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
#Lassafeverinfo
Our latest Lassa Fever Situation Report has been published on our website (week 23).
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
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Our latest Lassa Fever Situation Report has been published on our website (week 22).
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
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Our latest Lassa Fever Situation Report has been published on our website (week 6).
In this reporting week, a total of 68 confirmed cases were recorded.
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
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Our latest Lassa Fever Situation Report has been published on our website (week 4).
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
#Lassafeverinfo
Our latest Lassa Fever Situation Report has been published on our website (week 2).
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
#Lassafeverinfo
Our latest Lassa Fever Situation Report has been published on our website (week 49).
This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
In total for 2024, 1035 confirmed cases of #LassaFever have been recorded across 28 States in Nigeria.
🔗Download, read, and share our latest #LassaFever situation report via:
https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
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In total for 2024, 1018 confirmed cases and 172 deaths of #LassaFever have been recorded across 28 States in Nigeria.
🔗Download, read, and share our latest #LassaFever situation report via:
https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
#LassaFeverInfo
In total for 2024, 1005 confirmed cases of #LassaFever have been recorded across 28 States in Nigeria.
🔗Download, read, and share our latest #LassaFever situation report via:
https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria
#LassaFeverInfo
In this week's #LassaFever situation report, we provide a summary of the epidemiological situation and response activities in Nigeria.
🔗Download, read, and share via
https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%ll20in%20Nigeria
#LassaFeverInfo
In this week's #LassaFever situation report, we provide a summary of the epidemiological situation and response activities in Nigeria.
🔗Download, read, and share via
https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%ll20in%20Nigeria
#LassaFeverInfo
You can not be too safe!
#Lassafever presents with symptoms similar to those of many illnesses like malaria.
Healthcare workers are urged to always have a high index of suspicion and practice standard infection prevention and control measures when attending to patients.
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