Impact of Power-Management Granularity on The Energy-Quality Trade-off for Soft And Hard Real-Time Applications
Milutinović, Aleksandar and Goossens, Kees and Smit, Gerard J.M. (2008) Impact of Power-Management Granularity on The Energy-Quality Trade-off for Soft And Hard Real-Time Applications. In: International Symposium on System-on-Chip, SoC, 05-06 Nov 2008, Tampere, Finland (pp. pp. 1-4).
|Abstract:||In this paper we introduce the concepts of work of tokens
(e.g. video frames) in an application, and slack arising from variations in work. Slack is used for dynamic voltage and frequency scaling in combination with a conservative power-management policy that never misses deadlines, for hard real-time applications, and with a nonconservative
policy for soft real-time applications. We evaluate both
policies for a number of different granularities (frequency of activation of the power manager) on an MPEG4 application, on energy and quality(deadline misses).
We conclude that for soft real-time applications, there is a clear optimum in the energy, which depends on the work histogram of the application. The conservative policy has no deadline misses, and is only negligibly more expensive in terms of energy than the non-conservative policy. Finally, the granularity of both policies can be very coarse (128 frames) to reduce the power manager activation frequency, which has an insignicant energy cost.
|Item Type:||Conference or Workshop Item|
|Copyright:||© 2008 IEEE|
Electrical Engineering, Mathematics and Computer Science (EEMCS)
|Link to this item:||http://purl.utwente.nl/publications/65264|
|Export this item as:||BibTeX|
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