[ET Trac] [Einstein Toolkit] #1375: Slab does not fill in outmost layer of points in mesh refinement levels

[Einstein Toolkit]

#1375: Slab does not fill in outmost layer of points in mesh refinement levels
------------------------------------+---------------------------------------
  Reporter:  rhaas                  |       Owner:                     
      Type:  defect                 |      Status:  new                
  Priority:  minor                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  Slab               
------------------------------------+---------------------------------------

Comment (by rhaas):

 Yes, my argument is based in precisely this difference in calling the
 outermost layer ghost points or buffer zones (naturally Carpet is the
 ultimate authority there so, I should really refer to them as ghost
 points). I should not have put this statement in the ticket though, since
 really it does not matter what these points are called.

 The statement should have been that slab seems to properly fill in all
 interprocessor ghost points but not the layer of ghost points at the
 outermost region of a refinement level.

 My actual usage case is that I want to get a full copy of all data on the
 grid with x->-x,y->-y,z->-z (ie all coordinates flipped), to check issues
 related to the center of mass. So what I have to do is: (1) make sure that
 I have a fully synched source grid function (2) call Slab_Transfer with
 useghosts=1, yes? If of course I do this in the middle of a RHS evaluation
 (where the ghosts and symmetry and boundary points are invalid for some
 time) I can just use useghosts=0 and manually clear the outermost layer to
 avoid nan/large values popping up in the output.

 So you consider this actually something that needs to be fixed? I had not
 really seen it as such but only as something that should be documented.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1375#comment:3>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit