Generalized Preconditioned MHSS Method for a Class of Complex Symmetric Linear Systems

Table 4

RES, CPUs, and IT for MHSS, PMHSS, and GPMHSS with 𝑃=𝑃₁=𝑃₂=𝑇.

	𝑚	8×8	16×16	24×24	32×32
MHSS	RES	9.733𝑒−7	9.388𝑒−7	9.337𝑒−7	9.369𝑒−7
	CPU(s)	0.015	0.828	7.422	42.328
	IT	46	75	99	120
PMHSS	RES	7.003𝑒−7	6.959𝑒−7	6.901𝑒−7	6.857𝑒−7
	CPU(s)	0.015	0.047	0.14	0.25
	IT	31	31	31	31
	Speed-up	1	17.62	53.01	169.31
GPMHSS	RES	7.340𝑒−7	5.868𝑒−7	6.583𝑒−7	6.623𝑒−7
	CPU(s)	0.015	0.031	0.078	0.172
	IT	14	18	20	21
	Speed-up	1	26.71	95.15	246.09