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P. Widener, K. Ferreira, S. Levy, T. Hoefler:

 Exploring the effect of noise on the performance benefit of nonblocking allreduce

(In Proceedings of the 21st European MPI Users' Group Meeting, presented in Kyoto, Japan, pages 77:77--77:82, ACM, ISBN: 978-1-4503-2875-3, Sep. 2014)
Invited to a journal special issue on top picks from EuroMPI'14.


Relaxed synchronization offers the potential of maintaining application scalability by allowing many processes to make independent progress when some processes suffer delays. Yet, the benefits of this approach in important parallel workloads have not been investigated in detail. In this paper, we use a validated simulation approach to explore the noise mitigation effects of nonblocking allreduce in workloads where allreduce is a major contributor to total execution time. Although a nonblocking allreduce is unlikely to provide significant benefit to applications in the low-OS-noise environments expected in next-generation HPC systems, we show that it can potentially improve application runtime with respect to other noise types.


download article:


  author={P. Widener and K. Ferreira and S. Levy and T. Hoefler},
  title={{Exploring the effect of noise on the performance benefit of nonblocking allreduce}},
  booktitle={Proceedings of the 21st European MPI Users' Group Meeting},
  location={Kyoto, Japan},

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