[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Jed Brown]

On Tue, Dec 7, 2010 at 22:06, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> But those that *want* to know, can obtain the underlying DM and start doing
> cool stuff
> to the Vec.   In particular, DM is the natural place to inject geometric
> information, generalizing DMDA to the unstructured
> case.  For example, a DM can allow to access the Vec data by "stencil",
> which in the DMDA case is the usual thing,
> and in the unstructured mesh case is, say, element restrictions.  This
> would encapsulate the "expanded space" idea
> that Jed described a while ago in a tentative unstructured API.  This would
> require, however, some iterator model,
> which is a kind of flexible local fine-granularity "on demand" scatter.
>

This functionality is all in Level 3 of my earlier message, it's not a part
of the DM API that Vec should be aware of.

The only parts of the DM API that I think Vec should be aware of is
PetscLayout, the "overlap" scatters, and DMVecView.   The last one is purely
cosmetic because VecGetDM, DMVecView is so common.

Jed
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