Energy Efficient Computing

Speaker Prof. Tajana Simunic Rosing,
Department of CSE,
UC San Diego
CECS Host Professor Daniel Gajski
Location Engineering Hall (EH) 2430
Date & Time November 16 , 2009
Refreshments at 1:30 pm, Lecture begins at 2:00 pm
Abstract In this talk, we will present the algorithms we have developed at UCSD for lowering the energy consumption in computing systems. We derived optimal power management strategies for stationary workloads that have been implemented both in HW and SW. Run-time adaptation can be done via an online learning algorithm that selects among a set of policies. We generalized the algorithm to include thermal management since we found that minimizing the power consumption does not necessarily reduce the overall energy costs. To reduce the performance costs typically associated with state of the art thermal management techniques, we also developed a new set of proactive management policies. The experimental results using real datacenter workloads on an actual multicore system show that our proactive technique is able to dramatically reduce the adverse effects of temperature by over 60%. Most recently we have shown that symbiotic scheduling of workloads in virtualized environments can lead to average 15% energy savings with 20% performance benefit in high utilization scenarios.We will also present some of the recent work that address the energy savings in battery powered systems, as demonstrated in a new kind of “citizen infrastructure”, an end-to-end health and environmental information system with near real-time data streams and feedback loops from the system to the sensing, processing, and actuation infrastructure. We have developed adaptive algorithms to tradeoff accuracy of computation versus the available energy for such systems, while taking into account the energy harvesting capabilities.

Tajana Simunic Rosing is currently an Assistant Professor in Computer Science Department at UCSD, a director of System Energy Efficiency Lab at UCSD and a head of the Energy efficient datacenter thrust as a part of the MuSyC center. Her research interests are energy efficient computing, embedded and wireless systems. She finished her PhD at Stanford University. Prior to pursuing the PhD, she worked as a Senior Design Engineer at Altera Corporation. She has served at a number of Technical Paper Committees, and is currently an Associate Editor of IEEE Transactions on Mobile Computing.