NDLI: Benefits of Cross Memory Attach for MPI libraries on HPC Clusters

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Benefits of Cross Memory Attach for MPI libraries on HPC Clusters

Content Provider	ACM Digital Library
Author	Vienne, Jerome
Abstract	With the number of cores per node increasing in modern clusters, an efficient implementation of intra-node communications is critical for application performance. MPI libraries generally use shared memory mechanisms for communication inside the node, unfortunately this approach has some limitations for large messages. The release of Linux kernel 3.2 introduced Cross Memory Attach (CMA) which is a mechanism to improve the communication between MPI processes inside the same node. But, as this feature is not enabled by default inside MPI libraries supporting it, it could be left disabled by HPC administrators which leads to a loss of performance benefits to users. In this paper, we explain how to use CMA and present an evaluation of CMA using micro-benchmarks and NAS parallel benchmarks (NPB) which are a set of applications commonly used to evaluate parallel systems. Our performance evaluation reveals that CMA outperforms shared memory performance for large messages. Micro-benchmark level evaluations show that CMA can enhance the performance by as much as a factor of four. With NPB, we see up to 24.75% improvement in total execution time for FT and up to 24.08% for IS.
Starting Page	1
Ending Page	6
Page Count	6
File Format	PDF
ISBN	9781450328937
DOI	10.1145/2616498.2616532
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-07-13
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Multicore processing Parallel programming Mpi Performance analysis
Content Type	Text
Resource Type	Article

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