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Is there a standard way of getting the current load on the GPU? I’m looking for something similar to the Task Manager showing CPU%. Utilities such as GPU-Z show this value but I’m not sure how it gets this. I’m specifically interested in AMD graphics cards at the moment, any pointers would be helpful.
If there’s no clean API way of doing it, are there any programs whose output I can capture to get this info?
For AMD/ATI cards, check out GPU PerfStudio. http://developer.amd.com/gpu/Pages/default.aspx
For NVidia cards, look at PerfHUD. http://developer.nvidia.com/object/nvperfhud_home.html
There is also a more generic tool in the DirectX SDK from MS called Pix that overlaps partially with these tools.
AFAIK there’s no way to get something as simple as a %-use number for the GPU because it isn’t that simple. But these tools will help in debugging and profiling what’s going on in the GPU. Both ATI and NVidia provide public documentation with recommended steps to find and fix specific types of GPU bottlenecks.