该脚本用于从指定的文件中读取数据包，然后在特定的时间内，向tcp服务器发送指定数量的数据包，以测试服务的性能
#!/usr/bin/python
import socket
import sys
import time
f = open('./send.dat', 'r')
data = f.read()
#数据包数量
num = 12
#发送包的持续时间
howlong=60.0
minInterval = (float)(howlong / num)
lastTimeCalled = time.time()
accDelay=0.0
startTime=time.time()
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('127.0.0.1', 4500))
while num > 0:
s.send(data)
#rvcdata = s.recv(2048)
#print(rvcdata)
num -= 1
elapsed = time.time() - lastTimeCalled
curDelay = accDelay-(minInterval-elapsed)
print curDelay
if(curDelay < 0):
time.sleep(-curDelay)
accDelay = 0.0
else:
accDelay = curDelay
lastTimeCalled = time.time()
#sys.exit(0)
s.close()
timeCost = time.time()-startTime
print("time cost:%f" %timeCost)
