Sub-workload counter granularity

GPUOpen-Tools / gpu_performance_api

GPU Performance API for AMD GPUs

MIT License

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Sub-workload counter granularity #30

Closed msiglreith closed 5 years ago

msiglreith commented 5 years ago

Hi, first of all thanks for publishing this library!

Looking trough the API I'm wondering if there is the possibility to sample workloads on a smaller granularity? If I understand it correctlt, it's currently only possible to get samples per draw/dispatch call for example but not possible to get information about the individual wavefronts in a similiar fashion and granularity as the Radeon GPU profiler (wavefront occupancy)?

Cheers

jlgreathouse commented 5 years ago

Hi @msiglreith

The current performance counter architecture of AMD GPUs does not allow performance counter monitoring of individual wavefronts. RGP uses a different performance monitoring mechanism inside AMD GPUs that is not the same as normal performance counters. GPA is, I believe, designed specifically for gathering performance counters.

msiglreith commented 5 years ago

@jlgreathouse thanks for the response! I assume there isn't public information (API) regarding the performance monitoring used by RGP, is it?

jlgreathouse commented 5 years ago

Unfortunately, no, not at this time.