NDLI: High Performance MPI Datatype Support with User-Mode Memory Registration: Challenges, Designs, and Benefits

Content Provider	IEEE Xplore Digital Library
Author	Mingzhe Li Subramoni, H. Hamidouche, K. Xiaoyi Lu Panda, D.K.
Copyright Year	2015
Description	Author affiliation: Dept. of Comput. Sci. & Eng., Ohio State Univ., Columbus, OH, USA (Mingzhe Li; Subramoni, H.; Hamidouche, K.; Xiaoyi Lu; Panda, D.K.)
Abstract	Noncontiguous data communication has been heavily adopted in scientific applications, especially for those written with MPI. Common strategies to handle noncontiguous data, like packing/unpacking, incur significant performance overhead during communication, which could become as a barrier of using MPI derived datatypes. Recently, a novel feature of Mellanox InfiniBand, called User-mode Memory Registration (UMR), has been introduced for noncontiguous data communication. UMR has the potential to support MPI derived datatype communication efficiently without the overhead of packing/unpacking. In this paper, we analyze the UMR feature and study its basic performance with InfiniBand verbs-level micro-benchmarks. With this knowledge, we propose UMR-based schemes to support zero-copy datatype communication at MPI level. We show that a naive integration of UMR with an MPI stack could not bring performance benefits over existing schemes. Thus we propose two schemes -- UMR Pool and UMR Cache -- to enable high performance MPI datatype communication with UMR. To the best of our knowledge, this is the first paper to study, analyze, and design MPI noncontiguous data communication using the UMR feature. We propose and implement UMR-based designs on top of MVAPICH2 library. The experimental results at the microbenchmark level show that the proposed UMR-based design is able to deliver 4X performance improvement in latency for large message vector benchmarks over the packing/unpacking scheme. At the application level, for a 3D stencil communication kernel with MPI derived datatype on 512 processes, the optimized UMR-based design outperforms the packing/unpacking scheme by 27% in execution time.
Starting Page	226
Ending Page	235
File Size	286212
Page Count	10
File Format	PDF
ISBN	9781467365987
DOI	10.1109/CLUSTER.2015.41
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Data communication Receivers Benchmark testing Bandwidth Protocols Buffer storage Libraries
Content Type	Text
Resource Type	Article

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