Energy efficiency analysis of multi-stream MPEG-4 decoder systems

Sébastien Lafond; Jani Boutellier; Johan Lilius; Olli Silvén

doi:10.1117/12.773616

27 February 2008 Energy efficiency analysis of multi-stream MPEG-4 decoder systems

Sébastien Lafond, Jani Boutellier, Johan Lilius, Olli Silvén

Proceedings Volume 6821, Multimedia on Mobile Devices 2008; 68210G (2008) https://doi.org/10.1117/12.773616
Event: Electronic Imaging, 2008, San Jose, California, United States

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.

Citation Download Citation

Sébastien Lafond, Jani Boutellier, Johan Lilius, and Olli Silvén "Energy efficiency analysis of multi-stream MPEG-4 decoder systems", Proc. SPIE 6821, Multimedia on Mobile Devices 2008, 68210G (27 February 2008); https://doi.org/10.1117/12.773616

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