[ET Trac] [Einstein Toolkit] #765: NaNChecker should not reduce in local mode

[Einstein Toolkit]

#765: NaNChecker should not reduce in local mode
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  Reporter:  eschnett               |       Owner:     
      Type:  defect                 |      Status:  new
  Priority:  major                  |   Milestone:     
 Component:  EinsteinToolkit thorn  |     Version:     
Resolution:                         |    Keywords:     
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Comment (by rhaas):

 The attached patch splits NaNCheckers operation into a local search
 routine followed by a per-level reduction. It does not use
 ENTER_LEVEL_MODE to not rely on Carpet's code (ie. to compile without
 Carpet present). Note that NaNChecker does not trigger the warning in
 CarpetReduce since it uses reducelocalscalar so does not reduce a grid
 function (it seems to end up in ReduceArrays inside of CarpetReduce). I
 attach a test for NaNChecker (using PUGH, which is likely fragily since it
 relies on IEEE floating point math to create NaNs on the grid).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/765#comment:5>
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