Basic HTML version of Foils prepared August 29 98

Foil 42 Jacobi Iteration: MPI Program Design

From Designing and Building Parallel Programs 3: MPI Message Passing System DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
1 Partitioning is simple
  • Every point is a micro-task
2 Communication is simple
  • 4 nearest neighbors in Cartesian mesh
  • Reduction for convergence test
3 Agglomeration works along dimensions
  • 1-D packing for high-latency machines
  • 2-D packing for others (most general)
  • One process per processor practically required
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