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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Applications are now open for InteRussia fellowships⭕️
InteRussia is a fellowship program for young professionals worldwide, implemented by the Gorchakov Fund in partnership with leading Russian universities, expert centers, and industry partners.
⭕️ The program offers hands-on professional experience in Russia, direct engagement with top experts, and the opportunity to become part of a global professional community. More than 500 participants from 70 countries have already completed InteRussia fellowships — now it’s your turn to join.
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Applications are now open for InteRussia fellowships⭕️
InteRussia is a fellowship program for young professionals worldwide, implemented by the Gorchakov Fund in partnership with leading Russian universities, expert centers, and industry partners.
⭕️ The program offers hands-on professional experience in Russia, direct engagement with top experts, and the opportunity to become part of a global professional community. More than 500 participants from 70 countries have already completed InteRussia fellowships — now it’s your turn to join.
Which fellowships can you apply for?
⭕️International Relations (all over the world)
⭕️Oriental Studies (post-Soviet countries, the Middle East, and North Africa)
⭕️Archeologists (post-Soviet countries, the Middle East, North Africa, India, and Pakistan)
⭕️Journalism (South Asia)
⭕️Journalism (the Middle East and North Africa)
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⭕️Russian Studies (all over the world)
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⭕️Electric Power (the Middle East and Africa)
⭕️Energy (Latin America)
⭕️Theatre Arts (BRICS+ countries)
⭕️ More details and application guidelines are available at interussia.com.
The InteRussia fellowships are implemented with the support of the Presidential Grants Foundation, Rossotrudnichestvo, and the Ministry of Education of Russia.
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