多进程并行以及串行

多进程并行

code

import time
from multiprocessing import Process
 
 
def f(name):
    print('hello', name)
    time.sleep(1)
 
if __name__ == '__main__':
    p_lst = []
    for i in range(5):
        p = Process(target=f, args=('bob',))
        p.start()
        p_lst.append(p)
        #p.join()
    x=[p.join() for p in p_lst]
    print('父进程在执行')

outputs

macname@MacdeMacBook-Pro py % python3 cccccc.py
hello bob
hello bob
hello bob
hello bob
hello bob
父进程在执行
macname@MacdeMacBook-Pro py %
 

 

 

多进程串行

code

import time
from multiprocessing import Process
 
def f(name):
    print('hello', name)
    time.sleep(1)
 
if __name__ == '__main__':
    p_lst = []
    for i in range(5):
        p = Process(target=f, args=('bob',))
        p.start()
        p_lst.append(p)
        p.join()
    #x=[p.join() for p in p_lst]
    print('父进程在执行')

outputs

macname@MacdeMacBook-Pro py % python3 cccccc.py
hello bob
hello bob
hello bob
hello bob
hello bob
父进程在执行
macname@MacdeMacBook-Pro py %