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International Journal of High Performance Computing Applications
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An Evaluation of the Oak Ridge National Laboratory Cray XT3

Sadaf R. Alam

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Richard F. Barrett

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Mark R. Fahey

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Jeffery A. Kuehn

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

O.E. Bronson Messer

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Richard T. Mills

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Philip C. Roth

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

Jeffrey S. Vetter

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA, VETTER{at}COMPUTER.ORG

Patrick H. Worley

OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE, 37831 USA

In 2005, Oak Ridge National Laboratory (ORNL) received delivery of a 5294 processor Cray XT3. The XT3 is Cray's third-generation massively parallel processing system. The ORNL system uses a single-processor node built around the AMD Opteron and uses a custom chip—called SeaStar—for interprocessor communication. The system uses a lightweight operating system called Catamount on its compute nodes. This paper provides a performance evaluation of the Cray XT3, including measurements for micro-benchmark, kernel, and application benchmarks. In particular, we provide performance results for strategic Department of Energy applications areas including climate, biology, astrophysics, combustion, and fusion. Our results, on up to 4096 processors, demonstrate that the Cray XT3 provides competitive processor performance, high interconnect bandwidth, and high parallel efficiency on a diverse application workload, typical in the DOE Office of Science.

Key Words: Cray XT3 • Catamount lightweight kernel • performance evaluation • benchmarks • applications

International Journal of High Performance Computing Applications, Vol. 22, No. 1, 52-80 (2008)
DOI: 10.1177/1094342007085019
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