multiprocess_demo.py

import time
import multiprocessing

def timerecord(func):
    def wrapper(*args, **kwargs):
        start = time.time()
        func(*args, **kwargs)
        end   = time.time()
        print 'COST: {}'.format(end - start)
    return wrapper

def fib(n):
    if n<= 2:
        return 1
    return fib(n-1) + fib(n-2)

@timerecord
def nomultiprocess():
    fib(20)
    fib(20)

@timerecord
def hasmultiprocess():
    jobs = []
    for i in range(2):
        p = multiprocessing.Process(target=fib, args=(20,))
        p.start()
        jobs.append(p)
    for p in jobs:
        p.join()

if __name__ == '__main__':
    nomultiprocess()
    hasmultiprocess()