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
😄Present
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🔘Present (noun) is another word to mean gift. Something you give to someone for a special occasion – like a birthday.
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😄Present
➖➖➖➖➖➖
🔘Present (noun) is another word to mean gift. Something you give to someone for a special occasion – like a birthday.
🔜What's the best present you’ve ever received?
🔜I love it when I receive lots of presents.
🔘Present can also be used as a noun to mean now. It is often used with the – the present.
🔜Stop talking about the future, and start living in the present!
🔜The film is set in the present.
🔘Present (adjective) means 'in a particular place' or 'in attendence'.
🔜I was present for all seven classes.
🔜Why wasn't he present for the meeting?
#Present👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
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We _______ to school on Saturdays.
a. does not go
b. not go
c. don’t go
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#Past... is experience
#present... is experiment
#Future...... is expectation
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