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Foil 17 Abstract Processors in HPF

From CPS615-Introduction to Virtual Programming Lab -- Problem Architecture Continued and Start of Real HPF Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 26 September 96. by Geoffrey C. Fox *
Secs 174.2
Abstract processors always form a rectilinear grid in 1 or more dimensions
They are abstract coarse grain collections of data-points
  • Remember efficiency says we must "block" communication into large chunks -- processors give us a general target for this
The processor arrangement is defined by the PROCESSORS directive that specifies:
  • name of the processor arrangement
  • the rank (i.e., number of dimensions)
  • the extend in each dimension
Examples:
  • !HPF$ PROCESSORS P(N)
  • *HPF$ PROCESSORS BIZARRO(1972:1997,-20:17)
  • CHPF$ PROCESSORS SCALARPROC (by default sequential)

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