P18: Portable Performance Characterization of the Community Climate System Model (CCSM3) with Tuning and Analysis Utilities (Tau) Session: Posters: Performance Event Type: Poster Time: 5:00pm - 7:00pm Speaker(s): George R Carr Jr, John B Drake, Michael W Ham, Forrest M Hoffman, Sameer Shende, Patrick H Worley Location: 4th Floor South Lobby Abstract: We present our experiences characterizing the performance of the CCSM using the Tau on several HPC systems. CCSM is the primary model for global climate research in the US and is supported on a variety of computer systems. The model development is coordinated by the National Center for Atmospheric Research and the code has demonstrated performance portability across vector and cache based parallel architectures. The application is composed of five executables run in MPMD mode using MPI and may use OpenMP for portions of the processing. Characterizing the performance on a given platform can be very difficult and time consuming. Tau is a collection of tools which support portable HPC application performance characterization on a number of the HPC systems of interest to the CCSM community. Tau is being developed jointly by the University of Oregon, Los Alamos National Laboratory, and Research Centre Julich supporting a growing list of HPC users. Chair/Speaker Details: George R Carr Jr NCAR John B Drake ORNL Michael W Ham ORNL Forrest M Hoffman ORNL Sameer Shende U Oregon Patrick H Worley ORNL