[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Jed Brown]

On Tue, Dec 7, 2010 at 21:20, Barry Smith <bsmith at mcs.anl.gov> wrote:

> How with the DMDA could you have a no copy and still allow nice 2 d and 3d
> array access of ghost points? It seems to me with DMDA you would always need
> a copy (or some crazy overloading of [])?
>

Indeed, you would need overloading which I'm not proposing.


> Or do you mean in the DMDA case you get a copy but in the unstructured grid
> case you get no copy, but the basic paradigm of "local form" is always used?
>

Yeah, I just want a uniform API.


>  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?
>

Yes.
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