[ET Trac] [Einstein Toolkit] #962: parallelize Multipole using OpenMP and MPI

[Einstein Toolkit]

#962: parallelize Multipole using OpenMP and MPI
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  Reporter:  rhaas                  |       Owner:           
      Type:  enhancement            |      Status:  review   
  Priority:  minor                  |   Milestone:           
 Component:  EinsteinToolkit thorn  |     Version:           
Resolution:                         |    Keywords:  Multipole
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Comment (by rhaas):

 I lack data. The single run I just looked at spends about half of ANALYSIS
 (NSNS run, so there are only Hydro_Analysis, Multipole and QLM but not eg
 AHFinderDirect) in Multipole. ANLYSIS was about 10% of the total run time,
 so I doubt Multipole is significant for runs, in particular if
 AEILocalInterp were OpenMP parallelized (which it currently is not). The
 patch *does* make MP much faster in the test case. I had the patches and
 logic lying around from Ylm_Decomp. I am sure I can find some Swedish
 person's law to claim that all part of a code must be parallelized for
 scalability :-)

 Which do you find more objectionable: the while loop to reconstruct el and
 em from lm, or the MPI_Gatherv?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/962#comment:4>
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