A Strategy for Automatic Performance Tuning of Stencil Computations on GPUs

Table 10

Heuristic performance on various input shapes.

	Z size
	NVIDIA					AMD
	8	16	32	64	128	8	16	32	64	128
Speedup
Hybrid oracle	1.11	1.20	1.20	1.17	1.16	1.27	1.26	1.34	1.52	1.50
Hybrid	1.08	1.20	1.20	1.17	1.16	0.95	1.10	1.26	1.48	1.50
Random sample	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Correct predictions	5	7	7	7	7	4	4	4	4	6