[ET Trac] [Einstein Toolkit] #971: global-early, loop-local routines in PostRegrid cause access to elements outside of a vector capacity

[Einstein Toolkit]

#971: global-early, loop-local routines in PostRegrid cause access to elements
outside of a vector capacity
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  Reporter:  rhaas   |       Owner:  eschnett
      Type:  defect  |      Status:  new     
  Priority:  major   |   Milestone:          
 Component:  Carpet  |     Version:          
Resolution:          |    Keywords:          
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Comment (by eschnett):

 Recomposing (modifying the grid structure) proceeds from coarse to fine
 levels. This has to happen in this order, since newly created regions
 depend on respective coarser grids, and may also depend on boundary data
 or ghost zones on these coarser grids. This means in particular that
 recomposing and calling postregrid has to occur in lock-step. Calling a
 global mode routine before the new grid structure has been set up seems
 thus inconsistent. global-early routines need to be disabled in
 postregrid.

 We can still allow early-meta mode routines early in postregrid, as these
 do not have access to the grid hierarchy.

 global-early loop-local is clearly impossible. Depending on the particular
 action, this either needs to be distributed over local mode routines, or
 needs to be turned into a global-late loop-local routine, and some other
 actions may also need to be deferred.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/971#comment:2>
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