[ET Trac] [Einstein Toolkit] #1911: Hydro_InitExcision sphere_pugh_ppm test fails

Einstein Toolkit trac-noreply at einsteintoolkit.org
Tue Jun 7 02:46:54 CDT 2016

#1911: Hydro_InitExcision sphere_pugh_ppm test fails
  Reporter:  barry.wardell  |       Owner:                     
      Type:  defect         |      Status:  reopened           
  Priority:  unset          |   Milestone:                     
 Component:  Other          |     Version:  development version
Resolution:                 |    Keywords:                     

Comment (by knarf):

 Non concerning nans: the absolute differences in the velocity here are
 larger than 10e-7. This is usually considered too large for double-
 precision hydro simulations. Only looking at the Cactus-diff-output I
 cannot judge why that is, but I suspect these values are supposed to be
 zero, or close to it, but -ffast-math seems to produce a considerably
 larger error. This is a problem.

 I don't think we are likely to find a workaround for this in time for the
 release (code that works better even with fast math). I would suggest to
 remove --fast-math from the Ubuntu option list for the time being.

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1911#comment:6>
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