【Python】多进程与多线程的选择

# 对于计算密集型的任务,应该使用多进程(发挥CPU优势)

# 对于IO密集型的任务,应该采用多线程

from multiprocessing import Process
from threading import Thread
import threading
import os, time


def work(work_type):
    if work_type == 2:
        time.sleep(2)
    elif work_type == 1:
        res = 0
        for i in range(100000000):
            res *= i
        print('stop')


if __name__ == '__main__':
    l = []
    work_type = 2
    print(os.cpu_count())
    start = time.time()
    for i in range(400):
        # p = Process(target=work, kwargs={'work_type': work_type})      # count 3.99s  io 12.27s
        p = Thread(target=work, kwargs={'work_type': work_type})     # count 15s    io 2.0039s
        l.append(p)
        p.start()

    for p in l:
        p.join()

    stop = time.time()
    print(stop-start)