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C
C This file is part of MUMPS 5.8.2, released
C on Mon Jan 12 15:17:08 UTC 2026
C
PROGRAM MUMPS_TEST_SAVE_RESTORE
IMPLICIT NONE
INCLUDE 'mpif.h'
INCLUDE 'zmumps_struc.h'
TYPE (ZMUMPS_STRUC) mumps_par_save, mumps_par_restore
INTEGER IERR, I
CALL MPI_INIT(IERR)
C Define a communicator for the package.
mumps_par_save%COMM = MPI_COMM_WORLD
C Initialize an instance of the package
C for L U factorization (sym = 0, with working host)
mumps_par_save%JOB = -1
mumps_par_save%SYM = 0
mumps_par_save%PAR = 1
CALL ZMUMPS(mumps_par_save)
IF (mumps_par_save%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_save%INFOG(1)= ", mumps_par_save%INFOG(1),
& " mumps_par_save%INFOG(2)= ", mumps_par_save%INFOG(2)
GOTO 500
END IF
C Define problem on the host (processor 0)
IF ( mumps_par_save%MYID .eq. 0 ) THEN
READ(5,*) mumps_par_save%N
READ(5,*) mumps_par_save%NZ
ALLOCATE( mumps_par_save%IRN ( mumps_par_save%NZ ) )
ALLOCATE( mumps_par_save%JCN ( mumps_par_save%NZ ) )
ALLOCATE( mumps_par_save%A( mumps_par_save%NZ ) )
DO I = 1, mumps_par_save%NZ
READ(5,*) mumps_par_save%IRN(I),mumps_par_save%JCN(I)
& ,mumps_par_save%A(I)
END DO
END IF
C Activate OOC
mumps_par_save%ICNTL(22)=1
C Call package for factorization
mumps_par_save%JOB = 4
CALL ZMUMPS(mumps_par_save)
IF (mumps_par_save%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_save%INFOG(1)= ", mumps_par_save%INFOG(1),
& " mumps_par_save%INFOG(2)= ", mumps_par_save%INFOG(2)
GOTO 500
END IF
C Call package for save
mumps_par_save%JOB = 7
mumps_par_save%SAVE_DIR="/tmp"
mumps_par_save%SAVE_PREFIX="mumps_simpletest_save"
CALL ZMUMPS(mumps_par_save)
IF (mumps_par_save%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_save%INFOG(1)= ", mumps_par_save%INFOG(1),
& " mumps_par_save%INFOG(2)= ", mumps_par_save%INFOG(2)
GOTO 500
END IF
C Deallocate user data
IF ( mumps_par_save%MYID .eq. 0 )THEN
DEALLOCATE( mumps_par_save%IRN )
DEALLOCATE( mumps_par_save%JCN )
DEALLOCATE( mumps_par_save%A )
END IF
C Destroy the instance (deallocate internal data structures)
mumps_par_save%JOB = -2
CALL ZMUMPS(mumps_par_save)
C Now mumps_par_save has be destroyed
C We use a new instance mumps_par_restore to finish the computation
C Define a communicator for the package on the new instance.
mumps_par_restore%COMM = MPI_COMM_WORLD
C Initialize a new instance of the package
C for L U factorization (sym = 0, with working host)
mumps_par_restore%JOB = -1
mumps_par_restore%SYM = 0
mumps_par_restore%PAR = 1
CALL ZMUMPS(mumps_par_restore)
IF (mumps_par_restore%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_restore%INFOG(1)= ",
& mumps_par_restore%INFOG(1),
& " mumps_par_restore%INFOG(2)= ",
& mumps_par_restore%INFOG(2)
GOTO 500
END IF
C Call package for restore with OOC feature
mumps_par_restore%JOB = 8
mumps_par_restore%SAVE_DIR="/tmp"
mumps_par_restore%SAVE_PREFIX="mumps_simpletest_save"
CALL ZMUMPS(mumps_par_restore)
IF (mumps_par_restore%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_restore%INFOG(1)= ",
& mumps_par_restore%INFOG(1),
& " mumps_par_restore%INFOG(2)= ",
& mumps_par_restore%INFOG(2)
GOTO 500
END IF
C Define rhs on the host (processor 0)
IF ( mumps_par_restore%MYID .eq. 0 ) THEN
ALLOCATE( mumps_par_restore%RHS ( mumps_par_restore%N ) )
DO I = 1, mumps_par_restore%N
READ(5,*) mumps_par_restore%RHS(I)
END DO
END IF
C Call package for solution
mumps_par_restore%JOB = 3
CALL ZMUMPS(mumps_par_restore)
IF (mumps_par_restore%INFOG(1).LT.0) THEN
WRITE(6,'(A,A,I6,A,I9)') " ERROR RETURN: ",
& " mumps_par_restore%INFOG(1)= ",
& mumps_par_restore%INFOG(1),
& " mumps_par_restore%INFOG(2)= ",
& mumps_par_restore%INFOG(2)
GOTO 500
END IF
C Solution has been assembled on the host
IF ( mumps_par_restore%MYID .eq. 0 ) THEN
WRITE( 6, * ) ' Solution is ',
& (mumps_par_restore%RHS(I),I=1,mumps_par_restore%N)
END IF
C Deallocate user data
IF ( mumps_par_restore%MYID .eq. 0 )THEN
DEALLOCATE( mumps_par_restore%RHS )
END IF
C Delete the saved files
C Note mumps_par_restore%ICNTL(34) is kept to default (0) to suppress
C also the OOC files.
mumps_par_restore%JOB = -3
CALL ZMUMPS(mumps_par_restore)
C Destroy the instance (deallocate internal data structures)
mumps_par_restore%JOB = -2
CALL ZMUMPS(mumps_par_restore)
500 CALL MPI_FINALIZE(IERR)
STOP
END
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