Section: New Results

High-Performance Intra-node Collective Operations

Participant : Brice Goglin.

• KNem is known to improve the performance of point-to-point intra-node MPI communication significantly [13] .

• We designed an extended RMA interface in KNem that suits the needs of point-to-point, collective and RMA operations.

• We showed that the native use of KNem in MPI collective implementations enabled further optimization by combining the knowledge of collective algorithms with the mastering of KNem region management and copies.

• This work was initiated in the context of our collaboration with the MPICH2 team and is now also pursued within the Open MPI project in collaboration with the University of Tennessee in Knoxville.