[ET Trac] [Einstein Toolkit] #774: hack to unfix OpenMP threads from cores on Cray machines

[Einstein Toolkit]

#774: hack to unfix OpenMP threads from cores on Cray machines
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  Reporter:  rhaas     |       Owner:  eschnett
      Type:  task      |      Status:  closed  
  Priority:  optional  |   Milestone:          
 Component:  Carpet    |     Version:          
Resolution:  fixed     |    Keywords:  hack    
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Comment (by rhaas):

 This patch detects faulty assignments when not using -cc numa_node for 2,3
 and 12 threads on kraken and does not misdetect 12,6,3,2 threads when
 using -c numa_node (in the later case the affinity is '''always''' to
 either cores 0-5 or 6-11).

 It way to make it fail would be:

 thread 0: affine to core 0,1,2,3,4,5
 thread 1: affine to core 0
 thread 2: affine to core 0

 ie. only thread 0 has its affinity properly set. Kraken does not seem to
 produce this assignment though (its assignments without -cc numa_node are
 unusual other, it does spread threads around a bit but seems to always
 avoid core 1 unless one uses numa_node).

 Please apply.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/774#comment:8>
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