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GASNet-EX: A High-Performance, Portable Communication Library for Exascale

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Languages and Compilers for Parallel Computing (LCPC 2018)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 11882))

Abstract

Partitioned Global Address Space (PGAS) models, typified by languages such as Unified Parallel C (UPC) and Co-Array Fortran, expose one-sided communication as a key building block for High Performance Computing (HPC) applications. Architectural trends in supercomputing make such programming models increasingly attractive, and newer, more sophisticated models such as UPC++, Legion and Chapel that rely upon similar communication paradigms are gaining popularity. GASNet-EX is a portable, open-source, high-performance communication library designed to efficiently support the networking requirements of PGAS runtime systems and other alternative models in future exascale machines. The library is an evolution of the popular GASNet communication system, building upon over 15 years of lessons learned. We describe and evaluate several features and enhancements that have been introduced to address the needs of modern client systems. Microbenchmark results demonstrate the RMA performance of GASNet-EX is competitive with several MPI-3 implementations on current HPC systems.

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Notes

  1. 1.

    On Summitdev we set one environment variable to restrict the MPI implementation to a single rail of the dual-rail network, to provide a meaningful comparison to GASNet-EX. We recommend this configuration because use of a single rail per process can yield significant latency improvements.

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Acknowledgments

This research was funded in part by the Exascale Computing Project (17-SC-20-SC), a collaborative effort of the U.S. Department of Energy Office of Science and the National Nuclear Security Administration.

This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

This research used resources of the Argonne Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract DE-AC02-06CH11357.

This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.

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  1. Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    Dan Bonachea & Paul H. Hargrove

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  1. Dan Bonachea
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    Mary Hall

  2. University of Utah, Salt Lake City, UT, USA

    Hari Sundar

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Bonachea, D., Hargrove, P.H. (2019). GASNet-EX: A High-Performance, Portable Communication Library for Exascale. In: Hall, M., Sundar, H. (eds) Languages and Compilers for Parallel Computing. LCPC 2018. Lecture Notes in Computer Science(), vol 11882. Springer, Cham. https://doi.org/10.1007/978-3-030-34627-0_11

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