JTpack90: A Parallel, Object-Based, Fortran 90 Linear Algebra Package

We have developed an object-based linear algebra package, currently with emphasis on sparse Krylov methods, driven primarily by needs of the Los Alamos National Laboratory parallel unstructured-mesh casting simulation tool Telluride. Support for a number of sparse storage formats, methods, and preconditioners have been implemented, driven primarily by application needs. We describe our object-based Fortran 90 approach, which enhances maintainability, performance, and extensibility, our parallelization approach using a new portable gather/scatter library (PGSLib), current capabilities and future plans, and present preliminary performance results on a variety of platforms.