Parallel RFSAI-BFGS Preconditioners for Large Symmetric Eigenproblems

Table 9

Iterations, timings, and pseudo efficiencies for problem GEO-1438.

𝑝	precond	DACG		Newton		Total		𝐸𝑝^(32)
	CPU	CPU	MVP	CPU	MVP	CPU	MVP
32	23.87	289.92	5002	358.20	5432	671.99	10434
64	13.16	139.61	5002	172.14	5439	324.91	10441	1.03
128	7.66	80.15	5002	97.98	5427	185.79	10429	0.90
256	5.38	49.86	5002	61.66	5431	116.90	10433	0.72
512	6.82	37.78	5002	47.31	5429	91.91	10431	0.46