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nanoUFO@sh.itjust.works

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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[–] 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.