Basic HTML version of Foils prepared August 7 98

Foil 26 Conjugate Gradient: Mapping

From DoD HPF Training -- 5. Parallel Programming in HPF DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 This program looks like a more complicated version of Jacobi iteration to the compiler.
  • Allocate arrays based on DISTRIBUTE
  • Apply owner-computes rule
  • Detect communication from dependence analysis and intrinsics
  • Useful optimizations include aggregating communication, overlapping communication with computation
  • All of this becomes more interesting if the program encapsulates operations in a subroutine
    • The programmer must trade off efficiency for flexibility and maintainability
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