Porting and Performance of the Community Climate System Model (CCSM3) on the Cray X1

The Community Climate System Model (CCSM3) is the primary model for global climate research in the United States and is supported on a variety of computer systems. We present some of our porting experiences and describe the current performance of the CCSM3 on the Cray X1. We include the status of work in progress on other systems in the Cray product line.