Volume 15 Number 2	March 1999

Scientific Simulations Gas Phase Nucleation Multi-Component/ Multi-Phase Materials Estimating Hospital Quality Future Symposium Colloquium Series Special Seminars Visitors Supercomputing '98 Research Reports Two computational scientists from Silicon Graphics Inc., (SGI) came to the Institute to present seminars on topics related to the Origin 2000 supercomputer. Ilene Carpenter, Environmental Applications Analyst from SGI, provided University researchers with practical information for porting codes from the Cray T3E and Cray parallel vector processing systems to the Origin platform. The seminar described software and hardware differences that applications analysts need to be aware of as they migrate codes. Issues discussed included data sizes, compiler and linker options, I/O libraries, parallel performance, binary data conversion, and Message Passing Interface data type conversion. Charles Grassl, Senior Programmer Analyst from SGI, presented University researchers with a tutorial covering programming and optimization for an SGI Origin 2000 computer system. The Origin programming environment was compared and contrasted with that of Cray vector and parallel systems. The tutorial included an overview of the Origin 2000 system’s macro architecture and the architecture of the MIPS R10000 microprocessor used for the processing elements. Specific optimization for single processing units were covered. Parallel programming with respect to both shared memory (directive based) and distributed memory (message passing) was also discussed. space Ilene Carpenter, Environmental Applications Analyst from Silicon Graphics, Inc., prepares for her seminar.   Charles Grassl, Senior Programmer Analyst from Silicon Graphics, Inc., speaks on the SGI Origin 2000 computer system.

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