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

Table 7

RES, CPU(s), and IT for PMHSS and GPMHSS with 𝑉=𝑊−𝑇 and 𝑚=24.

	𝜎2
	10	50	80	100
GPMHSS
RES	9.8907𝑒−7	9.6059𝑒−7	9.7633𝑒−7	7.5427𝑒−7
CPU(s)	0.094	0.094	0.11	0.125
IT	20	21	24	29
DGPMHSS
RES	9.5055𝑒−7	9.5856𝑒−7	7.8461𝑒−7	7.6081𝑒−7
CPU(s)	0.078	0.078	0.094	0.094
IT	20	20	21	20