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

[Einstein Toolkit]

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

 SystemTopology's default behaviour is harmful if you run multiple
 independent simulations on the same node, e.g. if you are using a personal
 workstation. In this case, the two SystemTopology instances don't know
 about each other, and will both choose the same cores, reducing
 performance by 1/2. There is no good way around this -- if a simulation
 doesn't "own" a node, then something else with more knowledge (e.g. the
 kernel) needs to schedule thread/core assignments.

 Otherwise, SystemTopology should always be beneficial, or at least not
 harmful.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1850#comment:20>
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