Basic HTML version of Foils prepared August 29 98

Foil 13 How It Is Identified: Message Tags

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 used an integer "tag" (a.k.a. "type" or "id") to match messages when received
  • Most systems allowed wildcard on receive
    • Unsafe due to unexpected message arrival
  • Most could match sender id, some w/ wildcards
    • Wildcards unsafe; strict checks inconvenient
  • All systems let users pick the tags
    • Unsafe for libraries due to interference
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