1
1
Mikhail Kurnosov 7bd63e79c8 coll/libnbc: add Rabenseifner's algorithm for MPI_Ireduce
An implementation of R. Rabenseifner's algorithm for MPI_Ireduce.
This algorithm is a combination of a reduce-scatter implemented with recursive vector halving
and recursive distance doubling, followed either by a gather.

Limitations:
-- count >= 2^{\floor{\log_2 p}}
-- commutative operations only
-- intra-communicators only

Signed-off-by: Mikhail Kurnosov <mkurnosov@gmail.com>
2018-10-09 20:27:09 +07:00
..
2018-08-30 10:07:18 +09:00