Thanks for your answer, Matt.
The problem is that I am using ML as a preconditioner and it does not
support 64 bit indices (information reported in the PETSc configure
phase).
I am afraid I am stuck with this wrong nonzeros number.
Nicolas
Nicolas TARDIEU
Ing. Chercheur
EDF - R&D Dpt AMA
nicolas.tardieu at edf.fr
T?l. : 01 47 65 39 05
Un geste simple pour l'environnement, n'imprimez ce message que si vous en
avez l'utilit?.
knepley at gmail.com
Envoy? par : petsc-users-bounces at mcs.anl.gov
17/07/2012 16:59
Veuillez r?pondre ?
petsc-users at mcs.anl.gov
A
petsc-users at mcs.anl.gov
cc
Objet
Re: [petsc-users] Number of nonzeros > 2^31-1
On Tue, Jul 17, 2012 at 6:20 AM, Nicolas TARDIEU <nicolas.tardieu at edf.fr>
wrote:
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?
You could configure using --with-64-bit-indices.
Matt
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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