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Publications of SPCL
|T. Hoefler, T. Schneider, A. Lumsdaine:|
|The Impact of Network Noise at Large-Scale Communication Performance|
(. Vol , Nr. , In Proceedings of the 23rd IEEE International Parallel & Distributed Processing Symposium, LSPP'09 Workshop, presented in Rome, Italy, pages , , ISSN: 1530-2075, ISBN: 978-1-4244-3750-4, May 2009)
Invited to a journal special issue on top picks from LSPP'09.
AbstractThe impact of operating system noise on the performance of large-scale applications is a growing concern and ameliorating the effects of OS noise is a subject of active research. A related problem is that of network noise, which arises from shared use of an interconnection network by parallel processes. To characterize the impact of network noise on parallel applications we conducted a series of simulations and experiments using a newly-developed benchmark. Experiments results show a decrease in the communication performance of a parallel reduction operation by a factor of two on 246 nodes. In addition, simulations show that influence of network noise grows with the system size. Although network noise is not as well-studied as OS news, our results clearly show that it is an important factor that must be considered when running large-scale applications.