由于GIL的存在，python中的多线程其实并不是真正的多线程，如果想要充分使用多核CPU的资源，在python中大部分情况使用多进程。

 

from multiprocessing import Processimport timedef f(name):    time.sleep(1)    print('hello', name,time.ctime())if __name__ == '__main__':    p_list=[]    for i in range(3):        p = Process(target=f, args=('alvin',))        p_list.append(p)        p.start()    for i in p_list:        i.join()    print('end')from multiprocessing import Processimport timeclass MyProcess(Process):    # def __init__(self):    #     super(MyProcess, self).__init__()    #     #self.name = name    def run(self):        time.sleep(1)        print ('hello', self.name,time.ctime())if __name__ == '__main__':    p_list=[]    for i in range(3):        p = MyProcess()        p.daemon=True        p.start()        p_list.append(p)    # for p in p_list:    #     p.join()    print('end')