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June 4, 2015 20:03
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Python multiprocessing example
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| import random | |
| import multiprocessing | |
| import time | |
| import logging | |
| logging.basicConfig( | |
| level=logging.DEBUG, | |
| format='(%(processName)-10s) %(message)s', | |
| ) | |
| max_processes = 3 | |
| class WorkerProcess(multiprocessing.Process): | |
| def __init__(self): | |
| super(WorkerProcess, self).__init__() | |
| self.pause = random.randint(5, 10) | |
| self.daemon = True | |
| def run(self): | |
| logging.debug('sleeping %s', self.pause) | |
| time.sleep(self.pause) | |
| logging.debug('ending') | |
| process_count = 0 | |
| while True: | |
| if process_count < max_processes: | |
| p = WorkerProcess() | |
| p.start() | |
| process_count = 0 | |
| for p in multiprocessing.active_children(): | |
| if type(p) is WorkerProcess: | |
| process_count += 1 | |
| if process_count >= max_processes: | |
| time.sleep(1) |
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