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
Congratulations to all Treasure NFT Session 6 owners!
🎉 Quickly unbox your NFT for a chance to receive $COW.
Please note: if you don't unbox within 48 hours of receiving your Treasure NFT, we cannot guarantee the $COW reward for you. 🚀
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🎉 Congratulations to our lucky Treasure NFT holders who have unboxed amazing ETH rewards! 🪙✨List
Treasure NFTs still have many other benefits, so don’t be disappointed if you didn't get ETH this time.
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✅300 RUBY
✅ETH
Keep exploring and unboxing for more surprises.
Read more and open treasure at: X Post
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🚨 Attention!
The Additional Whitelist Pool for Treasure NFT Session 6 is NOW OPEN! 🚀
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Whitelist File
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🔥 Treasure NFT Session 7 is officially SOLD OUT! 🔥
🚨 Important announcement: Treasure NFT sales will be temporarily paused to allow users to utilize RUBY for activities in partner games using the SingSing SDK.
Get ready for exciting experiences ahead! 🚀
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Treasure NFT Session 6 is officially SOLD OUT! 🎉
Thank you for your amazing support. We're thrilled to announce that the whitelist for Session 7 is now OPEN!
To be eligible:
1️⃣Comment on this Post, tag 3 friends.
2️⃣Fill out the form with your wallet address and the comment link👉form (this form will be closed at 14:00 UTC - July 22)
Don’t miss your chance to be part of the next adventure. 🚀
Note: The additional Whitelist Pool will be opened in next few hours!
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Treasure NFT Session 5 is officially SOLD OUT! 🎉
Thank you for your amazing support. We're thrilled to announce that the whitelist for Session 6 is now OPEN!
To be eligible:
1️⃣Comment on this Post, tag 3 friends.
2️⃣Fill out the form with your wallet address and the comment link👉https://forms.gle/qutLw7av9qbzCNVm8 (this form will be closed at 14:00 UTC - July 15)
Don’t miss your chance to be part of the next adventure. 🚀
#TreasureNFT#SoldOut#Session5#Whitelist#NFTCommunity