Profiling and scalability of the high resolution NCEP model for weather and climate simulations

Coupled climate modeling has become one of the most challenging fields with the development of multicore architectures and its importance in daily weather and climate predictions. At IITM, `PRITHVI´ cluster (~70TF), NCEP Climate Forecast System (CFS) and its atmospheric component (GFS) have been installed on IBM Power6 architecture. Here, we investigate the scalability of the MPI-OPenMP hybrid models (CFS, GFS) and the limitations of hybrid spectral models when going to high resolutions. Also, this paper looks into the performance and scaling with these two models (CFS, GFS) on the TeraFLOP cluster, varying the threads and describes the preliminary results for the high resolution simulations.