Legacy fortran software: applying syntactic metrics to global climate models

• Autores: Méndez, Mariano; Overbey, Jeffrey; Tinetti, Fernando Gustavo
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ciencias Informáticas; Source Code Modernization; HPC; Legacy Systems; Fortran Legacy Systems; Metrics; SOFTWARE ENGINEERING; Software
• Institución: Comisión de Investigaciones Científicas de la Provincia de Buenos Aires

It is di cult to maintain legacy Fortran programs that use outdated programming constructs, especially when this maintenance requires a detailed understanding of the code (e.g., for parallelization).\nInitially, we want to gauge the prevalence of such constructs by applying straightforward syntactic metrics to some well-known global climate models. Detailed information regarding les, subroutines, and loops has been collected from each model by applying a lightweight source code static analysis based on ASTs (Abstract Syntax Tree) for a posterior analysis. Modernizing Fortran Legacy programs is still a challenge. Our objective has been to collect relevant information on these programs to help us approach parallelizing legacy scienti c programs in a shared memory environment (e.g. using multi-core processors). The data we collected indicate that old Fortran features are still being used on these models in these days. Furthermore, we propose some metrics to be used as a guide to determine how many changes a program needs in order to be modernized, optimized, and eventually, parallelized.
Eje: Workshop Ingeniería de software (WIS)