Dear PETSc users,
I am solving an unstructured finite element-based problem with 500
millions unkwowns with PETSc.
The number of nonzeros is greater than 2^31-1.
Here is the KSPView I get :
----------------------------------------------------------------------------------------------------------------
Matrix Object: 700 MPI processes
type: mpiaij
rows=499125000, cols=499125000
total: nonzeros=-2147483648, allocated nonzeros=-2147483648
total number of mallocs used during MatSetValues calls =0
using I-node (on process 0) routines: found 242923 nodes, limit used
is 5
----------------------------------------------------------------------------------------------------------------
As you can see, The number of nonzeros is <0.
I would like to check that this is due to the number of nonzeros being
greater than 2^31-1.
Here is a short description of the size of differents types :
----------------------------------------------------------------------------------------------------------------
Compiled with full precision matrices (default)
sizeof(short) 2 sizeof(int) 4 sizeof(long) 8 sizeof(void*) 8
sizeof(PetscScalar) 8
----------------------------------------------------------------------------------------------------------------
Is there a workaround? Should I worry about the result of my simulation?
Thanks in advance,
Nicolas
Nicolas TARDIEU
Ing. Chercheur
EDF - R&D Dpt AMA
nicolas.tardieu at edf.fr
T?l. : 01 47 65 39 05
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