[petsc-users] matload and petsc4py

[Klaij, Christiaan]

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?

$ 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



dr. ir. Christiaan Klaij
 | Senior Researcher | Research & Development
T +31 317 49 33 44 |  c.kl...@marin.nl | 
https://urldefense.us/v3/__http://www.marin.nl__;!!G_uCfscf7eWS!YrcVeQ6V8OD3jKxSzzxpyuTgFdncWh4YcL1SgDT8NHqystMpzO1pkd17oNGni-ll5I8qH9_ueOtj3WYWm7XFthU$
 

a_mat_np_1.dat
Description: a_mat_np_1.dat

a_mat_np_1.dat.info
Description: a_mat_np_1.dat.info

a_mat_np_2.dat
Description: a_mat_np_2.dat

a_mat_np_2.dat.info
Description: a_mat_np_2.dat.info