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Proceedings Paper

CompatPM: enabling energy efficient multimedia workloads for distributed mobile platforms
Author(s): Ripal Nathuji; Keith J. O'Hara; Karsten Schwan; Tucker Balch
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Paper Abstract

The computation and communication abilities of modern platforms are enabling increasingly capable cooperative distributed mobile systems. An example is distributed multimedia processing of sensor data in robots deployed for search and rescue, where a system manager can exploit the application's cooperative nature to optimize the distribution of roles and tasks in order to successfully accomplish the mission. Because of limited battery capacities, a critical task a manager must perform is online energy management. While support for power management has become common for the components that populate mobile platforms, what is lacking is integration and explicit coordination across the different management actions performed in a variety of system layers. This papers develops an integration approach for distributed multimedia applications, where a global manager specifies both a power operating point and a workload for a node to execute. Surprisingly, when jointly considering power and QoS, experimental evaluations show that using a simple deadline-driven approach to assigning frequencies can be non-optimal. These trends are further affected by certain characteristics of underlying power management mechanisms, which in our research, are identified as groupings that classify component power management as "compatible" (VFC) or "incompatible" (VFI) with voltage and frequency scaling. We build on these findings to develop CompatPM, a vertically integrated control strategy for power management in distributed mobile systems. Experimental evaluations of CompatPM indicate average energy improvements of 8% when platform resources are managed jointly rather than independently, demonstrating that previous attempts to maximize battery life by simply minimizing frequency are inappropriate from a platform-level perspective.

Paper Details

Date Published: 29 January 2007
PDF: 8 pages
Proc. SPIE 6504, Multimedia Computing and Networking 2007, 65040I (29 January 2007); doi: 10.1117/12.704761
Show Author Affiliations
Ripal Nathuji, Georgia Institute of Technology (United States)
Keith J. O'Hara, Georgia Institute of Technology (United States)
Karsten Schwan, Georgia Institute of Technology (United States)
Tucker Balch, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6504:
Multimedia Computing and Networking 2007
Roger Zimmermann; Carsten Griwodz, Editor(s)

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