Basic HTML version of Foils prepared August 7 98

Foil 26 ALIGN and Communication

From DoD HPF Training -- 4. HPF Data Mapping Facilities DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 Communication (data movement) happens when two data items on different processors must be brought together
2 ALIGN relates array elements, ensuring they are mapped together
  • !HPF$ ALIGN a(i) WITH b(i+1)
    • No communication for a(10) = b(11)
    • No information about a(10) = b(10)
3 You can also think of this as modifying DISTRIBUTE
  • Substitute the ALIGN subscripts before doing the communication analysis
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