[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Dmitry Karpeyev]

Yes, but how is the local form defined?  Do you suggest that every Vec carry
a scatter from the global to the local form?
That appears to be a necessarily geometric (maybe in the abstract sense)
notion of restricting to some subdomain, which
might involve degrees of freedom not currently owned locally, and which
become "ghosts".

On Tue, Dec 7, 2010 at 2:24 PM, Jed Brown <jed at 59a2.org> wrote:

> On Tue, Dec 7, 2010 at 21:20, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>> In other words all parallel Vecs could have related local forms and the
>> model is "give me local form Vec", scatter to/from local form vec etc?
>
>
> The only consequence I can think of is that simultaneously manipulating the
> global and local forms could not be allowed (in a manageable way).  But I
> think any need to do that is an obscure edge case.
>
> Jed
>
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