1 #!/usr/bin/env python 2 3 """ 4 A simple example of serial computation using map-style processing. 5 See the simple_pmap.py program for the corresponding parallel version. 6 """ 7 8 import time 9 #import random 10 11 # Array size. 12 13 N = 10 14 delay = 1 15 16 # Work function. 17 18 def calculate(t): 19 20 "A supposedly time-consuming calculation on 't'." 21 22 i, j = t 23 #time.sleep(delay * random.random()) 24 time.sleep(delay) 25 return i * N + j 26 27 # Main program. 28 29 if __name__ == "__main__": 30 31 t = time.time() 32 33 # Initialise an array. 34 35 sequence = [] 36 for i in range(0, N): 37 for j in range(0, N): 38 sequence.append((i, j)) 39 40 # Perform the work. 41 42 results = map(calculate, sequence) 43 44 # Show the results. 45 46 for i in range(0, N): 47 for result in results[i*N:i*N+N]: 48 print result, 49 print 50 51 print "Time taken:", time.time() - t 52 53 # vim: tabstop=4 expandtab shiftwidth=4
