opencl - Workgroup Bound Check not working -

in opencl kernel i'm checking if global_id inside global problem size not working.

if global problem size dividable workgroupsize fine. if not, kernel doing nothing.

__kernel void move_points(const unsigned int points,                               const unsigned int floors,                               const unsigned int gridwidth,                               const unsigned int gridheight,                               __global const graphdata *graph,                               __global const float *pin_x,                               __global const float *pin_y,                               __global const float *pin_z,                               __global float *pout_x,                               __global float *pout_y,                               __global float *pout_z,                               __global clrngmrg31k3phoststream *streams) {     int id = get_global_id(0);      if (id < points) {         kernel things...     } } 

do know problem is?

thanks lot. robin.

if global size not divisible local size (workgroup size), kernel not run @ all.

the enqueuendrangekernel() call return cl_invalid_work_group_size error specified here.

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if want follow cuda mode, may have unused work items. put check in kernel (as have), , use bigger global size, multiple of local size.