[petsc-users] Consistent domain decomposition between DMDA and DMPLEX

[Mark Adams]

Matt is the authority here but I think you are going to start with:

https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/PetscPartitionerRegister.html

Then you would clone a "setType" method, which will for one set the
partition function. You can cache data like the regular grid metadata in
here and then your partitioner function will pick the processor that each
local vertex belongs to.

Mark

On Fri, Mar 22, 2019 at 2:20 AM Swarnava Ghosh via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Dear PETSc users and developers,
>
> I am new to DMPLEX and had a query regarding setting up a consistent
> domain decomposition of two meshes in PETSc.
> I have a structured finite difference grid, managed through DMDA. I have
> another unstructured finite element mesh managed through DMPLEX. Now all
> the nodes in the unstructured finite element mesh also belong to the set of
> nodes in the structured finite difference mesh (but not necessarily
> vice-versa), and the number of nodes in DMPLEX mesh is less than the number
> of nodes in DMDA mesh. How can I guarantee a consistent domain
> decomposition of the two meshes? By consistent, I mean that if a process
> has a set of nodes P from DMDA, and the same process has the set of nodes Q
> from DMPLEX, then Q is a subset of P.
>
> I look forward to your response.
>
> Sincerely,
> Swarnava
>
>
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