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
Live: Evacuation of hantavirus-hit cruise ship underway
A large-scale evacuation has started for passengers aboard a cruise ship stricken by a #hantavirus outbreak. The affected MV Hondius has anchored near Tenerife in Spain, where local health officials arranged orderly disembarkation. The viral outbreak has caused multiple infections and three fatalities. Asymptomatic travelers are prioritized for medical checks before being sent to the airport to return to their nations. The World Health Organization has released surveillance guidelines, advising all evacuated passengers to undergo prolonged health monitoring to stop further transmission.
via CGTN
Swiss authorities have confirmed a case of #hantavirus identified in a passenger from the MV Hondius cruise ship.
He had responded to an email from the ship’s operator informing the passengers of the health event, and presented himself to a hospital in Zurich, Switzerland, and is receiving care.
In line with the International Health Regulations (IHR), WHO is working with relevant countries to support international contact tracing, to ensure that those potentially exposed are monitored and that any further disease spread is limited.
The type of virus in this outbreak has been confirmed as Andes hantavirus by the National Institute for Communicable Diseases @nicd_sa, South Africa and the Geneva University Hospitals @hug_ge, Switzerland The support of the Institut Pasteur de Dakar @PasteurDakar, Senegal and the Administración Nacional de Laboratorios e Institutos de Salud @ANLIS_Malbran, Argentina has also been critical in responding to this event.
As of 6 May, there are 8 cases, 3 of whom are confirmed as hantavirus by laboratory testing.
WHO will continue to work with countries to ensure that the patients, contacts, passengers and crew have the information and support they need to stay safe and prevent spread.
X LINK
About Hantavirus
(spread mainly by rodents)
Swiss authorities have confirmed a case of #hantavirus identified in a passenger from the MV Hondius cruise ship.
He had responded to an email from the ship’s operator informing the passengers of the health event, and presented himself to a hospital in Zurich, Switzerland, and is receiving care.
In line with the International Health Regulations (IHR), WHO is working with relevant countries to support international contact tracing, to ensure that those potentially exposed are monitored and that any further disease spread is limited.
The type of virus in this outbreak has been confirmed as Andes hantavirus by the National Institute for Communicable Diseases @nicd_sa, South Africa and the Geneva University Hospitals @hug_ge, Switzerland The support of the Institut Pasteur de Dakar @PasteurDakar, Senegal and the Administración Nacional de Laboratorios e Institutos de Salud @ANLIS_Malbran, Argentina has also been critical in responding to this event.
As of 6 May, there are 8 cases, 3 of whom are confirmed as hantavirus by laboratory testing.
WHO will continue to work with countries to ensure that the patients, contacts, passengers and crew have the information and support they need to stay safe and prevent spread.
X LINK
About Hantavirus
(spread mainly by rodents)
Soberanía Sanitaria
🐦@SoberaniaSalud
____
#Hantavirus: el precio de desfinanciar ➡️Investigadorxs del CONICET cuentan en esta nota qué es lo que faltó, en qué se recortó, y cómo debería actuarse en estas situaciones. Siempre, la importancia de un Estado presente. @RAIIS_ARGhttps://t.co/oqkK5bXcf4
____
🔗http://twitter.com/SoberaniaSalud/status/1087361266790871045
🦠🚨HANTAVIRUS OUTBREAK HITS 36 AMERICANS ACROSS 16 STATES
🔹 16 cruise passengers quarantined at Nebraska Medical Center, 2 more at Emory Atlanta 🚢
🔹 Only known human-to-human hantavirus strain - rare Andes virus with 6-week incubation ⚠️
🔹 42-day quarantine as 11 cases confirmed globally, 3 deaths, 150 total exposed 💀
🔹 Monitoring in Texas, Georgia, Arizona, Virginia, California with twice-daily checks 🌡️
CDC says pandemic risk 'extremely low' but one French patient on life support
This Andes strain killed Gene Hackman's wife - could explode nationwide! 😰
#USNews#Hantavirus
@america
🛥️🦠 Trois autres passagers à bord du bateau de croisière MV Hondius ont montré des symptômes du hantavirus, rapporte la chaîne CNN.
Précédemment, la BBC, citant des responsables du ministère sud-africain de la Santé, avait rapporté qu’un passager de 70 ans et son épouse de 69 ans, tous deux de nationalité néerlandaise, figurent parmi les victimes d’une possible flambée de hantavirus à bord du paquebot de croisière MV Hondius, qui assurait la liaison entre l’Argentine et le Cap-Vert.
Photo: New York Post/X
#hantavirus#paquebot#victimes
🛥️🦠 Trois autres passagers à bord du bateau de croisière MV Hondius ont montré des symptômes du hantavirus, rapporte la chaîne CNN.
Selon CNN, le navire transportait 170 passagers et 71 membres d’équipage. Il est désormais amarré dans le port de Praia, la capitale du Cap-Vert. Les passagers et l’équipage n’ont pas l’autorisation de quitter le paquebot, des médecins les examinent à bord.
Précédemment, la BBC, citant des responsables du ministère sud-africain de la Santé, avait rapporté qu’un passager de 70 ans et son épouse de 69 ans, tous deux de nationalité néerlandaise, figurent parmi les victimes d’une possible flambée de hantavirus à bord du paquebot de croisière MV Hondius, qui assurait la liaison entre l’Argentine et le Cap-Vert.
Photo: New York Post/X
#hantavirus#paquebot#victimes