> On 18 Nov 2020, at 15:26, Zhang, Hong via petsc-dev <[email protected]>
> wrote:
>
> Matt or Jed,
> Can I call PetscSectionAddDof(s,p,ndof) at a shred 'p' by more than one
> processors? For example,
> if (rank == 0) {
> PetscSectionAddDof(s,p,1) ;
> } else if (rank == 1) {
> PetscSectionAddDof(s,p,2) ;
> }
> Then, at shared 'p', section 's' has dof=3?
Sections are "local" objects that are tied together by an SF that describes
point ownership.
So I think that the only thing you need is that if two processes set a dof on
what is globally the same point, they should agree on how many dofs live there.
I wonder if PetscSectionAddDof (etc...) should be marked as logically
collective.
Lawrence
