Add GPU monitoring support for AMD and Intel GPUs on Windows using
D3DKMT (DirectX) and PDH performance counters.
- Add PDH-based GPU utilization via \GPU Engine(*)\Utilization
Percentage counter, summing all engine types per adapter (3D, Compute,
Copy, Video).
- Add D3DKMT bindings for adapter enumeration, memory segments, and
adapter perf data.
- Use PDH as primary utilization source (works on all vendors), with
D3DKMT RunningTime as fallback for systems without PDH counters.
- Prefer nvidia-smi when available, fall back to D3DKMT + PDH for
AMD/Intel.
- Backend priority: nvidia-smi -> D3DKMT + PDH -> ErrNoGpuTool.
Verified on AMD 7900XTX GPU with llama.cpp Vulkan & ROCm backend: GPU
utilization correctly shows ~99% during inference, ~0-2% when idle.
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LLM disclosure: GLM 5.1 & Kimi K2.6 have been used extensively during
exploration and coding to the point that the LLM's wrote over 3/4 of the
code, and I have done additional verification myself.
As such, it should be considered experimental.
Additional verification is needed.
I have tested it on my 7900XTX system with Windows 11, and it works
correctly, but as I only have this one rig, I cannot verify it
everywhere.
George
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