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#!/usr/bin/env python
"""
A simple example of parallel computation using a map and the create function.
NOTE: We could use the with statement in the innermost loop to package the
NOTE: try...finally functionality.
"""
import pprocess
import time
#import random
# Array size and a limit on the number of processes.
N = 10
limit = 10
delay = 1
# Main program.
if __name__ == "__main__":
t = time.time()
# Initialise the results using a map with a limit on the number of
# channels/processes.
results = pprocess.Map(limit=limit)
# Perform the work.
# NOTE: Could use the with statement in the loop to package the
# NOTE: try...finally functionality.
print "Calculating..."
for i in range(0, N):
for j in range(0, N):
ch = results.create()
if ch:
try: # Calculation work.
#time.sleep(delay * random.random())
time.sleep(delay)
ch.send(i * N + j)
finally: # Important finalisation.
pprocess.exit(ch)
# Show the results.
for i in range(0, N):
for result in results[i*N:i*N+N]:
print result,
print
print "Time taken:", time.time() - t
# vim: tabstop=4 expandtab shiftwidth=4
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