[petsc-users] PCMG: level dependent smoothing steps

[Patrick Sanan]

Will it work for you to use

https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCMGGetSmoother.html

to pull out the KSP for the level you're interested in (Note link to
PCMGGetSmootherDown() if you want to control up and down smoothers
separately) and then use

https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetTolerances.html

to set the maximum iterations?

Am Di., 19. Feb. 2019 um 16:07 Uhr schrieb Pietro Benedusi via petsc-users <
petsc-users at mcs.anl.gov>:

> 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.
>
> Thank you!
> Pietro
>
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