We have a VOD service and we are using nginx as webserver.
Our system doesn't use nginx-vod-module instead it just has all the small m4s files for a dash stream.
I came across this article(Thread Pools in NGINX Boost Performance 9x) by Valentin Bartenev.
It says that enabling aio in nginx might be a good solution for reducing io wait and load.
but it says:
A good example here is FreeBSD. Unfortunately, we can’t say the same about Linux. Although Linux provides a kind of asynchronous interface for reading files, it has a couple of significant drawbacks.
then I came across this question and this answer:
AIO on Linux is horribly broken by design. Nginx supports it, but you probably don't want to use it since you can't use the disk cache at the same time.
but those were for more than 5 years ago. I wanted to know since our OS is linux and we have a lot of basically random requests for any of the files is enabling aio any good? or running more nginx worker processes per core might perform better on linux?