[petsc-users] Hypre BoomerAMG settings options database

[Barry Smith]

  Yes, the handling of BoomerAMG options starts at line 365. If we don't support what you want but hypre has a function call that allows one to set the values then the option could easily be added to the PETSc options database here either by you (with a merge request) or us. So I would say check the hypre docs.

  Just let us know what BoomerAMG function is missing from the code.

  Barry


> On Jan 5, 2024, at 7:52 AM, Khurana, Parv <p.khurana22 at imperial.ac.uk> wrote:
> 
> Hello PETSc users community,
>  
> Happy new year! Thank you for the community support as always.
>  
> I am using BoomerAMG for my research, and it is interfaced to my software via PETSc. I can only use options database keys as of now to tweak the settings I want for the AMG solve.
>  
> I want to control the number of smoothener iterations at pre/post step for a given AMG cycle. I am looking for an options database key which helps me control this. I am not sure whether this is possible directly via the keys (Line 365: https://www.mcs.anl.gov/petsc/petsc-3.5.4/src/ksp/pc/impls/hypre/hypre.c.html). My comprehension of the current setup is that I have 1 smoothener iteration at every coarsening step. My aim is to do two pre and 2 post smoothening steps using the SSOR smoothener.
>  
> BoomerAMG SOLVER PARAMETERS:
>  
>   Maximum number of cycles:         1 
>   Stopping Tolerance:               0.000000e+00 
>   Cycle type (1 = V, 2 = W, etc.):  1
>  
>   Relaxation Parameters:
>    Visiting Grid:                     down   up  coarse
>             Number of sweeps:            1    1     1 
>    Type 0=Jac, 3=hGS, 6=hSGS, 9=GE:      6    6     9 
>    Point types, partial sweeps (1=C, -1=F):
>                   Pre-CG relaxation (down):   1  -1
>                    Post-CG relaxation (up):  -1   1
>                              Coarsest grid:   0
>  
> PETSC settings I am using currently: 
>  
> -ksp_type preonly
> -pc_type hypre
> -pc_hypre_type boomeramg
> -pc_hypre_boomeramg_coarsen_type hmis
> -pc_hypre_boomeramg_relax_type_all symmetric-sor/jacobi
> -pc_hypre_boomeramg_strong_threshold 0.7
> -pc_hypre_boomeramg_interp_type ext+i
> -pc_hypre_boomeramg_P_max 2
> -pc_hypre_boomeramg_truncfactor 0.3
>  
> Thanks and Best
> Parv Khurana

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