多进程 multiprocessing in Python

Simple example

import time
import multiprocessing

start = time.perf_counter()

def do_something():
	print('sleeping 1 second...')
	time.sleep(1)
	print('Done sleeping...')


p1 = multiprocessing.Process(target = do_something)
p2 = multiprocessing.Process(target = do_something)

p1.start()
p2.start()

p1.join()
p2.join()

finish = time.perf_counter()

print(f'Finish in {round(finish-start,2)} seconds(s)')

for循环

import time
import multiprocessing

start = time.perf_counter()

def do_something():
	print('sleeping 1 second...')
	time.sleep(1)
	print('Done sleeping...')

processes = []
for  _ in range(10):
	p = multiprocessing.Process(target = do_something)
	p.start()
	processes.append(p)

for process in processes:
	process.join()

finish = time.perf_counter()

print(f'Finish in {round(finish-start,2)} seconds(s)')

加个参数

import time
import multiprocessing

start = time.perf_counter()

def do_something(seconds):
	print(f'sleeping {seconds} second...')
	time.sleep(seconds)
	print('Done sleeping...')

processes = []
for  _ in range(10):
	p = multiprocessing.Process(target = do_something, args = [2])
	p.start()
	processes.append(p)

for process in processes:
	process.join()

finish = time.perf_counter()

print(f'Finish in {round(finish-start,2)} seconds(s)')