WHAT: Decrease default value of mpi_add_procs_cutoff from 1024 to 32
WHY: The "partial add procs" behavior is supposed to be a key feature of v2.0.0
WHERE: ompi/mpi/runtime/ompi_mpi_params.c
TIMEOUT: Next Tuesday teleconf (9 Feb 2016)
MORE DETAIL:
The mpi_add_procs_cutoff MCA param controls the crossover to when we start
doing "partial" add_procs() behavior (i.e., don't just pml.add_procs(ALL_PROCS)
during MPI_INIT). Currently, this value defaults to 1024, meaning that we
don't get the "partial add_procs" behavior until you run 1025 processes.
Does anyone have an issue with reducing this value to a lower value? I picked
32 somewhat arbitrarily. See the PR for master:
https://github.com/open-mpi/ompi/pull/1340
--
Jeff Squyres
[email protected]
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