Scaling communication intensive applications in BlueGene/P using one-sided communication and overlap

TitleScaling communication intensive applications in BlueGene/P using one-sided communication and overlap
Publication TypeConference Paper
Year of Publication2009
AuthorsNishtala, R., Hargrove P., Bonachea D., & Yelick K.
Conference NameInternational Parallel and Distributed Processing Symposium
Date Published05/2009
Conference LocationRome, Italy
Abstract

In earlier work, we showed that the one-sided communication model found in PGAS languages (such as UPC) offers significant advantages in communication efficiency by decoupling data transfer from processor synchronization.
We explore the use of the PGAS model on IBM Blue-Gene/P, an architecture that combines low-power, quad-core processors with extreme scalability. We demonstrate that the PGAS model, using a new port of the Berkeley UPC compiler and GASNet one-sided communication layer, outperforms two-sided (MPI) communication in both microbenchmarks and a case study of the communication-limited benchmark, NAS FT. We scale the benchmark up to 16,384 cores of
the BlueGene/P and demonstrate that UPC consistently outperforms MPI by as much as 66% for some processor configurations and an average of 32%. In addition, the results demonstrate the scalability of the PGAS model and the Berkeley implementation of UPC, the viability of using it on machines with multicore nodes, and the effectiveness of the BG/P communication layer for supporting one-sided communication and PGAS languages.

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Intensive Applications - IPDPS '09352.49 KB