A direct out-of-core solver for CGWAVE on the Cray XI

CGWAVE is a general-purpose, state-of-the-art wave-prediction model. It is applicable to the estimation of wave fields in harbors, open coastal regions, coastal inlets, around islands, and around fixed or floating structures. CGWAVE generates a system of simultaneous linear complex equations that are difficult to solve. Some iterative solvers do not converge at all, while others struggle to converge. A direct, banded, out-of-core solver that utilized reordering of the nodes to reduce the size of the bandwidth was written. The solver was then optimized for the US Army Engineer Research and Development Center Major Shared Resource Center (ERDC MSRC) Cray XI. This paper describe the details of how this work was performed and give performance results on the ERDC MSRC Cray XI.