Performance Tradeoffs in Multi-tier Formulation of a Finite Difference Method

  • Authors:
  • Scott B. Baden;Daniel Shalit

  • Affiliations:
  • -;-

  • Venue:
  • ICCS '01 Proceedings of the International Conference on Computational Sciences-Part I
  • Year:
  • 2001

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Abstract

Multi-tier platforms are hierarchically organized multicomputers with multiprocessor nodes. Compared with previous-generation single-tier systems based on uniprocessor nodes, they present a more complex array of performance tradeoffs. We describe performance programming techniques targeted to finite difference methods running on two large scale multi-tier computers manufactured by IBM: NPACI's Blue Horizon and ASCI Blue-Pacific Combined Technology Refresh. Our techniques resulted in performance improvements ranging from 10% to 17% over a traditional single-tier SPMD implementation.