this post was submitted on 12 Mar 2024
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DirectX 12 'Work Graphs' aim to eliminate CPU bottlenecks by putting the GPU in charge (www.tweaktown.com)
submitted 8 months ago by nanoUFO@sh.itjust.works to c/games@sh.itjust.works
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[โ€“] KeenFlame@feddit.nu 2 points 8 months ago (1 children)

Buncha dry students here giving you shit. It is not a stupid question.

Some day we might not need a cpu. The biggest hurdle probably isn't actually even the chip architecture, but that the software needs to be remade and it's not something you do in a day exactly

[โ€“] Socsa@sh.itjust.works 3 points 8 months ago* (last edited 8 months ago)

Right, GPGPU is a thing. You can do branch logic on GPU and you can do SIMD on a CPU. But in general, logic and compute have some orthogonal requirements which means you end up with divergent designs if you start optimizing in either direction.

This is also a software architecture and conceptual problem as well. You simply can't do conditional SIMD. You can compute both graphs in parallel and "branch" when the tasks join (which is a form of speculative execution), but that's rarely more efficient than defining and dispatching compute tasks on demand when you get to the edges of the performance curve.