[Users] Carpet version of cctk_bbox?

[Scott Hawley]

Ok.  I'll find you on Skype if necessary.  My existing routine does separate inter-processor syncs from prolongation operations; they run at different steps in the algorithm.  However, it may not be a problem to do them all at once. I'll try it and see...

--
Scott H. Hawley, Ph.D. 
Assistant Professor of Physics
Belmont University.  
615-460-6206.
Sent from my iPad

On Apr 9, 2012, at 9:39 AM, "Erik Schnetter" <schnetter at cct.lsu.edu> wrote:

> The routine that Roland describes determines what kind of boundary a
> boundary is -- inter-processor, symmetry boundary, outer boundary,
> etc., but unfortunately does not distinguish between mesh refinement
> boundaries and inter-process ghost zones. The reason is that a given
> boundary may be both. Consider an L-shaped refined region consisting
> of two rectangular component. Where they touch, ghost zones are filled
> by copying from the other component, elsewhere, they are filled via
> prolongation from the next coarser grid.
> 
> Therefore, the distinction between inter-process and mesh refinement
> boundaries is hidden from the application, and synchronization applies
> both kinds of boundary conditions.
> 
> To determine the details, you can query Carpet about which region of a
> component are filled by synchronization and which are filled by
> prolongation; however, there is no one-to-one connection to what
> Cactus calls a "face" of a grid.
> 
> Let's discuss on Skype, which should be easier than email.
> 
> -erik
> 
> On Mon, Apr 9, 2012 at 10:12 AM, Roland Haas
> <roland.haas at physics.gatech.edu> wrote:
>> Hello  Scott,
>> 
>>>   For my elliptic solver, I need to know not only if a given grid boundary is an outer boundary or not, I need to know if it's an inter-processor boundary or a mesh refinement boundary.
>>> cctk_bbox does not provide the latter distinction.  Is there something analogous provided by Carpet?
>> GenericFD's GenericFD_GetBoundaryInfo routine (in Kranc, see
>> https://github.com/ianhinder/Kranc/blob/6bed8e74aac5bd1e76f2e7a4d8efcf166a60c6e6/Auxiliary/Cactus/KrancNumericalTools/GenericFD/src/GenericFD.c)
>> will do this for you. I believe there was discussion at one point to
>> move this functionality into the flesh but cannot find the thread right now.
>> 
>> Yours,
>> Roland
>> 
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> 
> 
> -- 
> Erik Schnetter <schnetter at cct.lsu.edu>
> http://www.perimeterinstitute.ca/personal/eschnetter/
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