[caskstrength]

> For everything else, including desktop and mobile operating systems realtime sounds like a good idea.

Why on earth would you need real time on desktop? Every time the topic is discussed on internet bunch of confused people chime in with this sentiment that doesn't make much sense. "RTOS" is not some magic that somehow makes everything on your desktop fast. All it would do in reality is make everything slower for 99% of your interaction but guarantee that "slowness" is uniform and you don't have any weird latency spikes in other 1%. Note that for cases that are not "nuclear reactor control system that requires Very Certified OS with audited and provable reaction times" RTLinux is already available, but distros are not inclined to leverage it on desktop for reason described above.

[vbezhenar]

I've read many opinions of those who used QNX on desktop in the past, that it felt much more "snappy" compared to other systems.

Desktop definitely has real time tasks. Any animation is real time task. When I'm listening to music, it's real time task. macOS sound interrupts for a short time, when something hardware-related happens, so it's not pleasant experience. You might argue that user can tolerate those interruptions, but for me those are just bugs.

[vacuity]

Indeed. There are people who have a fair point that desktops for users (as opposed to servers) should have a focus on being responsive and useful. Like how writing on a piece of paper produces meaningful markings in real time, user interfaces should be able to perform tasks with analogous interactivity. See comments about BeOS elsewhere in this thread. I don't know about the extreme, but the overall sentiment is valuable and a far cry from the current state of the desktop experience.

[AndriyKunitsyn]

When recording live audio performances, some guarantees that the thread that records the signal will always get some attention for the scheduler, would be nice. Otherwise the recording program will miss on the signal, and the recording will have cracks.

We sidestep this problem because our CPUs are insanely fast for this task, so as long as you don't game, compile and record audio at the same time, you should be fine. But we don't have any guarantees.