[ET Trac] [Einstein Toolkit] #1795: PITTNullCode results depend on number of processors

[Einstein Toolkit]

#1795: PITTNullCode results depend on number of processors
-----------------------------------+----------------------------------------
 Reporter:  rhaas                  |       Owner:                     
     Type:  defect                 |      Status:  new                
 Priority:  major                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:  PITTNullCode           |  
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 As part of trying to add SphericalHarmonicReconGen to the ET I noticed
 that PITTNullCode produces different results depending on the number of
 cores used. This already happens with the %%regression_test%% test if
 SphericalHarmonicRecon that is already in the ET. The issue is hidden
 right now since the test uses very lose tolerances of
 {{{
 ABSTOL 1.5e-5
 RELTOL 1.5e-4
 }}}

 Changing them to the standard Cactus accuracies and regenerating the tests
 shows that the test that was generated using 2 processors fails when run
 with a single MPI process.

 Test data is in the branch rhaas/procdependency .

 This needs to be fixed or the arrangement must be marked as broken unless
 this is the intended behaviour in which case this needs to be documented
 prominently in the documenation.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1795>
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