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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🚀 U.S. March CPI Expected to Rise Amid Ongoing Iran Conflict
The market widely anticipates that the U.S. Consumer Price Index (CPI) for March will increase by 3.4%, surpassing last month's 2.4%, marking the largest year-on-year rise in two years. According to Jin10, during past oil market shocks, the most likely commodities to see price hikes include aviation fuel, steel, aluminum, natural gas, fertilizers, and plastics. Industries reliant on these materials are already feeling the strain. The ongoing Iran conflict, which has lasted several weeks, has shifted concerns from the initial oil price surge to the compounded effects of a prolonged conflict. For many economists, the most alarming aspect is not the immediate issues but the "aftershocks" that may emerge months or even years later. JPMorgan's CEO has referred to inflation as a potential "fly in the ointment" that could undermine stock market returns in 2026. Harvard University professor and former IMF chief economist Ken Rogoff recently discussed an overlooked impact of the war: the increased military spending's effect on the already strained U.S. budget deficit. He noted the risk of soaring bond yields, which could harm the stock market and affect U.S. affordability. Rogoff also mentioned that the current supply disruptions caused by the Iran conflict are sufficient to keep oil prices elevated for a year.
#USCPI#inflation#IranConflict#oilprices#aviationfuel#steel#aluminum#naturalgas#fertilizers#plastics#economicimpact#stockmarket#JPMorgan#budgetdeficit#militaryspending#bondyields#HarvardEconomist#supplydisruptions#USaffordability