P03: Early Evaluation of the Cray XT3 Session: Posters: Applications Event Type: Poster Time: 5:00pm - 7:00pm Speaker(s): J. S. Vetter, S. R. Alam, T. H. Dunigan, Jr., M. R. Fahey, P. C. Roth, P. H. Worley, J. S. Vetter Location: 4th Floor South Lobby Abstract: Oak Ridge National Laboratory recently received delivery of a 25 TF Cray XT3. The XT3 is Cray’s third-generation massively parallel processing system. The system builds on a single processor node—the AMD Opteron—and uses a custom chip—called SeaStar—to provide interprocessor communication. In addition, the system uses a lightweight operating system on the compute nodes. This poster describes our initial experiences with the system, including micro-benchmark, kernel, and application benchmark results. In particular, we provide performance results for important Department of Energy applications areas including climate and fusion. Chair/Speaker Details: J. S. Vetter ORNL S. R. Alam ORNL T. H. Dunigan, Jr. ORNL M. R. Fahey ORNL P. C. Roth ORNL P. H. Worley ORNL J. S. Vetter Vetter