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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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@dzdigital3 · Post #18959 · 03.09.2025 г., 20:52
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@dzdigital3 · Post #18958 · 03.09.2025 г., 20:52
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@dzdigital3 · Post #18957 · 02.09.2025 г., 22:23
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@dzdigital3 · Post #18919 · 27.08.2025 г., 12:21
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@dzdigital3 · Post #18909 · 25.08.2025 г., 14:52
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@dzdigital3 · Post #18905 · 24.08.2025 г., 14:19
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@dzdigital3 · Post #18903 · 23.08.2025 г., 14:58
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@dzdigital3 · Post #18901 · 22.08.2025 г., 10:05
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@dzdigital3 · Post #18900 · 21.08.2025 г., 22:13
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@dzdigital3 · Post #18895 · 20.08.2025 г., 18:13
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@dzdigital3 · Post #18891 · 19.08.2025 г., 15:28
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@dzdigital3 · Post #18890 · 18.08.2025 г., 12:08
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