Basic HTML version of Foils prepared 17 Sept 1996

Foil 29 Abstract Processors in HPF

From New CPS615HPF and Fortran90 Discussion Sept 17 96 Basic Simulation Track for Computational Science CPS615 -- Fall Semester 96. by Geoffrey C. Fox, Tom Haupt
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)

© on Tue Oct 7 1997