[petsc-dev] Add natural-to-global and global-to-natural operations for DM?

[Barry Smith]

On Mar 7, 2013, at 9:46 PM, Richard Tran Mills <rtm at eecs.utk.edu> wrote:

> Continuing on my quest to be able to wrap all of the unstructured grid operations in PFLOTRAN inside a DM: Would it be OK to add DMGlobalToNaturalBegin()/End() and DMNatualToGlobalBegin()/End()? These are currently DMDA routines, not DM ones.  We do something that we call natural-to-global and global-to-natural operations with our unstructured grid cases in PFLOTRAN (though I'm not sure if "natural" is quite the thing to call it... I always think of that in terms of a structured grid layout).  I would like to just call DMGlobalToNaturalBegin()/End(), etc., on our DM, whether it is a DMDA or a DMShell.
> 
> I had already mentioned that I plan to add DM interface routines for local-to-local operations.  I am thinking that global-to-natural, etc., also ought to be added, though I'm not sure if the concept of "natural" ordering necessarily makes sense in some cases.

   What does natural mean for you on anything but a DA in what you do with pflotran? Once we all understand than we can come up with ideas on how that fits with DM.

   Barry

> 
> --Richard
> 
> -- 
> Richard Tran Mills, Ph.D.
> Computational Earth Scientist      | Joint Assistant Professor
> Hydrogeochemical Dynamics Team     | EECS and Earth & Planetary Sciences
> Oak Ridge National Laboratory      | University of Tennessee, Knoxville
> E-mail: rmills at ornl.gov  V: 865-241-3198 http://climate.ornl.gov/~rmills
>