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Parallel and Distributed Processing Symposium, International (2008)
Miami, FL, USA
Apr. 14, 2008 to Apr. 18, 2008
ISBN: 978-1-4244-1693-6
pp: 1-8
Wael R. Elwasif , Oak Ridge National Laboratory, PO Box 2008, TN 37831 USA
David E. Bernholdt , Oak Ridge National Laboratory, PO Box 2008, TN 37831 USA
Aniruddha G. Shet , Oak Ridge National Laboratory, PO Box 2008, TN 37831 USA
Robert J. Harrison , Oak Ridge National Laboratory, PO Box 2008, TN 37831 USA
ABSTRACT
As high-end computer systems present users with rapidly increasing numbers of processors, possibly also incorporating attached co-processors, programmers are increasingly challenged to express the necessary levels of concurrency with the dominant parallel programming model, Fortran+MPI+OpenMP (or minor variations). In this paper, we examine the languages developed under the DARPA High-Productivity Computing Systems (HPCS) program (Chapel, Fortress, and X10) as representatives of a different parallel programming model which might be more effective on emerging high-performance systems. The application used in this study is the Hartree-Fock method from quantum chemistry, which combines access to distributed data with a task-parallel algorithm and is characterized by significant irregularity in the computational tasks. We present several different implementation strategies for load balancing of the task-parallel computation, as well as distributed array operations, in each of the three languages. We conclude that the HPCS languages provide a wide variety of mechanisms for expressing parallelism, which can be combined at multiple levels, making them quite expressive for this problem.
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CITATION
Wael R. Elwasif, David E. Bernholdt, Aniruddha G. Shet, Robert J. Harrison, "Programmability of the HPCS Languages: A case study with a quantum chemistry kernel", Parallel and Distributed Processing Symposium, International, vol. 00, no. , pp. 1-8, 2008, doi:10.1109/IPDPS.2008.4536191
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