Comparison of Algebraic Multigrid Preconditioners for Solving Helmholtz Equations

Table 3

Computational performance of Bi-CGSTAB with SAP.

𝑘	SAP (𝑇_𝑂)			SAP (𝐹_𝑂)
	Iter	𝑇_setup (s)	𝑇_solve (s)	Iter	𝑇_setup (s)	𝑇_solve (s)
10	5	4.484	0.328	5	4.391	0.265
20	7	72.718	0.500	5	72.516	0.391
30	4	417.172	0.672	4	419.953	0.703
40	6	3114.88	14.578	6	1586.28	6.375

Note: presmooth = 0, postsmooth = 1, smoother = ILU, setup_Alg = sagg, 𝑉_cycle.