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Proceedings Paper

Energy efficiency analysis of multi-stream MPEG-4 decoder systems
Author(s): Sébastien Lafond; Jani Boutellier; Johan Lilius; Olli Silvén
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Paper Abstract

This paper presents a comparison of two systems that can simultaneously decode multiple videos on a simple CPU and dedicated function-level hardware accelerators. The first system is implemented in a traditional way, such that the decoder instances access the accelerators concurrently without external coordination. The second system implementation coordinates the tasks' accelerator accesses by scheduling. The solutions are compared by execution cycles, energy consumption and cache hit ratios. In the traditional solution each decoder task continuously requests access to the needed hardware accelerators. However, since the other tasks are competing on the same resources, the tasks must often yield and wait for their turn, which reduces the energy-effciency. The scheduling-based approach assumes that the accelerator latencies are deterministic and assigns time slots for accelerator accesses required by each task. The accelerator access schedule is re-designed for each macroblock at run-time, thus avoiding the over-allocation of resources and improving energy-effciency. Deterministic accelerator latencies ensue that the CPU is not interrupted when an accelerator finishes. The contribution of this study is the comparison of the accelerator timing solution against the traditional approach.

Paper Details

Date Published: 27 February 2008
PDF: 10 pages
Proc. SPIE 6821, Multimedia on Mobile Devices 2008, 68210G (27 February 2008); doi: 10.1117/12.773616
Show Author Affiliations
Sébastien Lafond, Åbo Akademi Univ. (Finland)
Jani Boutellier, Univ. of Oulu (Finland)
Johan Lilius, Åbo Akademi Univ. (Finland)
Olli Silvén, Univ. of Oulu (Finland)


Published in SPIE Proceedings Vol. 6821:
Multimedia on Mobile Devices 2008
Reiner Creutzburg; Jarmo H. Takala, Editor(s)

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