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Hi,
Indeed, you have to make sure you build OpenCV without TEGRA_OPTIMIZATION or IPP (you have to install such library so by default, this is not enabled). Then, you have to disable opencl using cv::ocl::setUseOpenCL(false) to prevent OpenCV to use your graphic card.
After a brief investigation of the source code (2.4.9), it seems Canny (as well as Sobel) was not optimized using TTB... It should then run using only one processor. Please tell us if it's not the case!
