[petsc-dev] DMPlex with vertical numbering?

[Jed Brown]

Michael Lange <michael.lange at imperial.ac.uk> writes:

> Hi Matt,
>
> Thanks for the clarification, this does make sense. I have achieved the 
> local DoF ordering I want by only permuting the offsets in the created 
> section. However, I am now trying to extract the according halo exchange 
> information from the associated PetscSF object and, although the local 
> leafs have been renumbered according to my permutation, the roots they 
> are connected to have not been updated. Is there an easy way to update 
> the roots or re-initialise the PetscSF from the reordered section?

You can SFBcast the new root numbers and create a new SF.

Since this is a somewhat common operation that can be optimized by the
SF implementation, it may make sense to provide PetscSFMoveRoots() or
some such.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 835 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20131112/fbbe55ac/attachment.sig>