
conntected:50000,read speed:29185.80 c/s,read bytes speed:0.72 m/s
conntected:50000,read speed:30620.80 c/s,read bytes speed:0.75 m/s
conntected:50000,read speed:29801.60 c/s,read bytes speed:0.73 m/s
conntected:50000,read speed:29028.60 c/s,read bytes speed:0.72 m/s

client 15000
client result:
connected:15000,read:1.33 m/s,taotal handles:31227.00 c/s,per conn handles:speed:2.08c/s
connected:15000,read:1.39 m/s,taotal handles:32612.00 c/s,per conn handles:speed:2.17c/s
connected:15000,read:1.39 m/s,taotal handles:32680.40 c/s,per conn handles:speed:2.18c/s
connected:15000,read:1.47 m/s,taotal handles:34521.40 c/s,per conn handles:speed:2.30c/s
connected:15000,read:1.36 m/s,taotal handles:31945.80 c/s,per conn handles:speed:2.13c/s
connected:15000,read:1.42 m/s,taotal handles:33311.80 c/s,per conn handles:speed:2.22c/s
connected:15000,read:1.35 m/s,taotal handles:31692.20 c/s,per conn handles:speed:2.11c/s
connected:15000,read:1.40 m/s,taotal handles:32796.60 c/s,per conn handles:speed:2.19c/s

server result:
conntected:15000,read speed:33852.40 c/s,read bytes speed:0.82 m/s
conntected:15000,read speed:33355.20 c/s,read bytes speed:0.81 m/s
conntected:15000,read speed:32320.20 c/s,read bytes speed:0.79 m/s
conntected:15000,read speed:31967.80 c/s,read bytes speed:0.78 m/s
conntected:15000,read speed:32895.80 c/s,read bytes speed:0.80 m/s
conntected:15000,read speed:31434.80 c/s,read bytes speed:0.76 m/s
conntected:15000,read speed:30697.20 c/s,read bytes speed:0.75 m/s
conntected:15000,read speed:32139.80 c/s,read bytes speed:0.78 m/s