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OpenCV 3.0: How to determine which GPU is used for OpenCL?

Hi,

I ran the ufacedetect.cpp code from the sample folder, and it ran with ~10 FPS. This made me curious to learn:

  • Is it running on the Intel HD 2500 or the nVidia GT 710M in my laptop?

So, how do I determine which GPU is being used? And how do I force either one of the two (Intel or nVidia)?

I have looked through the documentation, but I haven't been able to find an answer. Any help is appreciated!