Adventures in Vectorizing the Community Land Model
Forrest M. Hoffman · 2004
Described here are the extensive efforts of the authors to modify the Community Land Model for vectorization on the Earth Simulator in Japan and the Cray X1 at Oak Ridge National Laboratory. This paper follows experimental results presented at the Cray Users Group (CUG) Meeting in 2003 (White, 2003). Presented here are the technical details of the old and new internal data structures, the required code reorganization, and the resulting performance improvements. Additionally, performance and scaling of the final Community Land Model Version 3 (CLM3) on the IBM Power4, the Earth Simulator, and the Cray X1 are compared. 1