[Dune-devel] Grid-Entity ownership in distributed ALUGrid or UGGrid

[Dominic Kempf]

Hey Simon, hey Oliver,

YaspGrid does of course have adjacency information available, but it is
hidden very deep down in an implementation
detail data structure (namely YGridList::Intersection). How hard it is to
extract that information depends a bit on how
exactly the interface proposal looks like. I would try not to precompute
the information, because we generally don't
store O(entities) information in YaspGrid.

Best,
Dominic

On Mon, Oct 11, 2021 at 4:44 PM Oliver Sander <oliver.sander at tu-dresden.de>
wrote:

> Hi Simon,
>
> > My question is: can the information about entity ownership, or the set
> of other ranks an entity belongs to, be extracted in the specific
> implementation of some grids, e.g. ALUGrid, or UGGrid, or YaspGrid, or
> SPGrid, maybe also in the ParallelGrid meta-grid wrapper? Without
> additional communication?
>
> this information is readily available within the UGGrid implementation.
> I do agree with you that making it officially available somehow
> would be a good idea.
>
> Best,
> Oliver
>
>
>
>   If so, maybe we could discuss a common interface and develop a utility
> for dune-grid to easily provide this information. A fallback implementation
> can be provided using communication and is part of the implementation
> details of GlobalIndexSet of dune-grid. I think, this is a necessary
> utility for implementing parallel frameworks on top of the grid module,
> without reinventing the wheel.
> >
> > Best regards,
> > Simon
> >
> >
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