> Of course it does, where do you think IrisGL and Renderman were used for?
Not only are you confusing native UI stack for OS/HW capabilities, you are also seemingly confusing CPU/GPU workloads.
Nothing at all stops Renderman from running on Plan9, other than Renderman not having native Plan9 support.
Renderman does CPU ray-tracing, as ray-tracing still cannot be done in GPU (and no, RTX has no value in production quality rendering). The only GPU feature of Renderman is a post denoising filter, which will otherwise happily fall back to CPU.
> An OS architecture that doesn't do DMA for maximum hardware performance just isn't up to the game.
DMA has no effect on Renderman.
At this point, based on this history of this thread, I'll have to conclude that you have no idea what you're talking about at all.
