[ET Trac] [Einstein Toolkit] #2118: Neutron star gallery example produces output different from what is shown on website in ET_Tesla

[Einstein Toolkit]

#2118: Neutron star gallery example produces output different from what is shown
on website in ET_Tesla
----------------------+-----------------------------------------------------
  Reporter:  rhaas    |       Owner:                            
      Type:  defect   |      Status:  confirmed                 
  Priority:  blocker  |   Milestone:  ET_2018_02                
 Component:  Other    |     Version:  development version       
Resolution:           |    Keywords:  Gallery GRHydro regression
----------------------+-----------------------------------------------------

Old description:

> The gallery example https://einsteintoolkit.org/gallery/ns/index.html
> produces output significantly different from what is shown in the
> gallery. Namely the maximum density drops to ~88% of the correct value
> compared to only ~97% in the plot in the gallery.
>
> Attached please find stdout, data file and the plot.
>
> ||=Release=||=Date=||=''ρ'',,max,,=||
> || Gallery || 2013-05 ||
> [[Image(https://einsteintoolkit.org/gallery/ns/rho_max.png, 50%)]] ||
> || Gauss|| 2013-05 || [[Image(rho-Gauss.png, 50%)]] ||
> || Sommerville || 2015-11 || [[Image(rho-Sommerville.png, 50%)]] ||
> || PayneGaposhkin || 2016-12 || [[Image(rho-PayneGaposhkin.png, 50%)]] ||
> || master || 2017-02 || [[Image(rho.png, 50%)]] ||

New description:

 The gallery example https://einsteintoolkit.org/gallery/ns/index.html
 produces output significantly different from what is shown in the gallery.
 Namely the maximum density drops to ~88% of the correct value compared to
 only ~97% in the plot in the gallery.

 Attached please find stdout, data file and the plot.

 ||=Release=||=Date=||=''ρ'',,max,,=||
 || Gallery || 2013-05 ||
 [[Image(https://einsteintoolkit.org/gallery/ns/rho_max.png, 50%)]] ||
 || Gauss || 2013-05 || [[Image(rho-Gauss.png, 50%)]] ||
 || HerschelCXX || 2014-11 || [[Image(rho-HerschelCXX.png, 50%)]] ||
 || Herschel || 2014-11 || [[Image(rho-Herschel.png, 50%)]] ||
 || HilbertF90 || 2015-05 || [[Image(rho-HilbertF90.png, 50%)]] ||
 || Hilbert || 2015-05 || [[Image(rho-Hilbert.png, 50%)]] ||
 || Sommerville || 2015-11 || [[Image(rho-Sommerville.png, 50%)]] ||
 || PayneGaposhkin || 2016-12 || [[Image(rho-PayneGaposhkin.png, 50%)]] ||
 || masterF90 || 2017-02 || [[Image(rho-masterF90.png, 50%)]] ||
 || master || 2017-02 || [[Image(rho.png, 50%)]] ||

--

Comment (by rhaas):

 The difference shows up between the Herschel (good) and Hilbert (bad)
 releases:

 || Herschel || 2014-11 || [[Image(rho-Herschel.png, 50%)]] ||
 || Hilbert || 2015-05 || [[Image(rho-Hilbert.png, 50%)]] ||

 which happens to be when the 'default' code in GRHydro switched from F90
 (Herschel) to CXX (Hilbert). However flipping the {{{use_cxx_code}}}
 parameter does not affect the output so that it does not seem to be a
 difference between CXX and F90 code but something else that changed in
 between the releases.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/2118#comment:9>
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