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Efficient shared memory and RDMA based collectives on multi-rail QsNetII SMP clusters

机译:多轨QsNetII SMP群集上的高效共享内存和基于RDMA的集合

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摘要

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.
机译:对称多处理器(SMP)集群在实现高性能方面比以往任何时候都更为普遍。在集群上运行的科学应用程序广泛使用集体通信。多轨网络上的共享内存通信和远程直接内存访问(RDMA)是解决节点间和节点间通信不断增长的需求,从而提高新兴多核SMP群集中集合的性能的有前途的方法。因此,本文在具有消息条带化的多轨Quadrics QsNetII 上,直接在Elan用户级别设计和评估了两类集体通信算法:1)基于RDMA的传统多端口算法,用于收集所有信息-收集,以及中到大型消息的所有集合,以及2)基于RDMA和SMP感知的多端口全聚集算法,用于中小型消息。

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