Ooce Note Series on Global Modeling and Data Assimilation Benchmark and Unit Test Results of the Message-passing Geos General Circulation Model Goddard Space Flight C E N Ter

This document contains the benchmarking and unit test results for the message passing God dard Earth Observing System General Circulation Model MP GEOS GCM The MP GEOS GCM is an atmospheric model which operates on uniform and stretched latitude longitude grids and is closely related to the shared memory parallel GEOS GCM which is currently in production at the Data Assimilation O ce The unit tests give an indication that individual components on the MP GEOS GCM are performing as expected and that the results for a given processor con guration are reproducible The benchmarks re ect the overall performance of the MP GEOS GCM and give an idea of how the application might perform in a production setting This document also serves as a wrap up of the parallelization of the GCM for the High Performance Computing and Communication HPCC initiative