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
Bacterial meningitis leaves 1 in 5 people with disabilities such as hearing loss, brain damage and limb loss.
But meningitis is largely vaccine-preventable!
Parents/caregivers are urged to visit any primary health care centre to get their children/wards vaccinated against #meningitis.
Your input is crucial in shaping better prevention, treatment and control strategies against #Meningitis in Nigeria.
📋Take our #Meningitis KAP Survey to share your knowledge, attitudes, and practices.
🔗Survey link
https://forms.gle/R5uxSdet2nPNQvpRA
#Meningitis spreads mostly from one person to another through respiratory droplets e.g. coughing, sneezing & close contact such as kissing
Meningitis can affect anyone at any age.
Seek medical attention if you experience symptoms.
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Report immediately to a healthcare facility if you or a loved one experiences
➡️Neck pain
➡️Pain on looking at bright lights
➡️Vomiting
➡️Muscle/joint/limb pain
➡️Rash
➡️Seizures
➡️Cold hands & feet
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Parents and caregivers, now is the time to catch up on the childhood immunisations that protect against meningitis.
Any form of #Meningitis is an emergency!
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➡️Fever/severe headache
➡️Vomiting
➡️Drowsiness
➡️Rash
➡️Seizures
➡️Muscle/joint pain
➡️Stiff neck
The spread of #meningitis is usually through:
➡️ Direct person-to-person contact, including droplets from the nose and throat of infected persons.
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Visit the nearest health facility immediately if you notice any of the CSM-associated signs and symptoms.
#Meningitis is an inflammation of a thin layer of the connective tissue that covers the brain and the spinal cord.
This inflammation can be caused by infection with bacteria, viruses, parasites, fungi, injuries and certain drugs.
Know the symptoms to seek early health care.
Advisory:
https://ncdc.gov.ng/news/508/cerebrospinal-meningitis-public-health-advisory
#Meningitis is an epidemic-prone disease requiring immediate reporting in Nigeria.
ALL healthcare workers are urged to have a high index of suspicion if they notice these signs & symptoms in their patients:
➡️Fever/severe headache
➡️Vomiting
➡️Drowsiness
➡️Rash
➡️Seizures
➡️Muscle/joint pain
➡️Stiff neck
Bacterial meningitis is largely vaccine-preventable; #meningitis vaccines are safe, effective, and give protection to your family and community.
Parents and caregivers, now is the time to catch up on the childhood immunisations that protect against meningitis.
Hand washing is one of the most effective ways of preventing the spread of infectious diseases including #meningitis
Always wash your hands with soap under running water for protection against meningitis and other deadly diseases
Also ensure you and your loved ones are vaccinated with the recommended immunisations
Report immediately to a healthcare facility if you or a loved one experiences the below symptoms of #Meningitis
➡️Neck pain
➡️Pain on looking at bright lights
➡️Vomiting
➡️Muscle/joint/limb pain
➡️Rash
➡️Seizures
➡️Cold hands & feet
Early recognition saves lives