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Design and Implementation of an Extended Collectives Library for Unified Parallel C

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Abstract

Unified Parallel C (UPC) is a parallel extension of ANSI C based on the Partitioned Global Address Space (PGAS) programming model, which provides a shared memory view that simplifies code development while it can take advantage of the scalability of distributed memory architectures. Therefore, UPC allows programmers to write parallel applications on hybrid shared/distributed memory architectures, such as multi-core clusters, in a more productive way, accessing remote memory by means of different high-level language constructs, such as assignments to shared variables or collective primitives. However, the standard UPC collectives library includes a reduced set of eight basic primitives with quite limited functionality. This work presents the design and implementation of extended UPC collective functions that overcome the limitations of the standard collectives library, allowing, for example, the use of a specific source and destination thread or defining the amount of data transferred by each particular thread. This library fulfills the demands made by the UPC developers community and implements portable algorithms, independent of the specific UPC compiler/runtime being used. The use of a representative set of these extended collectives has been evaluated using two applications and four kernels as case studies. The results obtained confirm the suitability of the new library to provide easier programming without trading off performance, thus achieving high productivity in parallel programming to harness the performance of hybrid shared/distributed memory architectures in high performance computing.

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Authors and Affiliations

  1. Computer Architecture Group, University of A Coruña, A Coruña, 15071, Spain

    Carlos Teijeiro (Student Member), Guillermo L. Taboada, Juan Touriño (Senior Member, IEEE, Member, ACM) & Ramón Doallo (Member, IEEE)

  2. Galicia Supercomputing Center, Santiago de Compostela, 15705, Spain

    José C. Mouriño

  3. Jülich Supercomputing Centre, Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, D-52425, Germany

    Damián A. Mallón

  4. Industry Standard Servers Group, Hewlett-Packard Company, Montgomery, Alabama, 36117, U.S.A.

    Brian Wibecan

Authors
  1. Carlos Teijeiro
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  2. Guillermo L. Taboada
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  3. Juan Touriño
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  4. Ramón Doallo
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  5. José C. Mouriño
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  6. Damián A. Mallón
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  7. Brian Wibecan
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Corresponding author

Correspondence to Carlos Teijeiro.

Additional information

This work was funded by Hewlett-Packard (Project \Improving UPC Usability and Performance in Constellation Systems: Implementation/Extensions of UPC Libraries"), and partially supported by the Ministry of Science and Innovation of Spain under Project No. TIN2010-16735 and the Galician Government (Consolidation of Competitive Research Groups, Xunta de Galicia ref. 2010/6).

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Teijeiro, C., Taboada, G.L., Touriño, J. et al. Design and Implementation of an Extended Collectives Library for Unified Parallel C. J. Comput. Sci. Technol. 28, 72–89 (2013). https://doi.org/10.1007/s11390-013-1313-9

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  • DOI: https://doi.org/10.1007/s11390-013-1313-9

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