from multiprocessing import Pool
import time
import numpy

def takeuptime(ntrials):
    for ii in xrange(ntrials):
        junk = numpy.std(numpy.random.randn(1e5))
    return junk

if __name__ == "__main__":
    start = time.time()
    map(takeuptime, [500, 500])
    print "Serial time: %f" % (time.time() - start)

    start = time.time()
    pool = Pool(processes=2)
    pool.map(takeuptime, [500, 500])
    print "Parallel time: %f" % (time.time() - start)