[petsc-users] DMPlex shared node indexing

[Barry Smith]

   Actually, with DMPLEX the ghost vertices are not at the end of the local vector, they can be anywhere within the list. 

   But I have a work-in-progress branch https://gitlab.com/petsc/petsc/-/merge_requests/4542 <https://gitlab.com/petsc/petsc/-/merge_requests/4542> that labels the ghost locations and moves them to the end. You are welcome to try it.

  Barry


> On Nov 26, 2021, at 8:16 AM, Mark Adams <mfadams at lbl.gov> wrote:
> 
> First, ghost vertices only show up in "local" (vs "global") vectors and the ghost values are ordered after the locally owned ones.
> Others might have more to add.
> Mark
> 
> 
> On Fri, Nov 26, 2021 at 12:49 AM 袁煕 <yuanxi at advancesoft.jp <mailto:yuanxi at advancesoft.jp>> wrote:
> Dear PETSc-team,
> 
> When the mesh is distributed, the vertices are renumbered and some vertices are shared by neighboring CPUs. My question is:
> 
> 1. How to check which vertice is a ghost one?
> 2. Are those ghost vertices always at the end of vertices list? If not
> 3. Are there simple ways to let those ghost vertices come after owned ones?
> 
> Many thanks
> 
> Yuan

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