Basic HTML version of Foils prepared August 29 98

Foil 5 Shared Memory

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.)
Computation(s) using several processors
  • Each processor has some private memory
  • Each processor has access to a memory shared with the other processors
Synchronization
  • Used to protect integrity of parallel program
  • Prevents unsafe memory accesses
  • Fine-grained synchronization (point to point)
  • Barrier: use for global synchronization

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