• OpenLB - Open source lattice Boltzmann code

December 3, 2020 at 11:00 am #5393

jdm

Participant

Dear all,

Thanks Stephan and Adrian for your answer.

– I used the OMP mode, not the Hybrid one, indeed.

– here is my OpenMP environment:

OPENMP DISPLAY ENVIRONMENT BEGIN
  _OPENMP = '201511'
  OMP_DYNAMIC = 'FALSE'
  OMP_NESTED = 'FALSE'
  OMP_NUM_THREADS = '144'
  OMP_SCHEDULE = 'DYNAMIC'
  OMP_PROC_BIND = 'TRUE'
  OMP_PLACES = '{0},{72},{1},{73},{2},{74},{3},{75},{4},{76},{5},{77},{6},{78},{7},{79},{8},{80},{9},{81},{10},{82},{11},{83},{12},{84},{13},{85},{14},{86},{15},{87},{16},{88},{17},{89},{18},{90},{19},{91},{20},{92},{21},{93},{22},{94},{23},{95},{24},{96},{25},{97},{26},{98},{27},{99},{28},{100},{29},{101},{30},{102},{31},{103},{32},{104},{33},{105},{34},{106},{35},{107},{36},{108},{37},{109},{38},{110},{39},{111},{40},{112},{41},{113},{42},{114},{43},{115},{44},{116},{45},{117},{46},{118},{47},{119},{48},{120},{49},{121},{50},{122},{51},{123},{52},{124},{53},{125},{54},{126},{55},{127},{56},{128},{57},{129},{58},{130},{59},{131},{60},{132},{61},{133},{62},{134},{63},{135},{64},{136},{65},{137},{66},{138},{67},{139},{68},{140},{69},{141},{70},{142},{71},{143}'
  OMP_STACKSIZE = '0'
  OMP_WAIT_POLICY = 'PASSIVE'
  OMP_THREAD_LIMIT = '4294967295'
  OMP_MAX_ACTIVE_LEVELS = '2147483647'
  OMP_CANCELLATION = 'FALSE'
  OMP_DEFAULT_DEVICE = '0'
  OMP_MAX_TASK_PRIORITY = '0'
  OMP_DISPLAY_AFFINITY = 'FALSE'
  OMP_AFFINITY_FORMAT = 'level %L thread %i affinity %A'
OPENMP DISPLAY ENVIRONMENT END

– Unfortunately, I can not easily use MPI on my actual simulation so I would like to avoid anything else than OMP.
I also tried OMP on a much more modest computer (6 cores / 6 threads) and noticed only moderate speedup (~1.4, with all cores running at 100%).

Best,
jdm

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