python multiprocessing&threading

multiprocessing&threading心得

环境:python3.7.0

系统信息:

image.png

Code:

import time
from multiprocessing import Process
import threading

def Solve(n:int)->int:

    def Factorial(n:int)->int:
        factorial=1
        for i in range(1,n+1):
            factorial*=I
        return factorial

    def Sum(n:int)->int:
        sum=0
        for i in str(n):
            sum+=int(i)
        return sum
    sum=0
    for i in range(1,n+1):
        sum+=Sum(Factorial(i))

    return sum

def useProcess():
    start=time.time()
    Process(target=Solve,args=(10000,)).start()
    end=time.time()
    return end-start

def useNone():
    start=time.time()
    Solve(10000)
    end=time.time()
    return end-start

def useThread():
    start=time.time()
    threading.Thread(target=Solve,args=(10000,)).start()
    end=time.time()
    return end-start

def main():
    print("useProcess:", useProcess(), 's')
    threading.Event().wait(10)

    print("useThread:",useThread(),'s')
    threading.Event().wait(10)

    print("useNone:",useNone(),'s')

if __name__ == '__main__':
    main()

运行结果:

屏幕快照 2018-08-13 21.03.53.png

Thread:

threading库

Process:

multiprocessing库

不开线程与进程与开了线程或进程的差了至少35k倍