Abstract
If higher performance is required, a parallel application developer might have to extract more parallelism than initially employed in the application. To illustrate this step, this chapter presents a parallel implementation of H.264 decoding on a shared-memory system that scales to a large number of cores. The application implements the dynamic 3D-Wave algorithm, which exploits intra-frame MB-level parallelism as well as inter-frame MB-level parallelism. The 3D-Wave algorithm is based on the observation that inter-frame dependencies have a limited spatial range, i.e., that motion vectors are typically short. Experimental results obtained using a simulator of a many-core architecture containing NXP TriMedia TM3270 embedded processors show that the implementation scales very well, achieving a speedup of more than 50 on a 64-core processor for a 25-frame FHD sequence.
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Juurlink, B., Alvarez-Mesa, M., Chi, C.C., Azevedo, A., Meenderinck, C., Ramirez, A. (2012). Extracting More Parallelism: the 3D-Wave. In: Scalable Parallel Programming Applied to H.264/AVC Decoding. SpringerBriefs in Computer Science. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-2230-3_5
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DOI: https://doi.org/10.1007/978-1-4614-2230-3_5
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