[ET Trac] [Einstein Toolkit] #1846: Very large grids with bboxset2

[Einstein Toolkit]

#1846: Very large grids with bboxset2
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 Reporter:  hinder  |       Owner:  eschnett           
     Type:  defect  |      Status:  new                
 Priority:  major   |   Milestone:                     
Component:  Carpet  |     Version:  development version
 Keywords:          |  
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 Using the ET_2015_11 release, Carpet incorrectly replaces sets of
 components with their containing bbox, leading to a large increase in the
 number of grid points on the corresponding refinement level.  This reduces
 simulation speed and causes increased memory usage (a lot).  Using the
 same parameter file, this problem is visible with ET_2015_11, but not with
 ET_2014_05.  Setting CARPET_DISABLE_BBOXSET2, or setting
 CarpetRegrid2::min_fraction = 1, both work around the problem.  The
 bboxset2 code was enabled between these two releases, so this points to a
 problem with the code in bboxset2 that is used to determine whether to use
 the containing box or not.   I attach parameter files and grid structure
 visualisations which demonstrate the problem.  The parameters files differ
 only in the use of min_fraction = 1, but the same change is observed if
 you compile with -DCARPET_DISABLE_BBOXSET2 in CPPFLAGS.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1846>
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