什么是进程池_进程池的实现

from multiprocessing import Process
import time

#计算密集任务
def task1():
    sum = 1
    for i in range(10000000):
        sum *=i

def task2():
    sum = 1
    for i in range(10000000):
        sum *=i

def task3():
    sum = 1
    for i in range(10000000):
        sum *=i

def task4():
    sum = 1
    for i in range(10000000):
        sum *=i

def task5():
    sum = 1
    for i in range(10000000):
        sum *=i

def task6():
    sum = 1
    for i in range(10000000):
        sum *=i

if __name__ == '__init__':
    # 开始时间
    st_time = time.time()
    # 多进程情况下
    p1 = Process(target = task1)
    p2 = Process(target = task2)
    p3 = Process(target = task3)
    p4 = Process(target = task4)
    p5 = Process(target = task5)
    p6 = Process(target = task6)
    p1.start()
    p2.start()
    p3.start()
    p4.start()
    p5.start()
    p6.start()

    p1.join()
    p2.join()      
    p3.join()
    p4.join()
    p5.join()
    p6.join()
    print(time.time()-st_time)    
 '''
1.05321354643464
'''

from threading import Thread
import time

#计算密集任务
def task1():
    time.sleep(3)

def task2():
    time.sleep(3)

def task3():
    time.sleep(3)

def task4():
    time.sleep(3)

def task5():
    time.sleep(3)

def task6():
    time.sleep(3)

if __name__ == '__main__':
    #开始时间
    st_time = time.time()
    #多线程情况下
    t1 = Thread(target = task1)  
    t2 = Thread(target = task2)
    t3 = Thread(target = task3)
    t4 = Thread(target = task4)
    t5 = Thread(target = task5)
    t6 = Thread(target = task6)
    t1.start()
    t2.start()
    t3.start()
    t4.start()
    t5.start()
    t6.start()
    t1.join()
    t2.join()
    t3.join()
    t4.join()
    t5.join()
    t6.join()
    print(time.time - st_time)
    '''
    3.0035946873164
    '''