Parallel RFSAI-BFGS Preconditioners for Large Symmetric Eigenproblems

Table 8

Iterations, timings, and pseudo efficiencies for problem LONG-1103.

𝑝	precond	DACG		Newton		Total		𝐸𝑝^(32)
	CPU	CPU	MVP	CPU	MVP	CPU	MVP
32	24.87	127.47	2734	346.87	5972	499.20	8706
64	15.16	68.12	2734	172.24	5823	255.52	8557	0.97
128	8.57	42.90	2734	109.31	5928	160.78	8662	0.78
256	5.12	31.10	2734	77.41	5806	113.63	8540	0.55