[ET Trac] [Einstein Toolkit] #771: Carpet chooses non-ideal domain decompositions

[Einstein Toolkit]

#771: Carpet chooses non-ideal domain decompositions
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 Reporter:  eschnett  |       Owner:  eschnett
     Type:  defect    |      Status:  new     
 Priority:  major     |   Milestone:          
Component:  Carpet    |     Version:          
 Keywords:            |  
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 For a simple 100x100x1 domain, Carpet chooses the following decomposition:

   [0][0][0][0]   exterior: proc 0   [0,0,0] : [24,49,3]   ([25,50,4]) 5000
   [0][0][0][1]   exterior: proc 1   [0,50,0] : [24,99,3]   ([25,50,4])
 5000
   [0][0][0][2]   exterior: proc 2   [25,0,0] : [49,49,3]   ([25,50,4])
 5000
   [0][0][0][3]   exterior: proc 3   [25,50,0] : [49,99,3]   ([25,50,4])
 5000
   [0][0][0][4]   exterior: proc 4   [50,0,0] : [62,99,3]   ([13,100,4])
 5200
   [0][0][0][5]   exterior: proc 5   [63,0,0] : [74,99,3]   ([12,100,4])
 4800
   [0][0][0][6]   exterior: proc 6   [75,0,0] : [87,99,3]   ([13,100,4])
 5200
   [0][0][0][7]   exterior: proc 7   [88,0,0] : [99,99,3]   ([12,100,4])
 4800

 (a) Why are there elongated boxes? The grid should all have the same shape
 (50x25).
 (b) Why are there 25x50 grids? They should have a 50x25 shape.

 If this happens in 3D, performance will suffer.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/771>
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