Skip to Main content Skip to Navigation
Conference papers

MPI Overlap: Benchmark and Analysis

Abstract : In HPC applications, one of the major overhead compared to sequentiel code, is communication cost. Application programmers often amortize this cost by overlapping communications with computation. To do so, they post a non-blocking MPI request, perform computation, and wait for communication completion, assuming MPI communication will progress in background. In this paper, we propose to measure what really happens when trying to overlap non-blocking point-to-point communications with computation. We explain how background progression works, we describe relevant test cases, we identify challenges for a benchmark, then we propose a benchmark suite to measure how much overlap happen in various cases. We exhibit overlap benchmark results on a wide panel of MPI libraries and hardware platforms. Finally, we classify, analyze, and explain the results using low-level traces to reveal the internal behavior of the MPI library.
Document type :
Conference papers
Complete list of metadata

Cited literature [19 references]  Display  Hide  Download
Contributor : Alexandre Denis Connect in order to contact the contributor
Submitted on : Tuesday, May 31, 2016 - 4:51:46 PM
Last modification on : Monday, December 20, 2021 - 4:50:15 PM
Long-term archiving on: : Thursday, September 1, 2016 - 11:38:27 AM


Files produced by the author(s)


  • HAL Id : hal-01324179, version 1


Alexandre Denis, François Trahay. MPI Overlap: Benchmark and Analysis. International Conference on Parallel Processing, Aug 2016, Philadelphia, United States. ⟨hal-01324179⟩



Les métriques sont temporairement indisponibles