Async in practice: how to achieve concurrency in FastAPI (and what to avoid doing!)

[@hamzadlm6625]

« writing async in front of every function and hoping for the best » yup that’s me 😂

[@dasshrs]

That is really how it looks like when you do not check the implementation under the hood That was me too btw:)

[@swx6074]

Your tutorials are one of the best out there, perfect amount of theory and examples. You should totally upload more:)

[@serhiiserhieiev2583]

Лучшее видео по FastAPI что я смотрел за последнее время. Кратко и в то же время очень ёмко. Видно что автор глубоко разбирается в вопросе. Респект!

[@evgenymaksimov]

спасибо :)

[@rns10]

This video is really a good reference when converting a sync project to async selectively. I will have to this video 2-3- times to understand whats going on in each scenario. I recently saw a conference video as well where they highlighted how making app async can block CPU bound processes, but there were not many examples. This video covers that extensively. Thank you

[@dasshrs]

You desire a million views - that is a great in-depth tutorial!

[@corner4730]

This is awesome content dude, I am subscribing right away

[@zemalex89]

finally amazing explanation with good examples I don't know how how come that you don't have a milion of views

[@avitiwari7921]

Excellent tutorial👌 and very accurate, precise chart. These are some much needed topics to be taken care of. My small request will be to share the code and chart in a repo, it will be much helpfull.

[@evgenymaksimov]

Thank you for the kind words! Noted, I added git with chart to the video description :)

[@КириллКулаков-т7г]

hi, Evgeny! great job! crystal clear explanation! big thanks!

@evgenymaksimov 26:09 Of course, we cannot see that it has made a big difference with just a request. If you send thousands of IO-heavy requests, each request will be dedicated to a different thread, and as you said before, the application will lose performance after a while because the threads are memory hungry. If we use coroutines instead, I can say that they are lighter threads, the application will run more efficiently. Actually this may also be an answer to when to use thread and when to use async.

[@evgenymaksimov]

great point! thanks

[@beme-l2k]

great vid! Just one thing, I think your "run_in_process" function is actually creating a thread and not a process, no?

[@chapizishorts6528]

14:50 What about GIL, doesn't it forbid to create multiple threads within 1 process?

[@evgenymaksimov]

It doesn't forbid to create, it just doesn't let more than one kernel thread take execution at the same time. However, for I/O calls GIL is getting realeased, so it doesn't impact it in our case

[@huyubosaka8906]

Thx for best material. It will be interesting if you do video about ASGI and WSGI web servers.

[@evgenymaksimov]

Thank you! I’m considering it

[@payitapp]

Is it just me or our good tutor looks like Scarlett Johansson's brother 🤔. This is A really good tutorial by the way. Gives good context for how to write Async code.

[@jafeta.7553]

Great video. Thank you very much!

[@ahmadreza2189]

Great video, well done!

[@rondechaka1160]

This video should have more views 👍

[@akshaysarbhukan6701]

Thanks for the tutorial. I have a question, is there any way to implement server sent events in FastAPI?

[@evgenymaksimov]

take a look at pip package sse-starlette, it adds this functionality and you can use it with fastapi!

[@akshaysarbhukan6701]

@@evgenymaksimov thanks. So basically FastAPI still uses http 1.1 on top of which sse-starlette implements SSE, am I correct?

[@evgenymaksimov]

@@akshaysarbhukan6701 not quite. FastAPI itself doesn't have hard dependecy on webserver. Regularly most use uvicorn as webserver, which uses http 1.1, but you can install hypercorn instead which supports 2.0 and it will work just fine

[@akshaysarbhukan6701]

@@evgenymaksimov yeah, got it. Thanks again for the help.

[@jimmykhaidem9291]

Hi bro, can you make a video of using chunk method

[@alekseichulei9955]

Did you try to use psycopg3 since it provides async?

[@SabyrBerikuly]

can you send a book you are referring to in your video?

[@neerajbansal2613]

thanks, good info

[@luisgarciacuesta6120]

Great video, thanks!

[@radoniainarakotonirina2856]

Very interesting

[@Урал-и1б]

Отличное видео

[@Optimusjf]

Excelent

[@Smarandii]

Good job comrade

[@tomasemilio]

Awesome

[@unicoxr5tj417]

подписался) Жека а че не на русском?)

[@CodingByAmp]

i support follow

[@PassengerNY]

Есть на русском?