Performance evaluation of macroblock-level parallelization of H.264 decoding on a cc-NUMA multiprocessor architecture
Document typeConference report
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This paper presents a study of the performance scalability of a macroblock-level parallelization of the H.264 decoder for High De nition (HD) applications on a multiprocessor architecture. We have implemented this parallelization on a cache coherent Non-uniform Memory Access (cc-NUMA) shared memory multiprocessor (SMP) and compared the results with the theoretical expectations. Three di erent scheduling techniques were analyzed: static, dynamic and dynamic with tail-submit. A dynamic scheduling approach with a tail-submit optimization presents the best performance obtaining a maximum speed-up of 9.5 using 24 processors. A detailed pro ling analysis showed that thread synchronization is one of the limiting factors for achieving a better parallel scalability. The paper includes an evaluation of the impact of using blocking synchronization APIs like POSIX threads and POSIX real-time extensions. Results showed that macroblock-level parallelism as a very negrain form of Thread-Level Parallelism (TLP) is highly affected by the thread synchronization overhead generated by these APIs. Other synchronization methods, possibly with hardware support, are required in order to make MB-level parallelization more scalable.
CitationÁlvarez, M. [et al.]. Performance evaluation of macroblock-level parallelization of H.264 decoding on a cc-NUMA multiprocessor architecture. A: 2009 Colombian Computing Conference. "Cuarto Congreso Colombiano de Computación, 4CCC: abril 23-25, 2009, Bucaramanga, Colombia". Bucaramanga: 2009, p. 108-117.
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