Basic HTML version of Foils prepared August 7 98

Foil 8 Why Use DISTRIBUTE?

From DoD HPF Training -- 4. HPF Data Mapping Facilities DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 Compilation is based on the data distribution
  • Computations will execute in parallel if
    • They are conceptually parallel (e.g. array operations)
    • The data is partitioned (e.g. by DISTRIBUTE)
2 Communication and synchronization are based on the data distribution
  • BLOCK reduces surface-to-volume ratio
  • CYCLIC (and CYCLIC(K)) improves load balance
  • * keeps things on one processor
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