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The matrix was saved as with this code:
CALL PetscViewerBinaryOpen(PETSC_COMM_WORLD, filename, FILE_MODE_WRITE, viewer, ier) CALL PetscViewerPushFormat(viewer, PETSC_VIEWER_DEFAULT, ier) CALL MatView(A, viewer, ier) CALL PetscViewerDestroy(viewer, ier) I will try again to check for file corruption ________________________________________ From: Stefano Zampini <stefano.zamp...@gmail.com> Sent: Thursday, June 6, 2024 3:01 PM To: Klaij, Christiaan Cc: PETSc users list Subject: Re: [petsc-users] matload and petsc4py You don't often get email from stefano.zamp...@gmail.com. Learn why this is important<https://urldefense.us/v3/__https://aka.ms/LearnAboutSenderIdentification__;!!G_uCfscf7eWS!dhd_vSPt_mzy9yVfgQZvw3KcZQwq--Wojmk9JdzuGmnjbC_54Z7IF0WH6qosvtdRyyjv94blDuN1lAlZepr0msg$> On Thu, Jun 6, 2024, 14:53 Klaij, Christiaan <c.kl...@marin.nl<mailto:c.kl...@marin.nl>> wrote: I'm writing a matrix to file from my fortran code (that uses petsc-3. 19. 4) with -mat_view binary. Then, I'm trying to load this mat into python (that uses petsc-3. 21. 0). This works fine using single or multiple procs when the marix ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd I'm writing a matrix to file from my fortran code (that uses petsc-3.19.4) with -mat_view binary. Then, I'm trying to load this mat into python (that uses petsc-3.21.0). This works fine using single or multiple procs when the marix was written using a single proc (attached file a_mat_np_1.dat). However, when the matrix was written using mulitple procs (attached file a_mat_n_2.dat) I get the error below. Is this supposed to work? If so, what I'm I doing wrong? This should work. And your script seems ok too . How did you save the matrix in parallel? I suspect that file is corrupt $ cat test_matrixImport_binary.py import sys import petsc4py from petsc4py import PETSc from mpi4py import MPI # mat files #filename = "./a_mat_np_1.dat" # Works filename = "./a_mat_np_2.dat" # Doesn't work # Initialize PETSc petsc4py.init(sys.argv) # Create a viewer for reading the binary file viewer = PETSc.Viewer().createBinary(filename, mode='r', comm=PETSc.COMM_WORLD) # Create a matrix and load data from the binary file A = PETSc.Mat().create(comm=PETSc.COMM_WORLD) A.load(viewer) $ python test_matrixImport_binary.py Traceback (most recent call last): File "/projects/P35662.700/test_cklaij/test_matrixImport_binary.py", line 18, in <module> A.load(viewer) File "petsc4py/PETSc/Mat.pyx", line 2025, in petsc4py.PETSc.Mat.load petsc4py.PETSc.Error: error code 79 [0] MatLoad() at /home/cklaij/petsc-3.21.0/src/mat/interface/matrix.c:1344 [0] MatLoad_SeqAIJ() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/seq/aij.c:5091 [0] MatLoad_SeqAIJ_Binary() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/seq/aij.c:5142 [0] Unexpected data in file [0] Inconsistent matrix data in file: nonzeros = 460, sum-row-lengths = 761 $ mpirun -n 2 python test_matrixImport_binary.py Traceback (most recent call last): File "/projects/P35662.700/test_cklaij/test_matrixImport_binary.py", line 18, in <module> Traceback (most recent call last): File "/projects/P35662.700/test_cklaij/test_matrixImport_binary.py", line 18, in <module> A.load(viewer) File "petsc4py/PETSc/Mat.pyx", line 2025, in petsc4py.PETSc.Mat.load A.load(viewer) File "petsc4py/PETSc/Mat.pyx", line 2025, in petsc4py.PETSc.Mat.load petsc4py.PETSc.Error: error code 79 [0] MatLoad() at /home/cklaij/petsc-3.21.0/src/mat/interface/matrix.c:1344 [0] MatLoad_MPIAIJ() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/mpi/mpiaij.c:3035 [0] MatLoad_MPIAIJ_Binary() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/mpi/mpiaij.c:3087 [0] Unexpected data in file [0] Inconsistent matrix data in file: nonzeros = 460, sum-row-lengths = 761 petsc4py.PETSc.Error: error code 79 [1] MatLoad() at /home/cklaij/petsc-3.21.0/src/mat/interface/matrix.c:1344 [1] MatLoad_MPIAIJ() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/mpi/mpiaij.c:3035 [1] MatLoad_MPIAIJ_Binary() at /home/cklaij/petsc-3.21.0/src/mat/impls/aij/mpi/mpiaij.c:3087 [1] Unexpected data in file [1] Inconsistent matrix data in file: nonzeros = 460, sum-row-lengths = 761 [cid:ii_18feda229ee74859a161] dr. ir. 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