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Thread: clEnqueueNDRangeKernel max global_work_size

  1. #11
    Senior Member
    Join Date
    Nov 2009

    Re: clEnqueueNDRangeKernel max global_work_size

    In NVIDIA OpenCL guide we can read :
    The maximum size of each dimension of a grid of thread blocks is 65535;
    So there is a limitation, fixed by nVidia, which is'nt define by specification and that we can't query with API... This constraint limits a bit the portability

  2. #12
    Senior Member
    Join Date
    Jul 2009
    Northern Europe

    Re: clEnqueueNDRangeKernel max global_work_size

    It is strange that you can use arbitrary sizes on Nvidia cards on MacOS X but not with Nvidia's own drivers. All they would have to do is breakup the runtime kernel execution into 65k sized chunks since each execution is necessarily independent.

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