The performance portability of OpenCL kernel implementations for common
memory bandwidth limited linear algebra operations across different hardware
generations of the same vendor as well as across vendors is studied. Certain
combinations of kernel implementations and work sizes are found to exhibit good
performance across compute kernels, hardware generations, and, to a lesser
degree, vendors. As a consequence, it is demonstrated that the optimization of
a single kernel is often sufficient to obtain good performance for a large
class of more complicated operations.Comment: 11 pages, 8 figures, 2 tables, International Workshop on OpenCL 201
