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2009 18th International Conference on Parallel Architectures and Compilation Techniques (2009)
Raleigh, North Carolina, USA
Sept. 12, 2009 to Sept. 16, 2009
ISSN: 1089-795X
ISBN: 978-0-7695-3771-9
pp: 281-290
Parallel programming is a requirement in the multi-core era. One of the most promising techniques to make parallel programming available for the general users is the use of parallel programming patterns. Functional pipeline parallelism is a pattern that is well suited for many emerging applications, such as streaming and "Recognition, Mining and Synthesis" (RMS) workloads. In this paper we develop an analytical model for pipeline parallelism based on queueing theory. The model is useful to both characterize the performance and efficiency of existing implementations and to guide the design of new pipeline algorithms. We demonstrate the usefulness of the model by characterizing and optimizing two of the PARSEC benchmarks, ferret and dedup. We identified two issues with these codes: load imbalance and I/O bottlenecks. We addressed load imbalance using two techniques: i) parallel pipeline stage collapsing; and ii) dynamic scheduling. We implemented these optimizations using Pthreads and the Threading Building Blocks (TBB) libraries. We compare the performance of different alternatives and we note that the TBB implementation based on work stealing outperforms all other variants.
Parallel pipeline paradigm, load imbalance, work-stealing, analytical model.

R. Asenjo, A. Navarro, S. Tabik and C. Cascaval, "Analytical Modeling of Pipeline Parallelism," 2009 18th International Conference on Parallel Architectures and Compilation Techniques(PACT), Raleigh, North Carolina, USA, 2009, pp. 281-290.
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