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
🚗💥 Introducing the Manhart MHXM 900! 💥🚗
Get ready to experience the ultimate BMW XM upgrade! 🌟
🔧Power Boost: From a stock 748 hp and 1000 Nm to an astonishing 900 hp and 1200 Nm! 💪🔥
⚙️Suspension Upgrade: Featuring H&R springs for enhanced handling! 🛠️
🛞Stunning Wheels: Equipped with eye-catching 24-inch Manhart wheels! 😍
🌌Carbon Fiber Body Kit: Lightweight and aggressive styling that enhances performance! 🖤
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🏎️ McLaren Artura gets a massive wing and body kit by Novitec
Novitec has added a giant wing mounted on pylons, along with a body kit, redesigned bumpers, and a new engine cover, all made of carbon fiber.
The exhaust system can be crafted from stainless steel or Inconel, with an option for a gold coating at extra cost. Not only does it enhance the engine's sound, but it also boosts its performance by an estimated 35 horsepower, according to the tuners.
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🚗✨ Restomod Magic: BMW 8 Series Reimagined! ✨🚗
Check out this stunning restomod of the first-generation BMW 8 Series! 🏎️💨
🔧 Upgrades Include:
- Carbon Fiber Panels: Lightweight and sleek! 🖤
- Powerful V10 Engine: Swapped from the BMW M5 (E60) and bored out to 5.8 liters! 💥
- Modern Interior Touches: Blending classic with contemporary! 🛋️
#BMW#Restomod#8Series#M5#CarEnthusiast#ClassicMeetsModern#CarbonFiber#V10Power#Auto🚘💫
🚗✨Brabus Transforms Mercedes-AMG SL into a 1000-HP Shooting Brake!🔥
The new body and aerodynamic features are crafted entirely from carbon fiber. The turbocharged V8 has been enlarged from 4.0 to 4.5 liters, and now, combined with an electric motor on the rear axle, the powertrain delivers a staggering 1000 HP and 1620 Nm of torque! 💪⚡
These bespoke three-door beauties will be built to order, tailored to individual specifications. Pricing is not publicly disclosed. 💎
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🚗💨 Introducing the Acura Integra Type S with HRC Factory Tuning! 🔥✨
Get ready to be amazed by the incredible upgrades:
🔹 Aggressive Front Bumper with an enhanced splitter
🔹 Sleek Rear Bumper featuring a diffuser
🔹 Carbon Fiber Hood for that lightweight edge
🔹 Forged 19-inch Wheels wrapped in Pirelli P Zero Trofeo R tires
🔹 Stunning Carbon Fiber Wing on aluminum supports
To lighten the load:
🔸 Carbon Fiber Rear Doors
🔸 Recaro Seats for ultimate comfort and support
🔸 Strut Brace replacing the rear bench for added rigidity
And let’s not forget the performance upgrades:
🔹 Coilover Suspension for precision handling
🔹 Six-Piston Brembo Brakes up front for unmatched stopping power
This beast is built for the track! 🏁💥
#AcuraIntegraTypeS#HRC#FactoryTuning#CarEnthusiast#Performance#CarbonFiber#Brembo#Pirelli#Auto
Just sold at auction! 🚗💰
This stunning Alfa Romeo 2000 GTV restomod with a carbon fiber body went for $220,000. 🤑
It took around four years to build this beauty, with everything from the chassis to the powertrain being completely overhauled.
🛠️ Italian specialists worked on the chassis and body, while the rest of the work was done in Canada. The upgraded 2.0 carbureted engine's exact output isn't specified, but the original Alfa Romeo 2000 GTV came with a 130-horsepower engine. 🏁
#AlfaRomeo#2000GTV#Restomod#CarbonFiber#Auction#ClassicCar#LuxuryCar#ItalianStyle🇮🇹