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

Table 8

RES, CPU(s), and IT for PMHSS and GPMHSS with 𝑉=𝑊−𝑇 and 𝑚=32.

	𝜎2
	10	50	80	100
GPMHSS
RES	9.9181𝑒−7	9.8976𝑒−7	6.0829𝑒−7	9.1273𝑒−7
CPU(s)	0.172	0.172	0.203	0.235
IT	20	21	25	28
DGPMHSS
RES	9.5956𝑒−7	5.5697𝑒−7	5.6167𝑒−7	5.5736𝑒−7
CPU(s)	0.156	0.156	0.187	0.172
IT	20	20	22	21