About the Event
In this talk, I present two architecture and circuit co-design techniques for efficient power delivery for multi-core processors.
First, I propose an efficient on-chip voltage regulation technique that exploits (i) core-to-core voltage variations are relatively small for most execution intervals when the voltages/frequencies are optimized to maximize performance under a power constraint and (ii) per-core power-gating devices augmented with small circuits can serve as low-cost voltage regulators (VRs) that can provide high efficiency in situations like (i). The experimental results show that processors using our technique can achieve power efficiency as high as those using per-core on-chip switching VRs at much lower cost.
Second I present a VR optimization technique, which exploits the processor P-state residency of multi-core processors running commercial workloads, to maximize VR power conversion efficiency. The experimental results demonstrate up to 20% efficiency improvement for mobile, desktop, and server processors.
Nam Sung Kim is an Assistant Professor at the University of Wisconsin-Madison. He has been conducting interdisciplinary research that cuts across device, circuit, and architecture for power-efficient computing. His research has been supported by National Science Foundation, Semiconductor Research Corporation, AMD, IBM, Samsung, Microsoft, DARPA, and Korean Ministry of Education, Science, and Technology. Prior to joining the University of Wisconsin-Madison, He was a senior research scientist at Intel from 2004 to 2008, where he conducted research in power-efficient digital circuit and processor architecture. Nam Sung Kim has published nearly 80 refereed articles to highly-selective conferences and journals in the field of digital circuit, processor architecture, and computer-aided design. The top five most frequently cited papers have more than 2000 combined citations to date. He also has served several prominent international conferences as a technical program committee member. Nam Sung Kim has been the recipient of IEEE Design Automation Conference (DAC) Student Design Contest Award in 2001, Intel Fellowship in 2002, and IEEE International Conference on Microarchitecture (MICRO) Best Paper Award in 2003, NSF CAREER Award in 2010, and IBM Faculty Award in 2011 and 2012. His current research interest is designing robust, low-power computing systems in nanoscale technology. He is an IEEE senior member and holds a Ph.D. in Computer Science and Engineering from the University of Michigan-Ann Arbor, and both an M.S. and a B.S. in Electrical Engineering from Korea Advanced Institute of Science and Technology.