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Journeyman III

How does CodeXL GPU Profiling works under the hood?

I'm curious about how the gpu profiling is done in particular.

The official site: only states:

"AMD CodeXL also provides a GPU profiler that collects and visualizes GPU counter data, application trace, kernel occupancy and hotspots analysis for AMD APU and GPUs. The profiler gathers data from the OpenCL™ run-time and AMD Radeon™ GPUs during the execution of an OpenCL™ application."

What profiling types are used in particular?


Event-based profiling with the help of something like clGetEventProfilingInfo ?

Does CodeXL also instrument the program?

If yes, how? Thorugh runtime instrumentation or runtime injection, ...?

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