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
#RVN/USDT analysis :
#RVN is in a downtrend, making new lows and trading below the 200 EMA. The price is currently retesting a previously respected support zone. It is expected to decline from this level and continue the downtrend, with previous lows will be tested again.
TF : 4h
Entry : $0.01770
Target : $0.01596
SL : $0.01893
#RVN/USDT analysis :
#RVN has broken out of the previous swing high resistance zone and the 200 EMA. It is currently consolidating above these levels. The price is anticipated to sustain its bullish momentum and potentially reach new highs.
TF : 2H
Entry : $0.01745
Target : $0.01942
SL : $0.01618
#RVN/USDT analysis -
#RVN has broken down and retested the resistance zone. It's now set to keep going down and try new lows. The previous support is expected to be tested.
TF : 2H
Entry : $0.01770
Target : $0.01630
SL : $0.01845
#RVN/USDT analysis -
#RVN is in a downtrend, hitting new lows while trading below the 200 EMA. The price is currently rejecting from the resistance zone and is expected to decline from there, continuing its bearish momentum. Wait for a pullback near the resistance zone for a short entry. Aim for the previous swing low as your target level.
TF : 1H
Entry : $0.0206
Target : $0.0187
SL : $0.0220
#RVN up 4,030% - Absolutely incredible🔥
💰A nice
4️⃣
0️⃣
🔠 return from this single Signal⭐
While others take massive losses trading spot, only making money when prices go up - we win big with futures profiting even when market goes down. That's the difference between smart investing and bad decisions 🏝
If you want the best, this is your chance
🔥BULL MARKET SALE IS LIVE🔥
The market is heating up, and we are at the peak of the year. It looks like more big days are ahead. Let's keep riding this wave, it's going to be absolutely insane!💯
DM me now to start!👇
http://t.me/Kevindexter
#RVN rejected from the Trendline on Weekly time frame,in the case of correction we can buy it again at Weekly Demand zone,send it💫
❄️@signals_bitcoin_crypto❄️
❄️@Shadow_support0o❄️