python 测试multiprocessing多进程

测试1 multiprocessing函数的调用

# -*- coding: utf-8 -*-
"""
@File    : 20200312_test_multiprocessing.py
@Time    : 2020/3/12 16:38
@Author  : Dontla
@Email   : [email protected]
@Software: PyCharm
"""
import os
import threading
import multiprocessing

# Main
print('Main:', os.getpid())

print('How are you!')


# worker function
def worker(sign, lock):
    lock.acquire()
    print(sign, os.getpid())
    lock.release()


# Multi-thread
# record = []
# lock = threading.Lock()

# Multi-process
record = []
lock = multiprocessing.Lock()

if __name__ == '__main__':
    # for i in range(5):
    #     thread = threading.Thread(target=worker, args=('thread', lock))
    #     thread.start()
    #     record.append(thread)
    #
    # for thread in record:
    #     thread.join()

    # 用multiprocessing调用一下函数就相当于重新导一下包（相当于它自己又开了个python？）
    for i in range(5):
        process = multiprocessing.Process(target=worker, args=('process', lock))
        process.start()
        record.append(process)

    for process in record:
        process.join()

结果：

D:\20191031_tensorflow_yolov3\python\python.exe C:/Users/SIQI/Desktop/test_multiprocessing/20200312_test_multiprocessing.py
Main: 22560
How are you!
Main: 31028
How are you!
Main: 30472
How are you!
Main: 11780
How are you!
process 31028
process 30472
process 11780
Main: 27904
How are you!
Main: 30488
How are you!
process 27904
process 30488

Process finished with exit code 0

测试2 pipe

# -*- coding: utf-8 -*-
"""
@File    : 20200312_测试pipe.py
@Time    : 2020/3/13 9:16
@Author  : Dontla
@Email   : [email protected]
@Software: PyCharm
"""
import multiprocessing as mul


def proc1(pipe):
    pipe.send('hello')
    # print('proc1 rec:', pipe.recv())


def proc2(pipe):
    print('proc2 rec:', pipe.recv())
    # pipe.send('hello, too')


# Build a pipe
pipe = mul.Pipe()
print(len(pipe))  # 2

if __name__ == '__main__':
    # Pass an end of the pipe to process 1
    p1 = mul.Process(target=proc1, args=(pipe[0],))
    # Pass the other end of the pipe to process 2
    p2 = mul.Process(target=proc2, args=(pipe[1],))
    p1.start()
    p2.start()
    p1.join()
    p2.join()

结果：

D:\20191031_tensorflow_yolov3\python\python.exe C:/Users/SIQI/Desktop/test_multiprocessing/20200312_测试pipe.py
2
2
2
proc2 rec: hello

Process finished with exit code 0

测试queue