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
🔅ETHUSD Will Go Up! Long!📈
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Here is our detailed technical review for📊ETHUSD.
The price is testing a key support 2,258.90.
Current market trend & oversold RSI makes me think that buyers will push the price. I will anticipate a bullish movement at least to 2,300.40 level.
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🔅ETHUSD Will Go Up! Buy!📈
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Here is our detailed technical review for📊ETHUSD.
The market is on a crucial zone of demand 2,331.82.
The oversold market condition in a combination with key structure gives us a relatively strong bullish signal with goal 2,374.44 level.
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🔅ETHUSD Is Going Down! Sell!📉
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The price is testing a key resistance 2,265.42.
Taking into consideration the current market trend & overbought RSI, chances will be high to see a bearish movement to the downside at least to 2,216.41 level.
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🔅ETHUSD Is Bearish! Sell!📉
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Here is our detailed technical review for 📊ETHUSD.
The price is testing a key resistance 2,429.70.
Taking into consideration the current market trend & overbought RSI, chances will be high to see a bearish movement to the downside at least to 2,177.11 level.
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🔅ETHUSD Will Move Higher! Long!📈
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The market is approaching a significant support area 2,028.29.
The underlined horizontal cluster clearly indicates a highly probable bullish movement with target 2,088.97 level.
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🔅ETHUSD Is Very Bullish! Buy!📈
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The market is approaching a key horizontal level 1,989.88.
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🔅ETHUSD Is Going Down! Sell!📉
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The market is approaching a significant resistance area 2,131.97.
Due to the fact that we see a positive bearish reaction from the underlined area, I strongly believe that sellers will manage to push the price all the way down to 1,759.92 level.
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🔅ETHUSD Will Go Up From Support! Buy!📈
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The price is testing a key support 1,979.31.
Current market trend & oversold RSI makes me think that buyers will push the price. I will anticipate a bullish movement at least to 2,125.28 level.
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The market is approaching a key horizontal level 1,961.90.
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🔅ETHUSD Is Going Up! Long!📈
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The market is approaching a key horizontal level 2,050.77.
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🔅ETHUSD Will Move Higher! Long!📈
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The market is approaching a significant support area 2,676.10.
The underlined horizontal cluster clearly indicates a highly probable bullish movement with target 2,878.21 level.
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🔅ETHUSD Is Very Bearish! Sell!📉
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The price is testing a key resistance 2,894.86.
Taking into consideration the current market trend & overbought RSI, chances will be high to see a bearish movement to the downside at least to 2,786.03 level.
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