A Strategy for Automatic Performance Tuning of Stencil Computations on GPUs

Table 9

Heuristic performance on various input sizes.

	Data size per dimension
	NVIDIA					AMD
	32	64	128	256	512	32	64	128	256	512
Speedup
Hybrid oracle	1.03	1.04	1.15	1.18	1.19	0.98	0.93	1.12	1.07	1.36
Hybrid	0.97	1.04	1.15	1.18	1.19	0.85	0.91	1.11	1.06	1.39
Random sample	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Correct predictions	2	7	7	7	7	3	3	6	6	6