m.py

from multiprocessing import Pool,Process

def f(x):
    return x*x
    
def f2(x):
    return [i*i for i in x]

num = 10000000

'''
2.22 real         3.70 user         0.44 sys
'''
p1 = Process(target=f2, args=(xrange(num/2),))
p1.start()
p2 = Process(target=f2, args=(xrange(num/2,num),))
p2.start()
p1.join()
p2.join()

'''
8.40 real        12.86 user         1.97 sys
'''
# p = Pool(2)
# p.map(f,xrange(num))

'''
6.41 real         6.03 user         0.34 sys
'''
# map(f,xrange(num))


'''
5.66 real         5.17 user         0.45 sys
'''
# [i*i for i in xrange(num)]