[Tutor] threads

[John Moylan]

I found the following somewhere on the web a while back. 
I don't know who to attribute it too, but it is the best
starting point I found for programming threads in Python.
here goes:


#!/usr/bin/env python
import urllib, time
import threading

retrieveDoc = 1
numPings = 20
numThreads = 5

url = 'http://localhost/'



class ping ( threading.Thread ) :
    def __init__ ( self, url, numPings, retrieveDoc=1 ) :
        self.url = url
        self.numPings = numPings
        self.retrieveDoc = retrieveDoc
        threading.Thread.__init__(self)

    def run ( self ) :
        StartTime = time.time()
        for i in range(self.numPings):
            page = urllib.urlopen ( self.url )
            if self.retrieveDoc:
                page.read()
            page.close()
        EndTime = time.time()
        self.TotalTime = EndTime - StartTime



if __name__ == '__main__' :
    threadList = []
    for i in range(numThreads) :
        thread = ping( url, numPings, retrieveDoc )
        threadList.append ( thread )

    StartTime = time.time()
    for thread in threadList :
        thread.start()

    while threading.activeCount() > 1 :
        print ".",
        time.sleep(1)
    EndTime = time.time()
    TotalTime = EndTime - StartTime
    print

    TotalPings = 0
    ThreadTime = 0
    for thread in threadList :
        TotalPings = TotalPings + thread.numPings
        ThreadTime = ThreadTime + thread.TotalTime

    PingAvg = TotalPings / TotalTime
    ResponseAvg = ThreadTime / TotalPings

    print "Threads: ", numThreads
    print "Pings:", TotalPings
    print "Total time:", TotalTime
    print "Pings per second:", PingAvg
    print "Average response time (secs):", ResponseAvg



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