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Type: Posts; User: jonathan81

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  1. Re: CL_INVALID_WORK_GROUP_SIZE on MacOS 10.6.2 with ATI

    Hi,
    with a ATI RADEON 5870 i have the same problem (on NT)
    MAX WORK ITEM = 1024 but it works only with max size = 256
    I thinks it's just a bug in the AMD driver for the moment.
  2. Re: Time of clReleaseMemObject : strange behaviour

    @PaulS:
    I use a clFinish in my case. Just launch a profiler on the vectorAdd example and you will see that when you release your data or your commandQueue you have several memcpyDtoH which is...
  3. Re: Time of clReleaseMemObject : strange behaviour

    It's just the vectorAdd example without CPU computation and with a size of data = 512 * 100 000
    And just look the time of the function : clReleaseCommandQueue
    Thx
    J
  4. Re: Time of clReleaseMemObject : strange behaviour

    Hi,
    In fact you will see the same problem with the vectorAdd example in the SDK
    If you look the profiler you will see so many memcpyDtoH during the release of the memory
    Moreover, with big data...
  5. Replies
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    Re: OpenCL Books / tutorials

    Search OpenCL in Itunes there is a very good podcast
  6. Re: Time of clReleaseMemObject : strange behaviour

    Hi dbs2,
    Thanks for your help
    I use OpenCL SDK of NVIDIA 1.0
    However this SDK don't support for this moment CPU computation.
    I will try with AMD SDK on CPU (as soon as it will be available)
    I...
  7. Re: Time of clReleaseMemObject : strange behaviour

    Hi,
    Nobody finds that clreleasememobject takes many times of computation ?
    It's strange that i'm the only person with this problem
    Example :
    my code one 1 core CPU intel XEON 90sec
    with GTX 285...
  8. Re: Time of clReleaseMemObject : strange behaviour

    What's the link with my question ?
    i create the buffer + 1 kernel + 1 release
    Time of release is 0.2s (size : 50 * 500 000 * sizeof(float) ) !!! with one Kernel whereas is 0.01s without this kernel...
  9. Re: Time of clReleaseMemObject : strange behaviour

    Hi,
    If i take your idea to release memory on the buffer and on the device :
    Why the time of free memory on the device when i launch kernel is :0.19s =(0.20 - 0.01), it's huge
    I use OpenCL 1.0...
  10. Replies
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    3,088

    Re: Passing arrays of complex structures

    Yes ;)
  11. Time of clReleaseMemObject : strange behaviour

    Hi,
    I have a strange behaviour with time of computing with function clReleaseMemObject
    First example


    float *pfTest = (float *)calloc(50 * 500000, sizeof(float));
    cl_mem *clTest =...
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