[petsc-dev] Need mechanism to set LocalToGlobal mapping in a DMShell

[Richard Tran Mills]

I think that adding DMLocalToLocalBegin/End makes sense from a consistency 
standpoint.  Should this be done by adding localtolocalbegin/end pointers 
to dm->ops?

--Richard

On 2/21/13 4:35 PM, Barry Smith wrote:
> On Feb 21, 2013, at 3:31 PM, Richard Tran Mills <rtm at eecs.utk.edu> wrote:
>
>> I will add DMShellSetGlobalToLocal (and DMShellSetLocalToGlobal).
>>
>> One other thing: We also need to be do LocalToLocal operations. For the structured grid case, we call DMDALocalToLocalBegin/End, and for the unstructured grid case we construct our own VecScatter context essentially just how it is done in daltol.c for DMDA.  Is there a good reason that there is no DMLocalToLocalBegin/End?
>    I don't think so. Just laziness in not moving them over when DM was created from DA. You can add them.
>
>     Barry