1 / 6

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 ()

chaim-freeman
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related