MINRES Seed Projection Methods for Solving Symmetric Linear Systems with Multiple Right-Hand Sides

Table 4

Convergent iterative steps of each system and CPU time (second).

𝐵	𝐴	Minres seed projection method		Minres2
		Iterative steps	T1 (s)	Iterative steps	T2 (s)
𝐵1	bcsstm9	(718) 171, 146, 179, 129, 93	3.13	(980) 171, 201, 241, 191, 176	5.77
	bcsstk27	(781) 211, 187, 154, 124, 105	11.82	(1033) 211, 206, 203, 203, 210	24.98
	bcsstk22	(1833) 984, 574, 142, 119, 14	4.32	(4705) 984, 935, 850, 1014, 922	16.82
𝐵2	bcsstm9	(475) 175, 124, 62, 68, 46	2.24	(898) 175, 201, 175, 176, 171	5.37
	bcsstk27	(748) 215, 156, 143, 140, 94	11.34	(1079) 215, 216, 216, 216, 216	25.85
	bcsstk22	(2312) 1019, 590, 393, 162, 148	5.33	(5231) 1019, 986, 1079, 1059, 1088	18.85