Profiling: make Tracy useful again (explicit dev-build switch, Vulkan GPU zones) #621

New issue

Open

opened 2026-10-10 01:58:52 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-10 01:58:52 +00:00

Owner

Tracy is compiled out of every build today: indra/cmake/Tracy.cmake enables it only when the channel matches ^alchemy test, which no longer exists. Its GPU zones were only ever wired for OpenGL, so even when enabled it shows CPU zones only.

Do (later)

An explicit dev-build switch (-DUSE_TRACY=ON, never in shipped builds), replacing the stale channel regex.
Vulkan GPU zones (TracyVulkan.hpp, calibrated timestamps) driven from our existing gpuSubMark pass marks, so one timeline shows CPU threads and GPU passes together.
Useful for the open threading hitches (LL_texFetch lock, fillJoinWait, LL_retiringRegions), which are cross-thread problems that text hitch logs show poorly.

Tracy is compiled out of every build today: `indra/cmake/Tracy.cmake` enables it only when the channel matches `^alchemy test`, which no longer exists. Its GPU zones were only ever wired for OpenGL, so even when enabled it shows CPU zones only. ## Do (later) - An explicit dev-build switch (`-DUSE_TRACY=ON`, never in shipped builds), replacing the stale channel regex. - Vulkan GPU zones (`TracyVulkan.hpp`, calibrated timestamps) driven from our existing `gpuSubMark` pass marks, so one timeline shows CPU threads and GPU passes together. - Useful for the open threading hitches (`LL_texFetch` lock, `fillJoinWait`, `LL_retiringRegions`), which are cross-thread problems that text hitch logs show poorly.

sky_line added the

priority

low

triage

labels

2026-10-10 01:58:52 +00:00

sky_line added this to the Slipstream project

2026-10-10 01:58:52 +00:00

sky_line removed the

triage

label

2026-10-11 16:37:33 +00:00