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
#Premiering_now: From Newsroom to Frontline: Mistresillasie on Power, War & Resistance
#TsedaleLemma speaks with #MistresillasieTamrat.
Click here to watch: https://www.youtube.com/watch?v=JCF8w7rEYhQ
#TheStandardSignal#EthiopiaPolitics#Misteresillasie#ElectionDebate
#PoliticalVoices#WomenInPolitics
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From her striking statement, “politics took journalism away from me,” to her defense of possible participating in upcoming elections, Mistresillasie speaks with clarity.
Premiers at: 7:30 PM EAT tonight.
Subscribe to watch: https://www.youtube.com/@AddisStandard
#TheStandardSignal#EthiopiaPolitics#Misteresillasie#ElectionDebate
#PoliticalVoices#WomenInPolitics
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If peace doesn’t restore rights, is it really peace? If people cannot return safely and with dignity, what does return even mean? Is Ethiopia still governed by its Constitution?
#TsedaleLemma speaks with #DanielBerhane.
Part I premiers at: 7:30 PM tonight.
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#Ethiopia, #Tigray#WesternTigray#ConstitutionalOrder#PeaceAndJustice#IDPRights#RuleOfLaw#HornOfAfrica#PostPretoria
The Standard Signal Ep 16| Two Years Without Justice: Remembering the Brutal Assassination of Bate Urgessa
On April 9, 2024, Bate Urgessa was brutally assassinated by government forces.
This special episode revisits the timeline, and what it reveals about justice and political space in Ethiopia today.
#TsedaleLemma in conversation with #EzekielGebissa
Premiers tonight at 7:30 PM EAT
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#BateUrgessa#Ethiopia#Anniversary#JusticeDelayed#HumanRights#PoliticalViolence#Oromo#OLF#Accountability#HornOfAfrica#TheStandardSignal
#Coming_UP: The Standard Signal | Ep. 13 - The UK’s “New Africa Approach”: Press Freedom, Human Rights, Investment, Migration, and Power Politics in Ethiopia
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#TsedaleLemma speaks with #LukeBullock
Premiers at: 7:30 PM EAT tonight.
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#TheStandardSignal#UKAfricaPolicy#UKInEthiopia#HornOfAfrica#Geopolitics#DevelopmentAndSecurity#ForeignPolicy#Ethiopia#RedSea#Tigray#Eritrea#Somaliland#Israel
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Has Meles Zenawi’s nightmare already arrived?
#TsedaleLemma speaks with #JawarMohammed.
Premiers at: 7:30 PM tonight.
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#GERD#HornOfAfrica#Ethiopia#GulfPolitics#UAE#SaudiArabia#NilePolitics#AfricanGeopolitics#Sovereignty#MiddleEastAfrica#TheStandardSignal
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#TsedaleLemma speaks with #JawarMohammed about the growing challenges facing Ethiopia, from global and regional tensions to domestic instability, corruption and Ethiopia’s fragile election.
Premiers at: 7:30 PM EAT tonight.
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#AddisStandard#TheStandardSignal#Ethiopia#JawarMohammed#EthiopiaPolitics#Corruption#FuelCrisis#HornOfAfrica#Tigray#Amhara#Oromia#EthiopiaElection#AfricaPolitics#EthiopiaNews#AfricanPolitics#Geopolitics