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By R.J. Allan, M.F. Guest, A.D. Simpson, D.S. Henty, D. Nicole

Over the earlier decade excessive functionality computing has confirmed the power to version and are expecting appropriately quite a lot of actual homes and phenomena. a lot of those have had an immense effect in contributing to wealth construction and bettering the standard of existence during the improvement of recent items and approaches with higher efficacy, potency or lowered damaging unwanted effects, and in contributing to our skill to appreciate and describe the area round us. Following a survey ofthe U.K.'s pressing desire for a supercomputingfacility for aca­ demic examine (see subsequent chapter), a 256-processor T3D approach from Cray study Inc. went into operation on the collage of Edinburgh in the summertime of 1994. The excessive functionality Computing Initiative, HPCI, used to be validated in November 1994 to aid and make sure the effective and powerful exploitation of the T3D (and destiny gen­ erations of HPC platforms) by means of a few consortia operating within the "frontier" components of computational examine. The Cray T3D, now comprising 512 processors and overall of 32 CB reminiscence, represented a really major bring up in computing strength, permitting simulations to maneuver ahead on a bunch offronts. The three-fold goals of the HPCI might be summarised as follows; (1) to hunt and continue a global classification place incomputational scienceand engineering, (2) to help and advertise exploitation of HPC in undefined, trade and company, and (3) to help schooling and coaching in HPC and its application.

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16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. J. Peiro, J. Peraire and K. -F. J. Blake, Partitioning and scheduling algorithms and their implementation in FELISA - an unstructured grid Euler solver, in: Parallel Computational Fluid Dynamics 93: New Trends and Advances, A. Ecer et al. M. Goringe, E. J. J. Bush, Linear-scaling DFT Pseudopotential Calculations on Parallel Computers, Compo Phys. Comms. (1997). M. J. Noble FARM - a flexible asymptotic R-matrix package, Camp.

The 23-node Southampton IBM SP2 system hosts a variety of research by users at the University, with our main EPSRC users being the Complex Fluids consortium We also have a share of the Faculty of Engineering's twelve node SGIICray Origin. We are developing our own commodity based supercomputing platfonn based around an eight node Alpha cluster within the group 3,4. We are collaborating with Daresbirry Laboratory who have a similar Pentium II-based system 5. 37 The recently established Computational Engineering Design Centre under Professor Andy Keane has consolidated research in the Engineering Faculty in modelling of engineering systems.

1998) in press. 41 OPTIMISATION, ALGORITHMS AND SOFTWARE PERFORMANCE OPTIMISATION ON THE CRAY T3E Stephen Booth EPCC The University of Edinburgh Edinburgh EH93JZ INTRODUCTION This paper compares the code optimisation techniques used on the Cray T3D and T3E-900 systems. The Edinburgh Parallel Computing Centre (EPCC) runs a national super-computing service on behalf of the academic and research community in the UK including HPCI consortia.

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