[petsc-users] DMPlex problem

[Mark Lohry]

Regarding DMPlex, I'm unclear on the separation between Index Sets and 
Plex for unstructured solvers. I've got an existing unstructured serial 
solver using petsc's newton-krylov solvers. Should I be looking to 
parallelize this via IS or plex? Is there an interface for either that 
allows me to specify the partitioning (e.g. by metis' output)? Last but 
not least, is there a working example of dmplex in the docs? The only 
unstructured code example I see in the docs is SNES ex10, which uses IS.

Thanks,

Mark


On 09/09/2016 04:21 AM, Matthew Knepley wrote:
> On Fri, Sep 9, 2016 at 4:04 AM, Morten Nobel-Jørgensen <mono at dtu.dk 
> <mailto:mono at dtu.dk>> wrote:
>
>     Dear PETSc developers and users,
>
>     Last week we posted a question regarding an error with DMPlex and
>     multiple dofs and have not gotten any feedback yet. This is
>     uncharted waters for us, since we have gotten used to an extremely
>     fast feedback from the PETSc crew. So - with the chance of
>     sounding impatient and ungrateful - we would like to hear if
>     anybody has any ideas that could point us in the right direction?
>
>
> This is my fault. You have not gotten a response because everyone else 
> was waiting for me, and I have been
> slow because I just moved houses at the same time as term started 
> here. Sorry about that.
>
> The example ran for me and I saw your problem. The local-tp-global map 
> is missing for some reason.
> I am tracking it down now. It should be made by DMCreateMatrix(), so 
> this is mysterious. I hope to have
> this fixed by early next week.
>
>   Thanks,
>
>     Matt
>
>     We have created a small example problem that demonstrates the
>     error in the matrix assembly.
>
>     Thanks,
>     Morten
>
>
>
>
>
> -- 
> 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

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