opencl Kernel Basics Kernel ID
Example
To properly work with the data each thread needs to know its position in the threadblock/global thread pool. This can be archieved with
get_local_id($dim);
get_global_id($dim);
Those two functions return the position of the thread relative to the threadblock or all threads.
get_working_dim();
Gets the total number of dimensions the kernel was launched with.
get_local_size($dim);
get_global_size($dim);
Gets the total number of threads in the threadblock or in total for a given dimension.
Caveat: make always sure that your thread is not exceeding your data size. This is very likely to happen and should always be checked for.
