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Runtime error building opencl kernel

asked 2013-10-08 09:01:51 -0500

arm gravatar image

On Ubuntu 12.04 LTS with NVidia GeForce 8 series GPU card, I am getting runtime error from the ocl-facedetect sample of OpenCV 2.4.6.1 building the kernel required for the sample:

$./ocl-example-facedetect -t haarcascade_frontalface_alt.xml -i friends.jpg In image read loop0 ~~~~ Loading convertC3C4 Building source:./convertC3C4_GeForce 8600 GT -D GENTYPE4=uchar4.clb ~~~~ Loading RGB2Gray Building source:./RGB2Gray_GeForce 8600 GT -D DEPTH_0.clb ~~~~ Loading resizeLN_C1_D0 Building source:./resizeLN_C1_D0_GeForce 8600 GT .clb ~~~~ Loading set_to_without_mask Building source:./set_to_without_mask_GeForce 8600 GT -D GENTYPE=int.clb ~~~~ Loading calc_sub_hist_D0 Building source:./calc_sub_hist_D0_GeForce 8600 GT .clb clCreateProgramWithSource status=0

clBuildProgram status=-11

BUILD LOG (0) Error: unsupported operation OpenCV Error: Gpu API call (CL_BUILD_PROGRAM_FAILURE) in openCLGetKernelFromSource, file /home/ovuser/OpenCV/opencv-2.4.6.1/modules/ocl/src/initialization.cpp, line 664 terminate called after throwing an instance of 'cv::Exception' what(): /home/ovuser/OpenCV/opencv-2.4.6.1/modules/ocl/src/initialization.cpp:664: error: (-217) CL_BUILD_PROGRAM_FAILURE in function openCLGetKernelFromSource

It seems the OpenCL compiler is unable to build calc_sub_hist_D0 kernel required by the face detect sample. I have put some verbose messages and attached kernel source causing the problem. Can someone point out what's wrong with the kernel source?

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answered 2013-10-10 14:03:19 -0500

arm gravatar image

Replacing GeForce 8600 GT with Quadro 600 board fixed the issue. I am quite new to OpenCL but It turned out GeForce 8600GT device does not support DOUBLE_SUPPORT hardware extension as well as atomic operations which are essential for some of the OpenCL kernels used in face detect sample. Hope this helps others!

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Asked: 2013-10-08 09:01:51 -0500

Seen: 608 times

Last updated: Oct 10 '13