[ET Trac] [Einstein Toolkit] #1238: implement buffer mask in CarpetEvolutionMask

[Einstein Toolkit]

#1238: implement buffer mask in CarpetEvolutionMask
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  Reporter:  rhaas        |       Owner:  eschnett           
      Type:  enhancement  |      Status:  review             
  Priority:  minor        |   Milestone:                     
 Component:  Carpet       |     Version:                     
Resolution:               |    Keywords:  CarpetEvolutionMask
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Comment (by anonymous):

 I was half hoping to provoke someone with Carpet internal knowledge to
 look at it (Erik however said he'd be busy today so I only threatened to
 commit on Sunday). I'll hold of for proper please apply. :-)

 The buffer calculation is copied out of dh::regrid.cc so is hopefully
 consistent with what Carpet uses for its communication schedule.

 Being able to control storage might be useful yes. I had briefly thought
 about it and then rejected it due to causing too many new parameters to be
 around ("if you don't want the masks, don't activate the mask thorn").
 Adding a parameter is simple enough though. I will likely make the
 parameter default to "yes" though since likely if you benefit from the
 evolution mask you also benefit from the buffer mask (the buffers do show
 up as "evolved" points in the evolution mask since at least for some RK
 substeps their RHS needs to be evaluated and the results their would show
 up in the restricted output [via the stencils]).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1238#comment:5>
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