[ET Trac] [Einstein Toolkit] #1628: Enable padding by default

[Einstein Toolkit]

#1628: Enable padding by default
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  Reporter:  eschnett               |       Owner:                     
      Type:  enhancement            |      Status:  confirmed          
  Priority:  major                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:                     
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Comment (by eschnett):

 It seems that padding is currently broken, in the sense that simulation
 results differ. To make this happen, someone needs to build with padding
 enabled, and then track down where the differences come from.

 Aligning the first non-ghost point is straightforward.

 Unaligned memory access is fast on Intel system, but it requires
 additional instructions. Since McLachlan is limited by instruction cache
 size, ensuring aligned access may have a larger benefit than one would
 otherwise expect. Also, with AVX instructions, unaligned access has become
 more expensive.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1628#comment:2>
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