파이썬[Python]: multiprocessing - Process 클래스

파이썬(Phthon): multiprocessing 모듈 - Process 클래스(class)

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구분되어진 프로세스를 제어하는 클래스입니다.(2가지 방식: 콜러블 객체를 전달, run() 메서드의 오버라이딩)

참고: 프로세스
group: 사용하지 않습니다.
target: run() 메서드에 의해 시행되는 콜러블 객체입니다.
name: 프로세스에 이름을 부여합니다. 기본값은 Process-N, N은 정수
args: target 에 사용되어지는 튜플입니다.
kwargs: target 에 사용되어지는 딕셔너리입니다.
deamon: daemonic process. (백그라운드에서 시행되는 듯...)

※ 형식
class multiprocessing.Process(group=None, target=None, name=None, args=(), kwargs={}, *, daemon=None)

reference
https://docs.python.org/3/library/multiprocessing.html#module-multiprocessing

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/// 예제

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import multiprocessing import datetime import time     def test_multiprocessing(i):     print(f'   ---> {__name__}: test_multiprocessing {i} is started!')     time.sleep(i)     print(f'   {i}: test_multiprocessing - sleep({i}) ---')     print(f'   ---> Time: {datetime.datetime.now().time()}')     def main():     print('---> Time:', datetime.datetime.now().time())     for i in range(1, 4):         m = multiprocessing.Process(target=test_multiprocessing, args=(i,))         m.start()  # new process: __name__ = __mp_main__ when using Windows(Pycharm)                    # Windows does not have fork     print('---> Time:', datetime.datetime.now().time())     print('-' * 50)     if __name__ == '__main__':  # parent process only has __name__ = __main__ when using Windows(Pycharm)     multiprocessing.freeze_support()  # support Windows executable     main()   # ---> Time: 13:34:50.828798 # ---> Time: 13:34:50.849745 # -------------------------------------------------- #    ---> __mp_main__: test_multiprocessing 1 is started! #    ---> __mp_main__: test_multiprocessing 2 is started! #    ---> __mp_main__: test_multiprocessing 3 is started! #    1: test_multiprocessing - sleep(1) --- #    ---> Time: 13:34:51.921100 #    2: test_multiprocessing - sleep(2) --- #    ---> Time: 13:34:52.918703 #    3: test_multiprocessing - sleep(3) --- #    ---> Time: 13:34:53.932210   Colored by Color Scripter

cs

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/// 예제 name

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import multiprocessing import datetime import time     def test_multiprocessing(i):     print(f'   ---> {__name__}: test_multiprocessing {i} is started!')     time.sleep(i)     print(f'   {i}: test_multiprocessing - sleep({i}) ---')     print(f'   ---> Time: {datetime.datetime.now().time()}')     def main():     print('---> Time:', datetime.datetime.now().time())     m = multiprocessing.Process(target=test_multiprocessing, args=(0,))     print('Name:', m.name)     m.start()  # new process: __name__ = __mp_main__ when using Windows(Pycharm)                # Windows does not have fork     print('---> Time:', datetime.datetime.now().time())     print('-' * 50)     if __name__ == '__main__':  # parent process only has __name__ = __main__ when using Windows(Pycharm)     multiprocessing.freeze_support()  # support Windows executable     main()   # ---> Time: 14:13:21.437985 # Name: Process-1 # ---> Time: 14:13:21.449951 # -------------------------------------------------- #    ---> __mp_main__: test_multiprocessing 0 is started! #    0: test_multiprocessing - sleep(0) --- #    ---> Time: 14:13:21.517770     Colored by Color Scripter

cs

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/// 예제 daemon

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import multiprocessing import datetime import time     def test_multiprocessing(i):     print(f'   ---> {__name__}: test_multiprocessing {i} is started!')     time.sleep(i)     print(f'   {i}: test_multiprocessing - sleep({i}) ---')     print(f'   ---> Time: {datetime.datetime.now().time()}')     def main():     print('---> Time:', datetime.datetime.now().time())     m = multiprocessing.Process(target=test_multiprocessing, args=(0,), daemon=True)     m.start()  # new process: __name__ = __mp_main__ when using Windows(Pycharm)                # # Windows does not have fork     print('---> Time:', datetime.datetime.now().time())     print('-' * 50)     if __name__ == '__main__':  # parent process only has __name__ = __main__ when using Windows(Pycharm)     multiprocessing.freeze_support()  # support Windows executable     main()   # ---> Time: 14:15:23.253697 # ---> Time: 14:15:23.264668 # --------------------------------------------------   Colored by Color Scripter

cs

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* 실행환경: Microsoft Windows 10 Homes
* 인터프리터: 파이썬(Python 3.9)

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