[ET Trac] [Einstein Toolkit] #1752: GRHydro con2prim is not a projection

[Einstein Toolkit]

#1752: GRHydro con2prim is not a projection
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  Reporter:  rhaas                  |       Owner:                     
      Type:  defect                 |      Status:  new                
  Priority:  minor                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  GRHydro            
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Comment (by knarf):

 From a design and programming standpoint I agree. However, did you try
 this? I am sure you are aware: the idea behind using the old solution is
 to not only find the new solution faster since the old values are most
 likely close to the new ones, but I can imagine cases in which starting
 from "some initial value" might actually fail to converge, while it might
 not when using a better initial guess.

 A possible, and already discussed method would be to not overwrite the
 initial guesses. However, for that to work one would need more memory,
 either to copy the old primitive guesses beforehand, or to solve into
 temporary storage before moving that into the primitive storage later. We
 used that to have the code try different con2prim routines without
 destroying the initial guesses some years back.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1752#comment:1>
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