DN570016307

Subject: Re: Looking for threading tutorial/HOWTO - DN [1]

aahz@netcom.com (Aahz Maruch) - 08 Jan 2000 - comp.lang.python

 In article <m3zougva3q.fsf@havenrock.com>,
 Matt Gushee  <mgushee@havenrock.com> wrote:
 >
 >I would like to learn how to program threads in Python. Or maybe I
 >should say, I'd like to use threads in a Python program, so I need to
 >learn how they work. Can anyone recommend a good online
 >introduction to the subject (I like books but can't afford to buy one
 >just now)? Code examples might be good, too, if they are well commented.

 This following code example is not well-documented, but should be pretty
 easy to follow; it's designed to test a web server with multiple
 clients:

 import urllib, time
 import threading

 retrieveDoc = 1
 numPings = 20
 numThreads = 5

 url = 'http://www.foo.com/'

 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 = pingPing ( 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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