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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.
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🔥
🔥 What's up with the listing of HOT and the project overall ?
⚡️ Futures on HOT can already be traded on the 🐂#WhiteBIT exchange, and the price is promising 🤘
Chart on the screenshot, 1 HOT = 9.142 USDT). When spot trading for HOT will be launched is just a matter of time...
.
🙂#MineHOT here:
https:://t.me/herewalletbot/app👈
🔥
🔥 What's up with the listing of HOT and the project overall ?
⚡️ Futures on #HOT can already be traded on the 🐂#WhiteBIT exchange, and the price is promising 🤘
Chart on the screenshot, 1 HOT = 6.600#USDT). When spot trading for HOT will be launched is just a matter of time...
.
🙂#MineHOT here:
https:://t.me/herewalletbot/app👈
➖
🔥 What's up with the listing of HOT and the project overall ?
⚡️ Futures on #HOT can already be traded on the 🐂#WhiteBIT exchange, and the price is promising 🤘
Chart on the screenshot, 1 HOT = 8.438#USDT). When spot trading for HOT will be launched is just a matter of time...
.
🙂#MineHOT here:
https:://t.me/herewalletbot/app👈
➖
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Shared by Dimitri
🔥 What's up with the listing of HOT and the project overall ?
After #Notcoin🤑, one of the major applications that launched was:
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💯 In conclusion, we can say that the game has a strong foundation and prospects for future development.
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