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

Einstein Toolkit trac-noreply at einsteintoolkit.org
Wed Oct 7 07:58:27 CDT 2015

#1796: Include IllinoisGRMHD into the Toolkit, as an Arrangement
  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

Comment (by Zach Etienne):

 A test case will be added as required, despite the fact that time
 limitations mean it will be mostly useless to me (see below; I'd love to
 be proven wrong). I figure that at least the users might benefit from an
 example par file.

 After any update to IllinoisGRMHD that might conceivably introduce beyond-
 roundoff-level differences (due to a bug), I manually perform full
 *correctness* testing on a physically-motivated scenario prior to pushing
 my changes. This involves a careful analysis of the growth of roundoff
 error versus a trusted version. I also compare the trusted version with
 itself, but with a 15th significant digit initial perturbation. If the
 growth in roundoff in the new version of IllinoisGRMHD does not match the
 growth in roundoff in the trusted version, it is concluded that
 IllinoisGRMHD has a bug.

 As you might imagine, this testing requires many-timestep runs with AMR
 grid movement, and I don't care if the test takes a couple hours; my
 science requires that the tool be reliable and consistent with trusted
 versions beyond a doubt. Perhaps we should have a longer discussion about
 the possibility of including more robust correctness testing in ET.

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1796#comment:11>
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