Basic HTML version of Foils prepared August 7 98

Foil 27 Why Use ALIGN?

From DoD HPF Training -- 4. HPF Data Mapping Facilities DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
³Copy² distributions
  • ­ DISTRIBUTE one array as the ³master² for data layout
  • ­ ALIGN other arrays to it
  • ­ Just modify one line to change all the distributions
    • ­ This will be common when porting codes!
Off-by-one problems
  • ­ Sometimes boundaries get in the way of DISTRIBUTE
Differing array sizes
  • ­ Will the compiler handle this better?
    • REAL a(16), b(8)
    • !HPF$ ALIGN b(i) WITH a(2*i)
    • !HPF$ DISTRIBUTE a(BLOCK)
  • ­ Or this?
    • REAL a(16), b(8)
    • !HPF$ DISTRIBUTE a(BLOCK), b(BLOCK)

© Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Sun Aug 9 1998