Partial differential equations are used to describe physical phenomena in many science and engineering fields. Finite differencing methods map these continuous equations into discrete space so that they may be solved on computers. Co-Array Fortran provides the means for implementing such solution methods in parallel processing computing environments. In this report we describe our experiences w...

Last year, Oak Ridge National Laboratory received delivery of a 5,294 processor Cray XT3. The XT3 is Cray’s third-generation massively parallel processing system. The system uses a single-processor node built around the AMD Opteron and uses a custom chip—called SeaStar—to provide interprocessor communication. In addition, the system uses a lightweight operating system on its compute nodes. This...

Neutron scattering has been a very powerful probe in the research to the lattice and magnetic structures of various kinds of materials now. In this paper, I will first give a brief introduction of the history of neutron scattering. Then, in the second part, I will talk about the properties of neutron scattering, present its basic mechanism and unique properties. After that, I will give some exa...

Oak Ridge National Laboratory recently received delivery of a 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 paper describes our initi...