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Computer Science and Information Engineering, World Congress on (2009)
Los Angeles, California USA
Mar. 31, 2009 to Apr. 2, 2009
ISBN: 978-0-7695-3507-4
pp: 471-475
Several optimization alternatives are presented for legacy FORTRAN 77 scientific programs, each one with a quantitative characterization in terms of performance gain. Initially, sequential optimization is focused on the analisys of Level 3 BLAS (Basic Linear Algebra Subroutines) utilization, since BLAS have several performance optimized implementations. Also, the Fortran 90/95 array notation is used as a code upgrade from Fortran 77 to Fortran 90/95and, also, to provide the compiler a better source code for performance optimization. Since the shared memory parallel computing model is widely available (multiple cores and/or processors), the analysis of possible parallel processing via OpenMP is presented, along with the performance gain in a specific case. Sequential optimization as well parallelization work is done on a real (production code) program: a weather climate model implemented about two decades ago and used for climate research.
Mónica A. López, Pedro G. Cajaraville, Fernando G. Tinetti, Diego L. Rodrigues, "Fortran Legacy Code Performance Optimization: Sequential and Parallel Processing with OpenMP", Computer Science and Information Engineering, World Congress on, vol. 02, no. , pp. 471-475, 2009, doi:10.1109/CSIE.2009.90
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