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First Experiences Porting a Parallel Application to a Hybrid Supercomputer with OpenMP4.0 Device Constructs

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OpenMP: Heterogenous Execution and Data Movements (IWOMP 2015)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 9342))

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Abstract

In this paper we describe the process of porting the NekBone mini-application to run on a Cray XC30 hybrid supercomputer using OpenMP device constructs, as introduced in version 4.0 of the OpenMP standard and implemented in a pre-release version of the Cray Compilation Environment (CCE) compiler. We document the process of porting and show how the performance evolves during the addition on the 66 constructs needed to accelerate the application. In doing so, we provide a user-centric introduction to the device constructs and an overview of the approach needed to port a parallel application using these. Some contrasts with OpenACC are also drawn to aid those wishing to either implement both programming models or to migrate from one to the other.

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Notes

  1. 1.

    We use the term “accelerator” generically to cover technologies including GPUs (e.g. from Nvidia or AMD) and coprocessors (such as the Intel Xeon Phi “Knights Corner” coprocessor).

References

  1. The Top500 list. http://www.top500.org

  2. The OpenACC standard. http://www.openacc.org

  3. Levesque, J.M., Sankaran, R., Grout, R.: Hybridizing S3D into an exascale application using OpenACC: an approach for moving to multi-petaflops and beyond. In: Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis (SC 2012), Article 15, p. 11. IEEE Computer Society Press, Los Alamitos, CA, USA (2012)

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  4. Fuhrer, O.: Proceedings of CUG2014 (May 2014, Lugano, Switzerland). https://cug.org/proceedings/cug2014_proceedings/includes/files/inv108.pdf

  5. The OpenMP standard. http://www.openmp.org

  6. The Nek5000 project. https://nek5000.mcs.anl.gov/index.php/Main_Page

  7. Markidis, S., Ivanov, I., Akhmetova, D., Laure, E., Gong, J., Schlatter, P., Henningson, D., Fischer, P.: Proceedings of EASC2015 (April 2015, Edinburgh, UK). http://www.easc2015.ed.ac.uk/program-archive/slides/s18Ivanov.pdf

  8. The EPiGRAM project. http://www.epigram-project.eu

  9. The CRESTA project. http://www.cresta-project.eu

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Acknowledgments

This work was supported in part by the European Commission through the EPiGRAM project (grant agreement no. 610598).

Author information

Authors and Affiliations

  1. Cray Exascale Research Initiative Europe, JCMB, King’s Buildings, Edinburgh, EH9 3FD, UK

    Alistair Hart

Authors
  1. Alistair Hart
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Corresponding author

Correspondence to Alistair Hart .

Editor information

Editors and Affiliations

  1. RWTH Aachen University, Aachen, Germany

    Christian Terboven

  2. Lawrence Livermore National Laboratory, Livermore, California, USA

    Bronis R. de Supinski

  3. RWTH Aachen University, Aachen, Germany

    Pablo Reble

  4. University of Houston, Houston, California, USA

    Barbara M. Chapman

  5. RWTH Aachen University, Aachen, Germany

    Matthias S. Müller

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© 2015 Springer International Publishing Switzerland

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Hart, A. (2015). First Experiences Porting a Parallel Application to a Hybrid Supercomputer with OpenMP4.0 Device Constructs. In: Terboven, C., de Supinski, B., Reble, P., Chapman, B., Müller, M. (eds) OpenMP: Heterogenous Execution and Data Movements. IWOMP 2015. Lecture Notes in Computer Science(), vol 9342. Springer, Cham. https://doi.org/10.1007/978-3-319-24595-9_6

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  • DOI: https://doi.org/10.1007/978-3-319-24595-9_6

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-24594-2

  • Online ISBN: 978-3-319-24595-9

  • eBook Packages: Computer ScienceComputer Science (R0)

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