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

Table 9

Convergence results for the IDGPMHSS iteration with 𝑚=24.

(𝛼^∗𝐺,𝛽^∗𝐺)	𝜎2	𝜏=0.95			𝜏=0.9			𝜏=0.85
		it.s	avg1	avg2	it.s	avg1	avg2	it.s	avg1	avg2
(1.1, 1)	10	51	20.9	18.2	68	26.1	23.7	84	30.4	28.3
(1.5, 1)	50	54	23.5	18.3	70	28.0	23.9	86	33.0	28.4
(2.2, 1)	80	57	25.0	20.1	72	30.0	25.3	88	34.2	30.0
(1.8, 1)	100	58	27.5	18.9	74	31.9	24.3	89	36.1	28.7