[petsc-dev] FAS with TS

[Jed Brown]

On Wed, Feb 8, 2012 at 08:57, Matthew Knepley <knepley at gmail.com> wrote:

> I just want to point out that Jed envisions that coefficients (and maybe
> subproblems, etc) cannot be accommodated on the
> same DM. I agree. However, this silly idea that we can make DMs all over
> the place with no cost, like DAs, if they contain
> all the mesh information, is just wrong. I think this is a good argument
> for having both a topology object and a DM handling
> layout/solver information. What is the counter-argument?
>

Why can't we have multiple DMs that internally share topology? Then each
implementation can share or not share as much as they like. Some DMs might
also share topological information between levels. I don't think it makes
sense to encode a specific sharing model into the type system.
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