used at nce (up to one unique collective module per collective function).
Matches r15795:15921 of the tmp/bwb-coll-select branch
This commit was SVN r15924.
The following SVN revisions from the original message are invalid or
inconsistent and therefore were not cross-referenced:
r15795
r15921
- adding linear algorithm with synchronization for gather.
This algorithm prevents congestion at root process, but introduces
synchronization (serializes non-root processes, but allows messages
to arrive from two processes at the same time).
It performed better than binomial and linear algorithms for large message,
and intermediate and large communicator sizes.
- Updating MPI_Gather decision function to reflect performance results
from MX. I will perform more measurements though - so this one can
change.
This commit was SVN r15165.
