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1 735 jeremybenn
C******************************************************************************
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C FILE: omp_reduction.f
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C DESCRIPTION:
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C   OpenMP Example - Combined Parallel Loop Reduction - Fortran Version
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C   This example demonstrates a sum reduction within a combined parallel loop
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C   construct.  Notice that default data element scoping is assumed - there
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C   are no clauses specifying shared or private variables.  OpenMP will
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C   automatically make loop index variables private within team threads, and
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C   global variables shared.
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C AUTHOR: Blaise Barney  5/99
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C LAST REVISED:
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C******************************************************************************
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      PROGRAM REDUCTION
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      INTEGER I, N
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      REAL A(100), B(100), SUM
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!     Some initializations
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      N = 100
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      DO I = 1, N
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        A(I) = I *1.0
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        B(I) = A(I)
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      ENDDO
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      SUM = 0.0
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!$OMP PARALLEL DO REDUCTION(+:SUM)
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      DO I = 1, N
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        SUM = SUM + (A(I) * B(I))
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      ENDDO
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      PRINT *, '   Sum = ', SUM
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      END

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