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SCHEDULE: NOV 16-21, 2014
When viewing the Technical Program schedule, on the far righthand side is a column labeled "PLANNER." Use this planner to build your own schedule. Once you select an event and want to add it to your personal schedule, just click on the calendar icon of your choice (outlook calendar, ical calendar or google calendar) and that event will be stored there. As you select events in this manner, you will have your own schedule to guide you through the week.
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
ABSTRACT:
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
Click here to download .ics calendar file
