多进程(multiprocessing)

参考：

1. https://docs.python.org/3.6/library/multiprocessing.html

1. 多进程概念

multiprocessing is a package that supports spawning processes using an API similar to the threading module. The multiprocessing package offers both local and remote concurrency, effectively side-stepping the Global Interpreter Lock by using subprocesses instead of threads. Due to this, the multiprocessing module allows the programmer to fully leverage multiple processors on a given machine. It runs on both Unix and Windows.

例子1. 多进程

from multiprocessing import Process

import os

import time 

def info(title):

    print(title)

    print('module name:', __name__)

    print('parent process:', os.getppid())

    print('process id:', os.getpid())

    print()

def f(name):

    info('\033[31;1mfunction f\033[0m')

    print('hello', name)

if __name__ == '__main__':

    info('\033[32;1mmain process line\033[0m')

    p1 = Process(target=f, args=('Allen',))

    p1.start()

    p2 = Process(target=f, args=('Joyce',))

    p2.start()

    #把p1,p2 join到caller程序（线程），待p1,p2运行结束后，caller程序（线程）继续运行

    p1.join()

    p2.join()

    time.sleep(1)

    print()

    print('End')

2. 进程间通信看文档

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多线程(multithreading)， 留坑