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DO J=2,N-1 DO I=2,N-1

DO J=2,N-1 DO I=2,N-1 А( I,J ) = A(I-1,J) + A(I,J-1) + A(I+1,J) + A(I,J+1) / 4 ENDDO ENDDO. Нить 0. Нить 1. Нить N. Нить 0. Нить 1. Нить 2. !$OMP PARALLEL DEFAULT(SHARED) PRIVATE(I,J,IAM,NUMT,ILIMIT) !$ IAM = OMP_GET_THREAD_NUM ()

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DO J=2,N-1 DO I=2,N-1

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  1. DO J=2,N-1 DO I=2,N-1 А(I,J) = A(I-1,J) + A(I,J-1) + A(I+1,J) + A(I,J+1) / 4 ENDDO ENDDO

  2. Нить 0 Нить 1 Нить N

  3. Нить 0 Нить 1 Нить 2

  4. !$OMP PARALLEL DEFAULT(SHARED) PRIVATE(I,J,IAM,NUMT,ILIMIT) !$ IAM = OMP_GET_THREAD_NUM () !$ NUMT = OMP_GET_NUM_THREADS () !$ ISYNC (IAM) = 0 !$ ILIMIT=MIN(NUMT-1, N-1-2) !$OMP BARRIER DO J=2,N-1 !$ IF (IAM .GT. 0 .AND. IAM .LE. ILIMIT) THEN !$ DO WHILE (ISYNC(IAM-1) .EQ. 0) !$OMP FLUSH(ISYNC) !$ ENDDO !$ ISYNC(IAM-1)=0 !$OMP FLUSH(ISYNC) !$ ENDIF !$OMP DO DO I=2,N-1 А(I,J) = (A(I-1,J) + A(I,J-1) + A(I+1,J) + A(I,J+1)) / 4 ENDDO !$OMP ENDDO NOWAIT !$ IF (IAM .LT. ILIMIT) THEN !$ DO WHILE (ISYNC(IAM) .EQ. 1) !$OMP FLUSH(ISYNC) !$ ENDDO !$ ISYNC(IAM)=1 !$OMP FLUSH(ISYNC) !$ ENDIF ENDDO !$OMP END PARALLEL

  5. !$OMP PARALLEL PRIVATE(J,I,IAM,NEWJ) !$ IAM = OMP_GET_THREAD_NUM() DO NEWJ = 2, N-1 + OMP_GET_NUM_THREADS () - 1 J = NEWJ-IAM !$OMP DO SCHEDULE (STATIC) DO I = 2, N-1 !$ IF (J .LT. 2 .OR. J .GT. N-1) THEN !$ CYCLE !$ ENDIF A( I, J ) = (A( I-1, J ) + A( I+1, J ) + A( I, J-1 ) +A( I, J+1 ))/4 ENDDO ENDDO !$OMP END PARALLEL

  6. Материалы по курсу: ftp://ftp.keldysh.ru/K_student/OpenMp

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