Nagoya University, Japan
Realtime Tracking of Minimum Energy Point in Microprocessors
Scaling the supply voltage (VDD) and threshold voltage (VTH) simultaneously for minimizing the energy consumption of processors dynamically is highly desired for applications such as wireless sensor network and Internet of Things (IoT). In this talk, we refer to a pair of VDD and VTH, which minimizes the energy consumption of the processor under a given performance constraint, as a minimum energy point (MEP in short). Since MEP tracking largely reduces the energy consumption of processors without fundamental degradation of the performance, a lot of effective algorithms for the MEP tracking have been proposed over the past several years. However, to the best of our knowledge, all of the previous algorithms is based on time consuming power measurement to identify the MEP at runtime that prevent us from real-time tracking of the MEP. This talk presents a method for real-time tracking of the MEP based on a pre-characterized MEP-curve of the target processor. The method is validated using a RISC-V processor designed with 55nm DDC process technology.
Tohru Ishihara received his Dr.Eng. degree in computer science from Kyushu University in 2000. For the next three years, he was a Research Associate in the University of Tokyo. From 2003 to 2005, he was with Fujitsu Laboratories of America as a Research Staff of an Advanced CAD Technology Group. From 2005 to 2011, he was with Kyushu University as an Associate Professor. For the next seven years he was with Kyoto University. In October 2018, he joined Nagoya University where he is currently a Professor in the Department of Computing and Software Systems. His research interests include low-power design methodologies and power management techniques for embedded systems. Dr. Ishihara is a member of the IEEE, ACM, IPSJ and IEICE.
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