Comparison of Algebraic Multigrid Preconditioners for Solving Helmholtz Equations

Table 4

Computational performance of Bi-CGSTAB with DPAP.

𝑘	DPAP(𝑇_𝑂)			DPAP(𝐹_𝑂)
	Iter	𝑇_setup(s)	𝑇_solve(s)	Iter	𝑇_setup(s)	𝑇_solve(s)
10	3	0.968	0.547	3	0.922	0.453
20	3	2.938	0.531	2	3.313	0.421
30	2	9.031	0.578	3	10.844	0.812
40	3	22.828	1.265	4	29.969	1.703
50	4	57.391	2.859	3	70.594	2.125
60	3	113.17	3.344	11	144.844	12.032
70	4	202.578	7.000	6	273.75	14.375
80	3	339.531	7.547	5	453.469	12.281
90	4	561.031	13.766	8	723.343	40.765

Note: presmooth = 1, postsmooth = 1, smoother = ILU, setup_Alg = dpagg, 𝑉_cycle.