A Double-Parameter GPMHSS Method for a Class of Complex Symmetric Linear Systems from Helmholtz Equation

Table 5

RES, CPU(s), and IT for PMHSS and GPMHSS with 𝑉=𝑊−𝑇 and 𝑚=8.

	𝜎2
	10	50	80	100
GPMHSS
RES	9.818𝑒−7	9.8917𝑒−7	9.1469𝑒−7	6.306𝑒−7
CPU(s)	0.015	0.016	0.016	0.016
IT	20	21	24	30
DGPMHSS
RES	9.0916𝑒−7	7.0211𝑒−7	4.9072𝑒−7	6.5183𝑒−7
CPU(s)	0.015	0.015	0.015	0.013
IT	20	19	18	17