[ET Trac] [Einstein Toolkit] #2023: CarpetInterp hangs with openmpi

Einstein Toolkit trac-noreply at einsteintoolkit.org
Fri Mar 17 10:51:40 CDT 2017

#2023: CarpetInterp hangs with openmpi
  Reporter:  anonymous  |       Owner:                     
      Type:  defect     |      Status:  new                
  Priority:  unset      |   Milestone:                     
 Component:  Other      |     Version:  development version
Resolution:             |    Keywords:  OpenMPI, Carpet    

Comment (by hinder):

 Unfortunately we were unsuccessful in reproducing it in a small test case;
 it was a full SpEC run.  There was no hyperthreading or OpenMP.  In the
 runs where it was not reproducible, are the numerical results identical in
 each different copy of the run, or does the code make different decisions
 based, e.g. on timing, in each case?  SpEC has several places where it
 chooses the best algorithm based on runtime performance, and this meant
 that the code paths were different.  That is why it didn't affect all the
 runs.  Only when we disabled all these options did we manage to get
 something to fail reliably.

Ticket URL: <https://trac.einsteintoolkit.org/ticket/2023#comment:3>
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