Benchmark and Unit Test Results of the Message-Passing GEOS General Circulation Model

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 OOce. 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 connguration are reproducible. The benchmarks reeect 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. iii Contents Abstract iii List of Figures v 1 Introduction 1 2 Unit Tests and Component Benchmarks 2