Basic HTML version of Foils prepared August 29 98

Foil 55 Partitioning, Communication, and Agglomeration (2)

From Designing and Building Parallel Programs 2: openMP Shared Memory Programming Language DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel(Some foils prepared by Kuck & Associates, Inc.)
1 Agglomeration analysis changes a little
  • OpenMP cannot nest control constructs easily
    • Requires intervening parallel section, with OMP_NESTED turned on
  • Major issue on shared memory machines is locality in memory layout
    • Nearest neighbors agglomerated together as blocks
    • Therefore, encourage each processor to keep using the same contiguous section(s) of memory
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