[ET Trac] [Einstein Toolkit] #1964: Binary neutron star sample has poor OpenMP parallelization

Einstein Toolkit trac-noreply at einsteintoolkit.org
Mon Oct 3 05:28:27 CDT 2016


#1964: Binary neutron star sample has poor OpenMP parallelization
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  Reporter:  anonymous              |       Owner:                     
      Type:  enhancement            |      Status:  new                
  Priority:  unset                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  NsNs               
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Comment (by anonymous):

 This was run on a single node using

 OMP_NUM_THREADS=16 mpirun -np 2 cactus ns.par

 It seemed that most of the time it was using 200% only.

 Later doing "the same" run again it suddenly did full 1600%, so there
 seems to be no issue.

 It was during the evolution, while the iterations incremented, so that
 suggested that it was that low during the whole iteration, which seemed
 weird.

 I tried it again and it was fine!

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1964#comment:3>
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