[ET Trac] [Einstein Toolkit] #1446: use hwloc to choose ideal number of threads

[Einstein Toolkit]

#1446: use hwloc to choose ideal number of threads
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 Reporter:  rhaas        |       Owner:  eschnett           
     Type:  enhancement  |      Status:  new                
 Priority:  minor        |   Milestone:                     
Component:  Carpet       |     Version:  development version
 Keywords:               |  
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 Currently if OMP_NUM_THREADS is not set Cactus ends up using the "default"
 number of threads, which usually is as many as there are cores. This is
 however not always ideal, eg if one uses 2 MPI processes per machine or
 when using SMT or when running on a magny cours CPU which has 1/2 of a FPU
 unit per SMT unit.

 Instead it might be useful to have the driver consult with hwloc to choose
 a more ideal number of threads.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1446>
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