多线程vs多进程

多线程vs多进程

计算密集型

from threading import Thread
from multiprocessing import Process
import time
#计算密集型
def work1():
    res=0
    for i in range(100000000):
        res*=i
if __name__ == '__main__':
    t_list=[]
    start=time.time()
    for i in range(4):
        # t=Thread(target=work1)
        t=Process(target=work1)
        t_list.append(t)
        t.start()
    for t in t_list:
        t.join()
    end=time.time()
    # print('多线程',end-start) #多线程 20.864253044128418

    print('多进程',end-start) #多进程 8.076735258102417

io密集型

from multiprocessing import Process
from threading import Thread
import time
#计算密集型
def work1():
   x=1+1
   time.sleep(5)

if __name__ == '__main__':
    t_list=[]
    start=time.time()
    for i in range(4):
        t=Thread(target=work1)
        # t=Process(target=work1)
        t_list.append(t)
        t.start()
    for t in t_list:
        t.join()
    end=time.time()
    print('多线程',end-start) #多线程 5.002452373504639


    # print('多进程',end-start) #多进程 5.937068939208984