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[Cluster] Improve message passing part.

This rewrites in part the message passing part, using in place gather, and collecting, rather than merging, the data of all threads.

neutral with a single thread per rank:
Score of new-2mpi-1t vs old-2mpi-1t: 789 - 787 - 2615  [0.500] 4191
Elo difference: 0.17 +/- 6.44

likely progress with multiple threads per rank:
Score of new-2mpi-36t vs old-2mpi-36t: 76 - 53 - 471  [0.519] 600
Elo difference: 13.32 +/- 12.85
This commit is contained in:
Joost VandeVondele 2018-12-27 15:42:53 +01:00 committed by Stéphane Nicolet
parent 7a32d26d5f
commit ac43bef5c5
4 changed files with 76 additions and 45 deletions