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Efficient Shared Memory and RDMA based Collectives on Multi-rail QsNetII SMP Clusters
 

Summary: 1
Efficient Shared Memory and RDMA based Collectives on Multi-rail QsNetII
SMP Clusters
Ying Qian Ahmad Afsahi1
Department of Electrical and Computer Engineering
Queen's University, Kingston, ON, Canada K7L 3N6
ying.qian@ece.queensu.ca ahmad.afsahi@queensu.ca
Abstract
Clusters of Symmetric Multiprocessors (SMP) are more commonplace than ever in achieving high-
performance. Scientific applications running on clusters employ collective communications extensively.
Shared memory communication and Remote Direct Memory Access (RDMA) over multi-rail networks are
promising approaches in addressing the increasing demand on intra-node and inter-node
communications, and thereby in boosting the performance of collectives in emerging multi-core SMP
clusters. In this regard, this paper designs and evaluates two classes of collective communication
algorithms directly at the Elan user-level over multi-rail Quadrics QsNetII
with message striping: 1)
RDMA-based traditional multi-port algorithms for gather, all-gather, and all-to-all collectives for
medium to large messages, and 2) RDMA-based and SMP-aware multi-port all-gather algorithms for
small to medium size messages.
The multi-port RDMA-based Direct algorithm for gather and all-to-all collectives gain an

  

Source: Afsahi, Ahmad - Department of Electrical and Computer Engineering, Queen's University (Kingston)

 

Collections: Computer Technologies and Information Sciences