Quantifying differences between openMP and MPI using a large-scale application suite

Brian Armstrong, Seon Wook Kim, Rudolf Eigenmann

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


In this paper we provide quantitative information about the performance differences between the OpenMP and the MPI version of a large-scale application benchmark suite, SPECseis. We have gathered extensive performance data using hardware counters on a 4-processor Sun Enterprise system. For the presentation of this information we use a Speedup Component Model, which is able to precisely show the impact of various overheads on the program speedup. We have found that overall, the performance figures of both program versions match closely. However, our analysis also shows interesting differences in individual program phases and in overhead categories incurred. Our work gives initial answers to a largely unanswered research question: what are the sources of inefficiencies of OpenMP programs relative to other programming paradigms on large, realistic applications. Our results indicate that the OpenMP and MPI models are basically performance-equivalent on shared-memory architectures. However, we also found interesting differences in behavioral details, such as the number of instructions executed, and the incurred memory latencies and processor stalls.

Original languageEnglish
Title of host publicationHigh Performance Computing - 3rd International Symposium, ISHPC 2000, Proceedings
EditorsMateo Valero, Kazuki Joe, Masaru Kitsuregawa, Hidehiko Tanaka
PublisherSpringer Verlag
Number of pages12
ISBN (Print)9783540411284
Publication statusPublished - 2000
Externally publishedYes
Event3rd International Symposium on High Performance Computing, ISHPC 2000 - Tokyo, Japan
Duration: 2000 Oct 162000 Oct 18

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Other3rd International Symposium on High Performance Computing, ISHPC 2000

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)


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