[petsc-users] PCMG: level dependent smoothing steps

[Matthew Knepley]

On Tue, Feb 19, 2019 at 10:07 AM Pietro Benedusi via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Dear PETSc team,
>
> Is there a way to set the number of smoothing steps done inside a specific
> multigrid level l ?
> Something like:
>
> PCMGSetNumberSmoothDown <https://www.mcs.anl.gov/petsc/petsc-3.8/docs/manualpages/PCMG/PCMGSetNumberSmoothDown.html#PCMGSetNumberSmoothDown>(PC <https://www.mcs.anl.gov/petsc/petsc-3.8/docs/manualpages/PC/PC.html#PC> pc,PetscInt <https://www.mcs.anl.gov/petsc/petsc-3.8/docs/manualpages/Sys/PetscInt.html#PetscInt> n, PetscInt <https://www.mcs.anl.gov/petsc/petsc-3.8/docs/manualpages/Sys/PetscInt.html#PetscInt> l)
>
>
> In this way I could, for example set 3 smoothing steps on level 1 and 7
> smoothing steps on level 2.
>

-mg_level_1_ksp_max_it 3 -mg_level_2_ksp_mat_it 7

  Thanks,

     Matt


> Thank you!
> Pietro
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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