PPT Slide

• Objective
  • Reuse a communication pattern generated in INSPECTOR phase by specifying array access index is unchanged.
  • Original idea from CSCS/Vienna.

• Example

!HPF$ DISTRIBUTE A(BLOCK) ONTO PROC

DO ...

...

!HPF$ UNCHANGED_INDEX (.true.) A

DO I=1,N

... = A(IDX(I))

ENDDO

...

ENDDO

Communication Pattern Reuse

Outer Loop

1st

2nd

3rd

Generate

comm.

Pattern

Indirect Access

• 1997 JAHPF

Reuse

Reuse

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