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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😜 Best Funny Video @Funnys
😄Consider
➖➖➖➖➖➖
🔘 The verb, consider can mean spend time to think, or think about something
🔜 I'm going to take some time to consider, then I'll tell you my decision.
🔜I'm considering how we can best use our time.
🔘 Consider can have a similar meaning to 'take into account' to say that somethng is important when making a decision or judgement.
🔜 She's learnt so much, considering how late she started the course.
🔘 Consider can be used with an object and an adjective or noun to describe what we think something or someone is like.
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🆕 Crypto News @Money
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▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
📰Colorado Lawmakers Consider Bill Allowing Older Adults to Opt Out of Jury Duty in State Courts
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via Daily Political Press
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📰Colorado Lawmakers Consider Bill Allowing Older Adults to Opt Out of Jury Duty in State Courts
🔗https://dailycoloradonews.com/colorado-lawmakers-consider-bill-older-adults-opt-out-jury-duty/?utm_source=telegram&utm_medium=social&utm_campaign=zimm-distribute
via Daily Political Press
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