[ET Trac] [Einstein Toolkit] #1850: Severe performance problem on Stampede

Einstein Toolkit trac-noreply at einsteintoolkit.org
Sat Mar 19 04:58:20 CDT 2016

#1850: Severe performance problem on Stampede
  Reporter:  hinder      |       Owner:                     
      Type:  defect      |      Status:  confirmed          
  Priority:  major       |   Milestone:                     
 Component:  SimFactory  |     Version:  development version
Resolution:              |    Keywords:                     

Comment (by dradice@…):

 I recently stumbled upon this issue while running on Stampede with
 ET_2015_11. I do not use simfactory, I am not setting the KMP_AFFINITY
 environment variable, and I am using OpenMPI instead of mvapich.

 I should also mention that I do not see this problem with ET_2014_11, even
 when using the same optionlist, thornlist, and runscripts. I tried running
 both with and without the "tacc_affinity" wrapper that TACC recommends to
 use for hybrid OpenMP/MPI jobs and I see no difference. The only solution
 is to activate the "SystemTopology" thorn.

 I do not think that this issue should be really considered as a simfactory
 bug. The issue is clearly somewhere else. Would it make sense to have
 SystemTopology always active? Is there a reason why I would want to run
 without it?

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1850#comment:19>
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