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

Table 6

RES, CPU(s), and IT for PMHSS and GPMHSS with 𝑉=𝑊−𝑇 and 𝑚=16.

	𝜎2
	10	50	80	100
GPMHSS
RES	9.8506𝑒−7	9.4015𝑒−7	8.9127𝑒−7	9.4832𝑒−7
CPU(s)	0.031	0.046	0.046	0.063
IT	20	21	24	29
DGPMHSS
RES	9.3425𝑒−7	7.2018𝑒−7	7.4847𝑒−7	8.9905𝑒−7
CPU(s)	0.031	0.032	0.031	0.031
IT	20	20	20	19