SCHEDULE: NOV 12-18, 2011

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A `Cool' Load Balancer for Parallel Applications

SESSION: Power Optimization

EVENT TYPE: Paper

TIME: 2:00PM - 2:30PM

AUTHOR(S):Osman Sarood, Laxmikant Kale

ROOM:TCC 304

ABSTRACT:
Meeting the power requirements of huge exascale machines of the future would become a major challenge. In this paper, we focus on minimizing cooling power and propose a technique that uses a combination of DVFS and temperature aware load balancing to constrain core temperatures as well as save cooling energy. Our scheme is designed specifically to suit tightly coupled parallel applications. The temperature control comes at the cost of increased execution time, which we try to minimize. We experiment with three applications (with different power utilization profiles) running on a 128-core (32-node) cluster with a dedicated air conditioning unit. We calibrate the efficacy of our scheme based on three metrics: ability to control average core temperatures thereby avoiding hot spot occurrence, timing penalty minimization, and cooling energy savings. Our results show cooling energy savings of up to 57% with timing penalties mostly in the 2 to 20% range.

Chair/Author Details:

Osman Sarood - University of Illinois at Urbana-Champaign

Laxmikant Kale - University of Illinois at Urbana-Champaign

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The full paper can be found in the ACM Digital Library