[petsc-users] Definition of threshold(s) in gamg and boomerAMG

[Edoardo Centofanti]

Hi PETSc users,

I was looking for the exact definitions of the threshold parameter
(-pc_gamg_threshold) for gamg and of the strong threshold
(-pc_hypre_boomeramg_strong_threshold) for Hypre BoomerAMG. My curiosity
comes from the fact that the suggested parameters (apparently acting on the
same aspect of the algorithms) differ of around one order of magnitude (if
I remember right from the PETSc manual, the gamg threshold for 3D problems
is around 0.05, while for boomerAMG ranges from 0.25 to 0.5).

Thank you in advance,
Edoardo
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