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H. Radhakrishnan, D. Rouson, K. Morris, S. Shende, and S. Kassinos, "Test-driven coarray parallelization of a legacy Fortran Application," Proc. SE-HPCCSE 2013: 1st International Workshop on Software Engineering for Performance Computing in Computational Science and Engineering, workshop at SC'13, ACM SIGHPC, pp. 33-40, 2013.

Keywords: performance evaluation, TAU, PRM, Fortran 2008, Co-array Fortran

This paper summarizes a strategy for parallelizing a legacy Fortran 77 program using the object-oriented (OO) and coar- ray features that entered Fortran in the 2003 and 2008 stan- dards, respectively. OO programming (OOP) facilitates the construction of an extensible suite of model-verification and performance tests that drive the development. Coarray par- allel programming facilitates a rapid evolution from a serial application to a parallel application capable of running on multi-core processors and many-core accelerators in shared and distributed memory. We delineate 17 code moderniza- tion steps used to refactor and parallize the program, and study the resulting performance. Our scaling studies show that the bottleneck in the performance was due to the im- plementation of the collective sum procedure. Replacing the sequential procedure with a binary tree procedure improved the scaling performance of the program. This bottleneck will be resolved in the future by new collective procedures in Fortran 2015.

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Created: Mon Dec 3 16:37:16 2001