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.

Publications of SPCL

D. De Sensi, S. Di Girolamo, T. Hoefler:

 Mitigating Network Noise on Dragonfly Networks through Application-Aware Routing

(In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC19), Nov. 2019, )

Publisher Reference

Abstract

System noise can negatively impact the performance of HPC systems, and interconnection network is one of the main factors contributing to this problem. To mitigate this effect, adaptive routing sends packets on non-minimal paths if they are less congested. However, while this may mitigate interference caused by congestion, it also generates more traffic since packets traverse additional hops, causing in turn congestion on other applications and on the application itself. In this paper, we first describe how to estimate network noise. By following these guidelines, we show how noise can be reduced by using routing algorithms which select minimal paths with a higher probability. We exploit this knowledge to design an algorithm which changes the probability of selecting minimal paths according to the characteristics of the application. We validate our solution on microbenchmarks and applications on two systems relying on a Dragonfly interconnection network, showing a reduction of network noise.

Documents

download article:
access preprint on arxiv:
 

BibTeX

@inproceedings{,
  author={Daniele De Sensi and Salvatore Di Girolamo and Torsten Hoefler},
  title={{Mitigating Network Noise on Dragonfly Networks through Application-Aware Routing}},
  year={2019},
  month={11},
  booktitle={Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC19)},
  note={},
}