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

Einstein Toolkit trac-noreply at einsteintoolkit.org
Mon Mar 21 13:48:51 CDT 2016

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

Comment (by hinder):

 Replying to [comment:30 dradice@…]:
 > Ian, yes please move the comments on SystemTopology and sorry for
 hijacking your ticket!
 No problem - you were not the first person to raise the issue of
 activating SystemTopology automatically.  I am not a proponent of that
 course of action (it cannot handle the machine-dependent case of socket
 affinity correctly, as this must be done before MPI_Init, and the core
 affinity is balanced automatically by the OS, giving a suboptimal but not
 terrible performance, and it is confusing when more than one simulation
 runs on a node), so if someone thinks it is a good idea, please create a
 ticket and include why you think this should be done.

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1850#comment:32>
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