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Erschienen in:
2012 | OriginalPaper | Buchkapitel
Leveraging Task-Parallelism in Energy-Efficient ILU Preconditioners
verfasst von : José I. Aliaga, Manuel F. Dolz, Alberto F. Martín, Rafael Mayo, Enrique S. Quintana-Ortí
Erschienen in: ICT as Key Technology against Global Warming
Verlag: Springer Berlin Heidelberg
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We analyze the energy-performance balance of a task-parallel computation of an ILU-based preconditioner for the solution of sparse linear systems on multi-core processors. In particular, we elaborate a theoretical model for the power dissipation, and employ it to explore the effect of the processor power states on the time-power-energy interaction for this calculation. Armed with the insights gained from this study, we then introduce two energy-saving mechanisms which, incorporated into the runtime in charge of the parallel execution of the algorithm, improve energy efficiency by 6.9%, with a negligible impact on performance.