[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                              
Resolution:                         |    Keywords:  McLachlan constraints tests compiler optimization
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Comment (by anonymous):

 Replying to [comment:8 hinder]:
 > Do the Intel constraints look OK if you disable as much optimisation as
 possible?  e.g. -O0, possibly -fp-model source.  Intel 17 seems to be a
 bit dodgy still.  Do you get the same problems with earlier versions of
 Intel?
 >

 With intel 17.0.2 and -O0, the problem is gone (using
 ML_ADMConstraints::ML_Ham / ML_Mom).
 There is however still a small difference to the gcc results, the relative
 difference in H is around 5e-5.
 Also, with intel 17.0.2 and -O3, there is significant difference when
 going from 80 to 40 MPI procs (4 threads each), H differs by around 6%.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1995#comment:12>
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