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Summary: Efficient RDMA-based Multi-port Collectives on Multi-rail QsNetII
Clusters
Ying Qian Ahmad Afsahi
Department of Electrical and Computer Engineering
Queen's University
Kingston, ON, Canada K7L 3N6
qiany@ee.queensu.ca ahmad.afsahi@queensu.ca
Abstract
Many scientific applications use MPI collective
communications intensively. Therefore, efficient and
scalable implementation of collective operations is critical
to the performance of such applications running on
clusters. Quadrics QsNetII
is a high-performance
interconnect for clusters that implements some collectives
at the Elan level. These collectives are directly used by
their corresponding MPI collectives.
Quadrics software supports point-to-point striping
over multi-rail QsNetII
networks. However, multi-rail
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