[petsc-users] Data transfer between DMDA-managed Vecs

[Dave May]

On Tue, 20 Apr 2021 at 01:06, Constantine Khrulev <ckhroulev at alaska.edu>
wrote:

> Hi,
>
> I would like to transfer values from one DMDA-managed Vec (i.e. created
> using DMCreateGlobalVector() or equivalent) to a Vec managed using a
> different DMDA instance (same number of elements, same number of degrees
> of freedom, *different* domain decomposition).
>
> What approach would you recommend?
>
>
VecScatter.


> Bonus question: what about DMDAs using different MPI communicators?
>

VecScatter. :D

We do exactly this in PCTELESCOPE using VecScatter.
It might be worth snooping through telescope_dmda.c which you can find here

https://www.mcs.anl.gov/petsc/petsc-current/src/ksp/pc/impls/telescope/telescope_dmda.c.html

Thanks,
Dave


> Thanks!
>
> --
> Constantine
>
>
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