sponsored byIEEEACMThe International Conference for High Performance 
Computing, Networking, Storage and Analysis
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SCHEDULE: NOV 16-21, 2014

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Diagnosing Network Bottlenecks: One-sided Message Contention

SESSION: Poster Reception

EVENT TYPE: Posters, Best Poster Finalist

TIME: 5:15PM - 7:00PM

AUTHOR(S):Nathan R. Tallent, Abhinav Vishnu, Hubertus Van Dam, Jeff Daily, Darren J. Kerbyson, Adolfy Hoisie

ROOM:New Orleans Theater Lobby


Two trends suggest network contention for one-sided messages is poised to become a performance problem that concerns application developers: an increased interest in one-sided programming models and a rising ratio of hardware threads to network injection bandwidth. Unfortunately, it is difficult to reason about network contention and one-sided messages because one-sided tasks can either decrease or increase contention. We present effective and portable techniques for diagnosing the causes and severity of one-sided message contention. We characterize contention for an important computational chemistry benchmark on InfiniBand, Cray Aries, and IBM Blue Gene/Q interconnects. We pinpoint the sources of contention, estimate their severity, and show that when message delivery time deviates from an ideal model, there are other messages contending for the same network links. With a small change to the benchmark, we reduce contention up to 50% and improve total runtime as much as 20%.

Chair/Author Details:

Nathan R. Tallent - Pacific Northwest National Laboratory

Abhinav Vishnu - Pacific Northwest National Laboratory

Hubertus Van Dam - Pacific Northwest National Laboratory

Jeff Daily - Pacific Northwest National Laboratory

Darren J. Kerbyson - Pacific Northwest National Laboratory

Adolfy Hoisie - Pacific Northwest National Laboratory

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