Re: [Libmesh-users] PetscDMWrapper functionality (Salazar De Troya, Miguel)

[Boris B. <bor...@bu...>]

Hi Miguel,

Sorry, I should have responded to you earlier - you are correct, as it
currently stands the DMWrapper is incomplete in libMesh master, and for now
only serves as a placeholder for the rest of the implementation.

I have recently been working on finalizing details regarding some
fieldsplit capabilities in conjunction with the implementation, details
which we wish to iron out before the rest of the infrastructure is merged
into master. If you are interested in trying out the 'alpha' version and
have no need for the fieldsplit capabilities, you can check out my branch
which admittedly needs cleanup at this point, but should have the required
components. You can find it at :
https://github.com/bboutkov/libmesh/tree/gmg_master

If you do decide to try it, please note that it currently requires the user
to supply a pre-refined mesh hierarchy, and might change around a bit in
the near future.

Best of luck,
- Boris


Message: 1
> Date: Tue, 27 Nov 2018 17:58:35 +0000
> From: "Salazar De Troya, Miguel" <sal...@ll...>
> To: "Lib...@li..."
>         <Lib...@li...>
> Subject: [Libmesh-users] PetscDMWrapper functionality
> Message-ID: <40A...@co...>
> Content-Type: text/plain; charset="utf-8"
>
> Hello,
>
> I just wanted to ask if this capability (geometric multigrid in libMesh)
> is working properly before I dig deeper in the possible parameters for the
> PETSc mg. I?m trying to solve a linear elasticity problem with the settings:
>
> -ksp_type cg
> -pc_type mg
> -pc_mg_levels 3
> -pc_mg_galerkin
> -pc_mg_type full
>
> But I get a lof of iterations (>1000) in the linear solver. I do pass the
> options ?use_petsc_dm and ?node_major_dofs. I noticed this capability is
> still very new and that the number of levels seems to be limited to 1. Does
> that mean that I should not use it at all?
>
> Thanks
> Miguel
>
>
> Miguel A. Salazar de Troya
> Graduate Scholar, Lawrence Livermore National Laboratory
> Ph.D. Candidate, University of Illinois at Urbana-Champaign
> B141
> Rm: 1085-5
> Ph: 1(925) 422-6411
>
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