How to stop using GPU in OpenCV 3.2?

asked 2017-01-18 10:37:51 -0500

caruofc gravatar image

I set cv::ocl::setUseOpenCL(false); and verified using useOpenCL(). But my code is still using GPU when I use UMat. How can I stop using GPU? Temporarily I am using a workaround that uses Mat instead of UMat.

Anybody else is facing the same issue?

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How can you know that's GPU is used?

LBerger gravatar imageLBerger ( 2017-01-18 13:46:49 -0500 )edit

Somehow I knew this question would be asked :). I used TechPowerUp GPU-Z tool to figure that out.

caruofc gravatar imagecaruofc ( 2017-01-18 13:49:55 -0500 )edit

Ok Now I think cv::ocl::setUseOpenCL(false) disable opencl call and not opencl storage. When UMat is used I think data are stored in GPU even when setUseOpenCL(false) is called. I have checked in debug mode. Now how to disable this ?

You can check speed using this source files

LBerger gravatar imageLBerger ( 2017-01-18 14:27:29 -0500 )edit

Thanks LBerger for confirming, So I am not the only one who sees the issue and therefore, my question stands.

caruofc gravatar imagecaruofc ( 2017-01-18 14:37:56 -0500 )edit

you can make an issue

LBerger gravatar imageLBerger ( 2017-01-18 14:39:50 -0500 )edit
2 (Created). thnx

caruofc gravatar imagecaruofc ( 2017-01-18 14:58:13 -0500 )edit

Found the solution: You have to call cv::ocl::setUseOpenCL(false); in every thread that uses UMat.

caruofc gravatar imagecaruofc ( 2017-01-25 17:06:22 -0500 )edit