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
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While blockchain-based technologies have many qualities that set them apart from other computing paradigms, one of their primary value propositions is the generation of cryptographic truth.
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Full read here.
[2 Feb-8 Feb] DWF Crypto Snapshot
Our latest #crypto report by our Managing Partner Andrei Grachev is up.
In this week's round up 💫
💠 Bitcoin #NFTs? It’s More Likely Than You Think
💠 Federal Rate Hikes Fuel #Bitcoin Price Sentiments
💠Renewed NFT Interest Drives #Trading And Lending On Popular #Marketplaces
💠History Comes To Life As Woodstock Takes To The #Metaverse
💠Western Financial Institutions Push #Crypto Prices With Spot Inflows
💠Japan Aims To Revitalize Its #Economy With Web3 #Innovation
💠Major #Web2 Companies Starts Hiring To Bolster #Web3 Capability
Full readhere.
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🚀 Tria Integrates Aptos Network for Enhanced Global Transactions
Tria, a non-custodial financial operating system, has announced the integration of its global trading engine with the Aptos network. According to ChainCatcher, this integration allows over 500,000 users across more than 150 countries to directly access and trade Aptos assets. Users can now perform cross-chain exchanges and asset interactions within a single application without the need for cross-chain bridges.
The collaboration aims to leverage Aptos's sub-second confirmation and parallel execution technology to provide users with a seamless transaction experience. Additionally, it seeks to further connect traditional finance, Web2, and on-chain infrastructure.
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