Python 多线程与多进程 – Pancake's Personal Website

python多线程因为GIL锁的原因可以说是假的，但是多进程是可以使用多核 cpu。

测试代码如下：

from threading import Thread

def loop1():
    a = 0
    while 1:
        a += 1

def loop2(a):
    while 1:
        a += 1

for i in range(3):
    t = Thread(target=loop1())
    t.start()

for i in range(3):
    t = Thread(target=loop2(), args=(1,))
    t.start()

from threading import Thread

def loop1():

a = 0

while 1:

a += 1

def loop2(a):

while 1:

a += 1

for i in range(3):

t = Thread(target=loop1())

t.start()

for i in range(3):

t = Thread(target=loop2(), args=(1,))

t.start()

from multiprocessing import Process, Pool

def loop1():
    a = 0
    while 1:
        a += 1

def loop2(a):
    while 1:
        a += 1

pool = Pool(processes=6)

for i in range(3):
    pool.apply_async(loop1)

for i in range(3):
    pool.apply_async(loop2, args=(1,))

pool.close()
pool.join()

from multiprocessing import Process, Pool

def loop1():

a = 0

while 1:

a += 1

def loop2(a):

while 1:

a += 1

pool = Pool(processes=6)

for i in range(3):

pool.apply_async(loop1)

for i in range(3):

pool.apply_async(loop2, args=(1,))

pool.close()

pool.join()

测试结果如下：

结果：我们可以看到 threading 多线程库只可以跑满一核 cpu，但是 multiprocessing 多进程库可以跑满 cpu

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