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

Table 3

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

	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	6.585𝑒−7	6.530𝑒−7	6.473𝑒−7	6.429𝑒−7
	CPU(s)	0.015	0.062	0.141	0.281
	IT	31	31	31	31
	Speed-up	1	13.35	52.64	150.63
GPMHSS	RES	7.884𝑒−7	8.197𝑒−7	8.210𝑒−7	8.032𝑒−7
	CPU(s)	0.015	0.032	0.094	0.219
	IT	18	19	20	21
	Speed-up	1	25.88	78.96	193.28