[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Dmitry Karpeev]

Frequently, error control based on local norms is, in fact, preferred, isn't
it?

On Tue, Dec 7, 2010 at 1:50 PM, Jed Brown <jed at 59a2.org> wrote:

> On Tue, Dec 7, 2010 at 20:45, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>> Why can you not use VecAXPY() on the local Vecs?
>
>
> You're absolutely right.  I must have been thinking of error control when I
> decided this was a problem.  You need some sort of norms and don't want to
> double-count the ghost entries.
>
> Jed
>
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