Basic HTML version of Foils prepared August 29 98

Foil 8 What Gets Sent: The Buffer

From Designing and Building Parallel Programs 3: MPI Message Passing System DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
1 1st generation message passing systems allowed only a contiguous array of bytes
  • Hid the real data structure from hardware and programmer
    • Might avoid efficient support
  • Required pre-packing dispersed data, e.g.:
    • Rows of a matrix stored columnwise
  • Prevented communications between machines with different data representations
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