DISTRIBUTE Directive

Distribute objects ONTO processor grids:

       REAL, DIMENSION(50)    :: A
       REAL, DIMENSION(10,10) :: B, C, D
 !HPF$ DISTRIBUTE (BLOCK) ONTO P1         :: A   !1-D
 !HPF$ DISTRIBUTE (CYCLIC,CYCLIC) ONTO P2 :: B,C !2-D
 !HPF$ DISTRIBUTE D(BLOCK,*) ONTO P1    ! alt. syntax

There must be the same number of non-* distributed dimensions as the rank of the grid.

• BLOCK means give a continuous and, as far as possible, equal sized block of elements to each processor,
• CYCLIC means deal the elements out one at a time in a round-robin fashion,
• * means `give this whole dimension to the processor'.

If an object is distributed then it is said to be mapped (or have a mapping).

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