8 Replies Latest reply on Jan 10, 2011 8:06 AM by pulec

    What does influence kernel's maximal work-group size?

    pulec
      Hi, I'd be interested wheather anyone knows what influences kernel's maximal work-group size. I know it could be the number of needed registers or LDS for kernel. But, can me anyone explain, why is such a simple kernel as listed limited to only 32 work-items per work-group (for my card, maximal w-g size is 128, and is indeed allowed for other, more complex, kernels)?
      EDIT: The code is meant just as an example, there won't be obviously any benefit from using more work-items per w-g. But I have some other kernels that could benefit from more w-i per w-g. I'd only like to know what could cause the reduction of allowed w-g size.

      __kernel void mem_clear(__global float *array, int n) { if(get_global_id(0) < n) array[get_global_id(0)] = 0; }