opencl

You discover these values experimentally for your algorithm. Use a profiler to get hard numbers. I like to use CL_DEVICE_MAX_COMPUTE_UNITS as the number of work groups, because I often rely on synchronizing work items. I usually run kernels with little branching, so the take the same time to execute in each compute unit. Some multiple … Read more

As you have stated, barriers may only synchronize threads in the same workgroup. There is no way to synchronize different workgroups in a kernel. Now to answer your question, the specification was not clear to me either, but it seems to me that section 6.11.9 contains the answer: CLK_LOCAL_MEM_FENCE – The barrier function will either … Read more