[ET Trac] [Einstein Toolkit] #1995: McLachlan constraint tests fail

[Einstein Toolkit]

#1995: McLachlan constraint tests fail
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 Reporter:  hinder                                             |       Owner:                     
     Type:  defect                                             |      Status:  new                
 Priority:  major                                              |   Milestone:  ET_2016_11         
Component:  EinsteinToolkit thorn                              |     Version:  development version
 Keywords:  McLachlan constraints tests compiler optimization  |  
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 Several tests fail on several machines, and the cause seems to be the
 constraints calculated by McLachlan.  Peter is looking into this.  We see
 test failures in the thorns Dissipation and RotatingSymmetry90/180.
 Indications are that most failures happen with Intel 15, but some are
 apparently also seen with Intel 16, while others with Intel 16 seem to
 work fine. Optimization -O1 instead of -O2 seems to prevent the problem,
 but is not a viable workaround. A simple 'print' statement in the affected
 (auto-generated) code also makes the problem disappear. Running using one
 MPI process and one openMP thread reproduces the problem. valgrind does
 not find anything obvious pointing to memory mess-up.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1995>
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