[petsc-dev] SNES, Coloring, DM, and TS

[Jed Brown]

On Tue, Feb 28, 2012 at 10:40, Matthew Knepley <knepley at gmail.com> wrote:

> Right now, DMs wrap up
>  - Domain Topology
>
 - Domain Geometry
>

These are nowhere in the DM interface.


>  - Modeling approximation (like function spaces, projectors)
>

This is only in the DM interface through coarsening and interpolation.


>  - Modeling equations (including decompositions, variable substitutions)
>

This is only in the DM interface with collective semantics. (For nonlinear
ASM, I would be in favor of getting a subdomain DM which would have
collective semantics on the subcommunicator instead of putting "local"
evaluation into the public interface.)


>
> and I may have forgotten some stuff. That is a huge amount of crap for one
> object.
>

You seem to be confusing the DM interface from a particular way of packing
data into an implementation of DM.
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