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Publications of SPCL

T. Schneider, R. Gerstenberger, T. Hoefler:

 Micro-Applications for Communication Data Access Patterns and MPI Datatypes

(Vol 7490, Nr. , In Recent Advances in the Message Passing Interface - 19th European MPI Users' Group Meeting, EuroMPI 2012, Vienna, Austria, September 23-26, 2012. Proceedings, presented in Vienna, Austria, pages 121-131, Springer, ISSN: , ISBN: 978-3-642-33517-4, Sep. 2012)
Invited to a journal special issue on top picks from EuroMPI'12.

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Abstract

Data is often communicated from different locations in application memory and is commonly serialized (copied) to send buffers or from receive buffers. MPI datatypes are a way to avoid such intermediate copies and optimize communications, however, it is often unclear which implementation and optimization choices are most useful in practice. We extracted the send/recv-buffer access pattern of a representative set of scientific applications into micro-applications that isolate their data access patterns. We also observed that the buffer-access patterns in applications can be categorized into three different groups. Our micro-applications show that up to 90\% of the total communication time can be spent with local serialization and we found significant performance discrepancies between state-of-the-art MPI implementations. Our micro-applications aim to provide a standard benchmark for MPI datatype implementations to guide optimizations similarly to SPEC CPU and the Livermore loops do for compiler optimizations.

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BibTeX

@inproceedings{mpi-ddt-benchmark,
  author={T. Schneider and R. Gerstenberger and T. Hoefler},
  title={{Micro-Applications for Communication Data Access Patterns and MPI Datatypes}},
  year={2012},
  month={09},
  pages={121-131},
  volume={7490},
  number={},
  booktitle={Recent Advances in the Message Passing Interface - 19th European MPI Users' Group Meeting, EuroMPI 2012, Vienna, Austria, September 23-26, 2012. Proceedings},
  location={Vienna, Austria},
  publisher={Springer},
  issn={},
  isbn={978-3-642-33517-4},
}