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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🧡 Nargis Kosimova, Director of the “Ekolog” Public Association, has been awarded the “Mo‘tabar Ayol” badge
In accordance with the Decree of the President of the Republic of Uzbekistan dated February 2, 2018, No. PF-5325, “On measures to fundamentally improve activities in the field of supporting women and strengthening the family institution,” the “Mo‘tabar Ayol” badge was established.
This award is given to women who have shown activity and initiative in public and state life, contributed through their effective work to the stability and prosperity of families, the protection of motherhood and childhood, and have set an exemplary example in raising healthy and well-rounded generations in the spirit of patriotism and loyalty to the ideals of independence, promoting moral and ethical values locally, and broadly spreading national values.
The “Mo‘tabar Ayol” badge is presented by the Women’s Committee of Uzbekistan on the eve of International Women’s Day, March 8.
🌿 The team of the “Ekolog” Public Association sincerely congratulates Nargis Kosimova on receiving this prestigious award!
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Congratulations to the fourteen train driver trainees who have successfully completed their training!
January 24, 2024(EDR); During their one year training period, the trainees have successfully finished their theoretical and practical training. That provided by the Ethiopian-Djibouti Railway Capacity Building program’s fourth round.
Today, they took their Ministry of Transport and Logistics qualification exam, and now one step closer to obtaining their licenses and starting their careers as train drivers.
We are incredibly proud of their hard work and commitment, and we wish them all the best in their future endeavors!
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Hurmatli ommaviy axborot vositalari xodimlari, sizlarni "27-iyun – Matbuot va ommaviy axborot vositalari xodimlari kuni” munosabati bilan tabriklaymiz.
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Kasb bayramingiz muborak boʻlsin!
Hurmat bilan,
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