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opencl performance test

I've compiled OpenCV 2.4.7 with OpenCV support. Am using an AMD V5900.
I want to do some OpenCV tests. I'm not sure how to test/verify that OpenCL is being used. I ran perf and test and got these results:

opencv_test_ocl.exe 244 FAILED TESTS YOU HAVE 2 DISABLED TESTS

opencv_perf_ocl.exe 40 FAILED TESTS YOU HAVE 4 DISABLED TESTS

The only comparison sample I saw was ocl-example-squares.exe. It report this: cpp average time: 66.0707ms ocl average time: 90.9966ms How is that to be interpreted? What is the best way to measure/report the difference in performance between the CPU and GPU?

Thanks, Chris