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
Microsoft Community Conference 2024 | Uzbekistan
Join us for a premier gathering of the Microsoft Developers Community in Uzbekistan! The annual Microsoft Community Conference is back and promises an unparalleled experience of innovation and technology. Mark your calendar for November 30, 2024, and get ready to immerse yourself in the latest advancements and ideas shaping the tech industry.
🎉 Highlights:
• Inspiring Keynote Presentations: Hear from leading tech innovators and industry experts.
• Interactive Workshops: Explore hands-on sessions with the latest Microsoft tools and technologies.
• Engaging Panel Discussions: Dive into trends and best practices shaping today’s tech landscape.
• Networking Opportunities: Connect with fellow developers, tech professionals, and enthusiasts.
📅 Date: November 30, 2024
📍 Location: Tashkent, Uzbekistan
Don’t miss out on this exciting opportunity to learn, network, and grow within a vibrant community. Whether you're a developer, tech professional, student, or simply passionate about technology, this is an event you won’t want to miss!
🔗 Register Now: https://mdcuzbekistan.com/register
Stay tuned for more updates and join us in shaping the future of technology in Uzbekistan!
#MDCConf2024#MicrosoftDevelopersCommunity#UzbekistanTech#TechConference#CommunityEvent
@mdcuzbekistan
Microsoft Community Conference 2024 | Uzbekistan
Join us for a premier gathering of the Microsoft Developers Community in Uzbekistan! The annual Microsoft Community Conference is back and promises an unparalleled experience of innovation and technology. Mark your calendar for November 30, 2024, and get ready to immerse yourself in the latest advancements and ideas shaping the tech industry.
🎉 Highlights:
• Inspiring Keynote Presentations: Hear from leading tech innovators and industry experts.
• Interactive Workshops: Explore hands-on sessions with the latest Microsoft tools and technologies.
• Engaging Panel Discussions: Dive into trends and best practices shaping today’s tech landscape.
• Networking Opportunities: Connect with fellow developers, tech professionals, and enthusiasts.
📅 Date: November 30, 2024
📍 Location: Tashkent, Uzbekistan
Don’t miss out on this exciting opportunity to learn, network, and grow within a vibrant community. Whether you're a developer, tech professional, student, or simply passionate about technology, this is an event you won’t want to miss!
🔗 Register Now: https://mdcuzbekistan.com/register
Stay tuned for more updates and join us in shaping the future of technology in Uzbekistan!
#MDCConf2024#MicrosoftDevelopersCommunity#UzbekistanTech#TechConference#CommunityEvent
@mdcuzbekistan
Exciting Announcement: The Tech Joined Us as a Media Partner!
We are proud to welcome The Tech as an official media partner of the MDC Uzbekistan. This partnership marks the beginning of an exciting collaboration to support all our initiatives, including hackathons, conferences, and other key events.
With The Tech’s support, we’re set to expand our reach and inspire even more developers across Central Asia. Together, we’ll continue building a stronger tech community!
#MicrosoftDevelopersCommunity#TheTech#MediaPartner#TechEvents#MicrosoftUzbekistan
@mdcuzbekistan