Abstract
Oak Ridge National Laboratory (ORNL), Sandia National Laboratories (SNL), and Pittsburgh Supercomputing Center (PSC) are in the midst of a project through which their supercomputers are linked via high speed networks. The overall goal of this project is to solve national security and scientific problems too large to run on any single available machine. This paper describes the infrastructure used in the linked computing environment and discusses issues related to porting and running the Locally Self-consistent Multiple Scattering (LSMS) code in the linked environment. In developing a geographically distributed heterogeneous environment of high performance massively parallel processors (MPP) and porting code to it, a variety of problems were encountered and solved. Comparative performance measurements for the LSMS on a single machine and across linked machines are given along with an interpretation of the results.
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