[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):

 We can activate SystemTopology automatically, and/or require it by thorn
 MPI.

 We can correct the affinity settings on Stampede. But what about Blue
 Waters, Comet, Cori, Edison, ...? For each system, and for each
 combination of (number of MPI processes per node, number of OpenMP threads
 per MPI process), we need to check that the run script sets up something
 useful.

 In this case here, we didn't even discuss the number of MPI processes and
 OpenMP threads used, and we didn't check that the new "good" settings do
 something reasonable for other cases.

 There are at least three important cases: one MPI process per node, one
 per socket, and one per core; and if someone experiments with under-
 subscribing a node (because of running out of memory), we don't silently
 want to do the wrong thing. The respective if statements and conditions in
 the run scripts can be hairy.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1850#comment:10>
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