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Thread: clGetDeivceIDs fails...driver issue?

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  1. #1
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    Join Date
    Jul 2013
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    1

    Exclamation clGetDeivceIDs fails...driver issue?

    Hi All,

    I have been developing code for openCL for the past month or so and I have a large codebase running on a Mac. I need to port that code to Windows and have been using this: https://github.com/jasonjtyler/OpenCLProjects
    as a test project to get something going in Visual Studio (and essentially confirm all the basics are working).

    System Stats:
    1. Core i7 (Ivy Bridge)
    2. Intel Integrated gfx and AMD Radeon HD 8700M
    3. (for more details it is a Samsung Series 7 Chronos Model #NP780Z5E)
    4. Windows 8 (OS)

    I have had no such luck getting the basics working. I have used GPU-Z to ensure the driver/HW does support OpenCL. GPU-Z does confirm that AMD does support OpenCL. The Intel driver does not support openCL (according to Intel's driver check applet it is a custom Samsung version of the driver).


    If you look at the OpenCLProjects github you will see two visual studio projects:
    1) OpenCL.GetParameterInfo - This fully works. It shows both the Intel and AMD devices.
    2) OpenCL.SimpleKernal --This fails on the clGetDeviceIDs call. It returns error code -1 (CL_DEVICE_NOT_FOUND).

    Not sure why it is failing. It should be able to execute on the AMD device. Could someone please help? Thank you very much.

    If I have failed to provide enough information please let me know what I could provide to help. I really need to get OpenCL working on Windows/Visual Studio.

    Thank You,
    George

  2. #2
    Newbie
    Join Date
    Jul 2013
    Posts
    10
    Maybe it fails because you have two platforms installed (Intel and AMD). Your code takes the first platform returned by clGetPlatformID, and tries to get a GPU device. If the first platform on the list is Intel and has only a CPU device, it makes sense that it fails.

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