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
📖Title : Fearless
✍️Author : Lauren Roberts
⭐️Rating : 4.22/5 (Goodreads)
📆Published : Apr 08, 2025
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Summary:Fearless by Lauren Roberts is the gripping conclusion to The Powerless Trilogy, a young adult romantasy series. The story follows Paedyn Gray, an Ordinary in a world dominated by the powerful Elites, as she returns to the Kingdom of Ilya. Facing a life-altering decision, Paedyn must navigate political intrigue, personal betrayals, and the complexities of love. Her relationship with Kai Azer, an Elite and her former adversary, intensifies amidst the kingdom's turmoil. As Paedyn confronts trials that test her courage and resilience, she challenges societal norms and redefines strength. Roberts weaves a tale of empowerment, loyalty, and the enduring power of love in a fractured world.
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#fiction#fantasy#romantasy#youngadult@Bookslibraryofficial@free_novellas@the_ancient_library
📖Title : Enigma
✍️Author : RuNyx
⭐️Rating : 3.91/5 (Goodreads)
📆Published : Apr 29, 2025
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Summary:Enigma by RuNyx is a steamy dark academia romance that follows Salem Salazar, the black sheep of a wealthy family, as she enters Mortimer University to uncover the truth behind her sister's mysterious death. Obsessed with death and driven by secrets, Salem is soon entangled with Cazimir van der Waal—a chaotic, brooding artist and teaching assistant with a hidden past. Their intense, rivals-to-lovers relationship unfolds amid secret societies, missing girls, and deadly mysteries on campus. As danger closes in, passion ignites between fire and ice. *Enigma* is a twisted, suspenseful tale of obsession, love, and peril set in an academic underworld.
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#fiction#darkromance#fantasy#romantasy#darkacademia@Bookslibraryofficial@free_novellas@the_ancient_library
📖Title : Blackthorn
✍️Author : J.T. Geissinger
⭐️Rating : 4.03/5 (Goodreads)
📆Published : Nov 04, 2025
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Summary:Blackthorn follows Maven Blackthorn as she returns to her haunted hometown after her grandmother’s funeral—only to discover the body has mysteriously vanished. Caught in a generations-old feud between the Blackthorns and the powerful Croft family, Maven is forced to confront Ronan Croft, her first love and the son of her mother’s suspected killer. Their dangerous chemistry resurfaces as whispers of occult rituals, buried secrets, and horrific betrayals emerge. As Maven digs deeper, she uncovers a terrifying truth that threatens everyone she loves. In a town where the dead refuse to rest, love becomes both a weapon and a deadly curse.
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#romance#gothic#romantasy#fantasy#paranormal@Bookslibraryofficial@free_novellas@eternalmantra