[ET Trac] [Einstein Toolkit] #1614: introduce "damage region" to speed up SYNC after restriction

[Einstein Toolkit]

#1614: introduce "damage region" to speed up SYNC after restriction
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 Reporter:  rhaas        |       Owner:  eschnett           
     Type:  enhancement  |      Status:  new                
 Priority:  major        |   Milestone:                     
Component:  Carpet       |     Version:  development version
 Keywords:               |  
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 after a restriction one needs to apply boundary conditions and SYNC the
 grid functions. This SYNCS (as far as I know) the whole grid function.
 However for a restriction only a (hopefully small) number of grid points
 should be affected.

 It may thus make sense if Carpet were to exchange only the data that needs
 to be exchanged.

 This seems to be not quit trivial to implement though since one has to
 translate from the send region to the recv region in the sendrecvs.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1614>
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