Created
September 28, 2021 16:17
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Python simple multiprocessing + asyncio - one event loop per process
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from multiprocessing import Process | |
import asyncio as aio | |
import coloredlogs, logging | |
import time | |
PROCESSES = 2 | |
COROUTINES_PER_PROCESS = 5 | |
class Multitasker: | |
def __init__(self): | |
logger.info('Running multitasker') | |
def run(self): | |
logger.info(f'Spawning {PROCESSES} processes') | |
processes = [Process(target=self.process, daemon=True) for p in range(PROCESSES)] | |
[p.start() for p in processes] | |
[p.join() for p in processes] | |
def process(self): | |
logger.info(f" - process started, starting {COROUTINES_PER_PROCESS} coroutines") | |
loop = aio.new_event_loop() | |
aio.set_event_loop(loop) | |
tasks = [aio.ensure_future(self.main_coroutine(n_coroutine)) for n_coroutine in range(COROUTINES_PER_PROCESS)] | |
loop.run_until_complete(aio.wait(tasks)) | |
async def main_coroutine(self, n_coroutine): | |
logger.info(f' - running coroutine {n_coroutine} waiting {n_coroutine + 1} secs') | |
await aio.sleep(n_coroutine + 1) | |
logger.info(f' - done') | |
if __name__ == '__main__': | |
logger = logging.getLogger('log') | |
logger.setLevel(logging.DEBUG) | |
coloredlogs.install(logger=logger, fmt='%(asctime)s [%(process)d] %(levelname)s %(message)s') | |
mt = Multitasker() | |
mt.run() |
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Output :
multitasker | 2021-09-28 16:14:25 [1] INFO Running multitasker
multitasker | 2021-09-28 16:14:25 [1] INFO Spawning 2 processes
multitasker | 2021-09-28 16:14:25 [7] INFO - process started, starting 5 coroutines
multitasker | 2021-09-28 16:14:25 [8] INFO - process started, starting 5 coroutines
multitasker | 2021-09-28 16:14:25 [7] INFO - running coroutine 0 waiting 1 secs
multitasker | 2021-09-28 16:14:25 [7] INFO - running coroutine 1 waiting 2 secs
multitasker | 2021-09-28 16:14:25 [7] INFO - running coroutine 2 waiting 3 secs
multitasker | 2021-09-28 16:14:25 [7] INFO - running coroutine 3 waiting 4 secs
multitasker | 2021-09-28 16:14:25 [7] INFO - running coroutine 4 waiting 5 secs
multitasker | 2021-09-28 16:14:25 [8] INFO - running coroutine 0 waiting 1 secs
multitasker | 2021-09-28 16:14:25 [8] INFO - running coroutine 1 waiting 2 secs
multitasker | 2021-09-28 16:14:25 [8] INFO - running coroutine 2 waiting 3 secs
multitasker | 2021-09-28 16:14:25 [8] INFO - running coroutine 3 waiting 4 secs
multitasker | 2021-09-28 16:14:25 [8] INFO - running coroutine 4 waiting 5 secs
multitasker | 2021-09-28 16:14:26 [8] INFO - done
multitasker | 2021-09-28 16:14:26 [7] INFO - done
multitasker | 2021-09-28 16:14:27 [8] INFO - done
multitasker | 2021-09-28 16:14:27 [7] INFO - done
multitasker | 2021-09-28 16:14:28 [7] INFO - done
multitasker | 2021-09-28 16:14:28 [8] INFO - done
multitasker | 2021-09-28 16:14:29 [7] INFO - done
multitasker | 2021-09-28 16:14:29 [8] INFO - done
multitasker | 2021-09-28 16:14:30 [7] INFO - done
multitasker | 2021-09-28 16:14:30 [8] INFO - done