Remove GPU idle bubbles between the graphics and async compute queues #1034

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opened 2026-10-25 01:02:05 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-25 01:02:05 +00:00

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Find which waits cause them and reorder or retime the work (submit order, earlier signals, moving independent work across) so neither queue drains while waiting.

Done when: total GPU frame time drops at the same scene and the trace shows the gaps gone or shorter.

Profiled with Nsight Graphics GPU Trace + shader profiler on an RTX 5090 (full GI scene, ~61 FPS, GPU ~16.3 ms/frame). The GPU Trace timeline shows ~4 fully idle gaps per frame (around 2.3, 5, 10-10.5 and 14.7 ms of a 17 ms frame), each at a cross-queue semaphore wait, about 1 ms of idle GPU per frame in total. Find which waits cause them and reorder or retime the work (submit order, earlier signals, moving independent work across) so neither queue drains while waiting. **Done when:** total GPU frame time drops at the same scene and the trace shows the gaps gone or shorter.

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sky_line added this to the Slipstream project

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2026-10-25 01:19:01 +00:00