#!/usr/bin/env python3

import multiprocessing
import threading
import time
import random

def hello(thid, n):
    i = 0
    res = 0
    while i < n:
        res += i
        i += 1
    print("%d. result: %d"%(thid, res))

def test_process(n):
    tlist = []
    for i in range(4):
        t = multiprocessing.Process(target=hello, args=(i,n,))
        t.start()
        tlist.append(t)

    for t in tlist:
        t.join()

def test_thread(n):
    tlist = []
    for i in range(4):
        t = threading.Thread(target=hello, args=(i,n,))
        t.start()
        tlist.append(t)

    for t in tlist:
        t.join()

def test_sima(n):
    for i in range(4):
        hello(i,n)

if __name__ == '__main__':
    n = 3000*1000
    s = time.time()
    test_thread(n)
    print("Multi-Thread: %.3fs" % (time.time() - s))

    s = time.time()
    test_process(n)
    print("Multi-Process: %.3fs" % (time.time() - s))

    s = time.time()
    test_sima(n)
    print("Single: %.3fs" % (time.time() - s))

    print("Done!")