# time_multiprocessing.py

# time_multiprocessing.py

import time
from multiprocessing import Pool

def cpu_bound(number):
    return sum(i * i for i in range(number))

def find_sums(numbers):
    for number in numbers:
        cpu_bound(number)

def find_sums_mp(numbers):
    pool = Pool(processes=4)
    pool.map(cpu_bound, numbers)
    pool.terminate()

def find_sums_mp_8(numbers):
    pool = Pool(processes=8)
    pool.map(cpu_bound, numbers)
    pool.terminate()

if __name__ == "__main__":
    numbers = [1280*800*2 + x for x in range(20)]

    start_time = time.time()
    find_sums(numbers)
    duration = time.time() - start_time
    print "Duration", duration, "seconds"

    start_time = time.time()
    find_sums_mp(numbers)
    duration = time.time() - start_time
    print "Duration", duration, "seconds"

    start_time = time.time()
    find_sums_mp_8(numbers)
    duration = time.time() - start_time
    print "Duration", duration, "seconds"