[ET Trac] [Einstein Toolkit] #1796: Include IllinoisGRMHD into the Toolkit, as an Arrangement

[Einstein Toolkit]

#1796: Include IllinoisGRMHD into the Toolkit, as an Arrangement
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  Reporter:  zachetie@…             |       Owner:  Zachariah Etienne  
      Type:  enhancement            |      Status:  new                
  Priority:  major                  |   Milestone:  ET_2015_11         
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  GRMHD IllinoisGRMHD
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Comment (by Zach Etienne):

 My understanding, based on Ian Hinder's message to the [Users] list
 (Subject: Test case notes), was that tests cannot be long in duration:

 "Tests should run as quickly as possible; ideally in less than one second.
 Longer tests are OK if this is absolutely necessary to test for
 regressions."

 I interpret this to mean that my usual tests for correctness, which might
 require evolutions of order an hour long, running in parallel across
 machines, are disallowed in ET.

 Regardless, I had already added instructions for proper correctness
 testing in the parameter file of my test case:

 In this parameter file, I have added a code comment that outlines the
 basic requirements for agreement. Essentially, if a 15th significant digit
 random perturbation is added to the initial data (via the parameter
 ID_converter_ILGRMHD::random_pert = 1e-15), differences between this
 perturbed run and an unperturbed run after 80 iterations should appear at
 the 12th significant digit. Unfortunately, 80 iterations require several
 minutes.

 Ideally, I'd like to run the test in parallel at higher resolution for at
 least a few hundred iterations (sound-crossing times). In addition, asking
 Carpet to move the grids around would be ideal, a la Eq 85 of
 http://arxiv.org/pdf/1007.2848.pdf. What would be the easiest way to tell
 Carpet to move the grids around according to such a prescription or
 something similar? Another thorn?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1796#comment:14>
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