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Изворен канал @pythonotes · Post #425 · 20 апр.
Недавно делал быстрый прототип асинхронного приложения в котором требовалось вызывать много синхронного кода. Да, я знаю, что это не лучший дизайн, но нужно было быстрое решение на один процесс и без очередей. Поэтому я выполнял код в потоках. Выглядело это примерно так: from fastapi.concurrency import run_in_threadpool async def execute(data: DataRequest) -> DataResponse: try: result = await run_in_threadpool(sync_function, data) return DataResponse(data=result) except Exception as e: return DataResponse( error=str(e), success=False, ) В общем работает нормально. Для всех вызовов под капотом используется общий тредпул, всё работает предсказуемо. Но потребовалось изменить количество запускаемых в пуле потоков (по умолчанию создается 40 воркеров). Так как дело происходит с FastAPI, делается это через lifespan используя настройки anyio: import anyio @asynccontextmanager async def lifespan(app: FastAPI): limiter = anyio.to_thread.current_default_thread_limiter() limiter.total_tokens = 100 yield # если вдруг нужно вернуть обратно limiter.total_tokens = 40 Зачем менять количество воркеров? - уменьшить, если оперативки мало (один тред занимает ~8мб) - увеличить чтобы выдержать нагрузку Если есть предложения получше при тех же вводных - предлагайте😉 #async
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Пребарај: #earning
@trading_pit_signal · Post #34081 · 08.02.2024 г., 09:03
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@trading_pit_signal · Post #34040 · 07.02.2024 г., 13:23
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@trading_pit_signal · Post #33861 · 05.02.2024 г., 10:58
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@trading_pit_signal · Post #33859 · 05.02.2024 г., 10:24
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@trading_pit_signal · Post #33855 · 05.02.2024 г., 10:03
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@trading_pit_signal · Post #33816 · 04.02.2024 г., 12:09
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@trading_pit_signal · Post #33803 · 03.02.2024 г., 12:50
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@trading_pit_signal · Post #33796 · 02.02.2024 г., 20:50
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@trading_pit_signal · Post #33795 · 02.02.2024 г., 16:55
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@trading_pit_signal · Post #33627 · 01.02.2024 г., 03:07
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@trading_pit_signal · Post #33624 · 01.02.2024 г., 00:40
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@trading_pit_signal · Post #33540 · 31.01.2024 г., 07:49
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