[petsc-users] What exactly is the GlobalToNatural PetscSF of DMPlex/DM?

[Ferrand, Jesus A.]

Dear PETSc team:

Greetings.
I keep working on mesh I/O utilities using DMPlex.
Specifically for the output stage, I need a solid grasp on the global numbers and ideally how to set them into the DMPlex during an input operation and carrying the global numbers through API calls to DMPlexDistribute() or DMPlexMigrate() and hopefully also through some of the mesh adaption APIs. I was wondering if the GlobalToNatural PetscSF manages these global numbers. The next most useful object is the PointSF, but to me, it seems to only help establish DAG point ownership, not DAG point global indices.

Otherwise, I have been working with the IS obtained from DMPlexGetPointNumbering() and manually determining global stratum sizes, offsets, and numbers by looking at the signs of the involuted index list that comes with that IS. It's working for now (I can monolithically write meshes to CGNS in parallel), but it is resulting in repetitive code that I will need for another mesh format that I want to support.


Sincerely:

J.A. Ferrand

Embry-Riddle Aeronautical University - Daytona Beach - FL
Ph.D. Candidate, Aerospace Engineering

M.Sc. Aerospace Engineering

B.Sc. Aerospace Engineering

B.Sc. Computational Mathematics


Phone: (386)-843-1829

Email(s): ferranj2 at my.erau.edu

    jesus.ferrand at gmail.com
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