多進程(multiprocessing)

參考：

1. 多進程概念

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. 多進程

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(線程)，待p1,p2運行結束后，caller程序(線程)繼續(xù)運行

p1.join()

p2.join()

time.sleep(1)

print()

print('End')

2. 進程間通信看文檔

多線程(multithreading)， 留坑

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