Computer Engineering Seminar

Adaptive voltage overscaling: trading off quality for energy

Professor Ilia Polian

University of Passau
Friday, July 02, 2010
12:00pm - 1:30pm
3725 Beyster Bldg.

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About the Event

We present an energy-reduction strategy for applications which are resilient, i. e. can tolerate occasional errors, based on an adaptive voltage control. The voltage is lowered, possibly beyond the safe-operation region, as long as no errors are observed, and raised again when the severity of the detected errors exceeds a threshold. Due to the resilient nature of the applications, lightweight error detection logic is sufficient for operation, and no expensive error recovery circuitry is required. On a hardware block implementing texture decompression, we observe 25% to 30% energy reduction at negligible quality loss (compared to the error introduced by the lossy compression algorithm). We also investigate the strategy's performance under temperature and process variations as well as different numbers of intermediate voltages used. The strategy automatically chooses the lowest appropriate voltage, and thus the largest energy reduction, for each individual manufactured instance of the circuit.


Ilia Polian received his PhD degree from the University of Freiburg, Germany, in 2003. He is currently Professor of Computer Engineering at the University of Passau. He is an IEEE Senior member, the TTTC Student Activities Chair, and served as the Finance Chair of the IEEE European Test Symposium 2007 in Freiburg, the Vice-Program Chair of the IEEE RASDAT workshop 2010 in Bangalore, as well as on several Program Committees. His research interests are test methods, dependability and security for nanoelectronic circuit and systems.

Additional Information

Contact: Lauri Johnson

Phone: 734-763-4921

Email: lkjohns@eecs.umich.edu

Sponsor(s): Professor John Hayes

Open to: Public