mirror of git://gcc.gnu.org/git/gcc.git
49 lines
1.4 KiB
Fortran
49 lines
1.4 KiB
Fortran
C******************************************************************************
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C FILE: omp_workshare1.f
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C DESCRIPTION:
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C OpenMP Example - Loop Work-sharing - Fortran Version
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C In this example, the iterations of a loop are scheduled dynamically
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C across the team of threads. A thread will perform CHUNK iterations
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C at a time before being scheduled for the next CHUNK of work.
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C AUTHOR: Blaise Barney 5/99
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C LAST REVISED: 01/09/04
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C******************************************************************************
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PROGRAM WORKSHARE1
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INTEGER NTHREADS, TID, OMP_GET_NUM_THREADS,
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+ OMP_GET_THREAD_NUM, N, CHUNKSIZE, CHUNK, I
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PARAMETER (N=100)
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PARAMETER (CHUNKSIZE=10)
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REAL A(N), B(N), C(N)
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! Some initializations
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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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CHUNK = CHUNKSIZE
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!$OMP PARALLEL SHARED(A,B,C,NTHREADS,CHUNK) PRIVATE(I,TID)
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TID = OMP_GET_THREAD_NUM()
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IF (TID .EQ. 0) THEN
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NTHREADS = OMP_GET_NUM_THREADS()
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PRINT *, 'Number of threads =', NTHREADS
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END IF
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PRINT *, 'Thread',TID,' starting...'
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!$OMP DO SCHEDULE(DYNAMIC,CHUNK)
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DO I = 1, N
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C(I) = A(I) + B(I)
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WRITE(*,100) TID,I,C(I)
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100 FORMAT(' Thread',I2,': C(',I3,')=',F8.2)
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ENDDO
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!$OMP END DO NOWAIT
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PRINT *, 'Thread',TID,' done.'
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!$OMP END PARALLEL
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END
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