Add RenderDoc API calls to profile Vulkan backend (non-presenting) #20558
Comments
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As an alternative, how hard would it be to present some (empty) frames (to a null/virtual surface)? I think this would potentially help with more profilers than just renderdoc. |
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We should already be using the renderdoc API, since #10893. That code is quite old though, so it may need some debugging/updating. |
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Yeah, the API as implemented in #10893 is the right way to go. It worked as of last summer. See https://iree.dev/developers/performance/profiling-gpu-vulkan/#renderdoc. @kuhar I have a branch floating around that did that but it's an opt-in at cmake configure time because of how heavy-weight it is (pulls in WSI goo and requires platform-specific tricks, and the tools I was testing with did not pick up null/virtual surfaces so I had to create offscreen windows and other things that only work in certain contexts). You can check it out at main...benvanik:iree:users/benvanik/vk-present - it wasn't reliable enough to use, though, as the tools I tried it with (that don't have an API or capture without the need for frame swaps) were also bad enough to do things like always ignore the first N frames, only capture when the user hits a hotkey, or only capture when the application has focus (which with an offscreen window doesn't happen). I also had a branch for RGP that used their API: main...users/benvanik/rgp that was significantly more reliable than the offscreen window trick but their "API" is a trashfire that was unreliable enough to not be useful. It raced itself and you'd have to do 10+ capture requests and hope at least one of them captured. RenderDoc does this itself internally because it's so broken: https://github.com/baldurk/renderdoc/blob/788a0ca98fac37c35a66be5fcb9ccc9197df7f34/renderdoc/replay/replay_controller.cpp#L1755 Sucks, but tools that hook into the process and don't provide an API to trigger a capture reliably aren't really worth supporting outside of hacks - they break too often and are too difficult to test ;( |
Request description
RenderDoc can only capture headless (non-presenting) via the in-application API.
Add calls to
StartFrameCapture()andEndFrameCapture()iniree-run-moduleandiree-benchmark-module.What component(s) does this issue relate to?
Runtime
Additional context
No response
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