Non quia difficilia sunt non audemus, sed quia non audemus difficilia sunt
Home -> Publications
Home
  Publications
    
all years
    2017
    2016
    2015
    2014
    2013
    2012
    2011
    2010
    2009
    2008
    2007
    2006
    2005
    2004
    theses
    techreports
    presentations
    edited volumes
    conferences
  Awards
  Research
  Teaching
  BLOG
  Miscellaneous
  Full CV [pdf]






  Events








  Past Events





Publications of Torsten Hoefler
Copyright Notice:

The documents distributed by this server have been provided by the contributing authors as a means to ensure timely dissemination of scholarly and technical work on a noncommercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. It is understood that all persons copying this information will adhere to the terms and constraints invoked by each author's copyright. These works may not be reposted without the explicit permission of the copyright holder.

T. Hoefler, T. Schneider and A. Lumsdaine:

 Accurately Measuring Overhead, Communication Time and Progression of Blocking and Nonblocking Collective Operations at Massive Scale

(International Journal of Parallel, Emergent and Distributed Systems. Vol 25, Nr. 4, pages 241-258, Taylor & Francis Group, ISSN: 1744-5779, Jul. 2010)

Abstract

Accurate, reproducible and comparable measurement of the overheads, communication times and progression behavior of blocking and nonblocking collective operations is a complicated task. Although Different measurement schemes for blocking collective operations are implemented in well-known benchmarks, many of these schemes introduce different systematic errors in their measurements. We characterize these errors and select a window-based approach as the most accurate method. However, this approach complicates measurements significantly and introduces clock synchronization as a new source of errors. We analyze approaches to avoid or correct those errors and develop a scalable synchronization scheme to conduct benchmarks on massively parallel systems. Our results are compared to the window-based scheme implemented in the SKaMPI benchmarks and show a reduction of the synchronization overhead by a factor of 16 on 128 processes. We also describe two different measurement schemes for the overhead and asynchronous progress of nonblocking collective communications. An implementation and results of both measurement schemes are presented.

Documents

download article:
 

BibTeX

@article{hoefler-collmea,
  author={T. Hoefler and T. Schneider and A. Lumsdaine},
  title={{Accurately Measuring Overhead, Communication Time and Progression of Blocking and Nonblocking Collective Operations at Massive Scale}},
  journal={International Journal of Parallel, Emergent and Distributed Systems},
  year={2010},
  month={Jul.},
  pages={241-258},
  volume={25},
  number={4},
  publisher={Taylor \& Francis Group},
  issn={1744-5779},
  source={http://www.unixer.de/~htor/publications/},
}

serving: 54.145.71.49:47448© Torsten Hoefler