[petsc-users] MatPrealloctor

[Barry Smith]

  I'm hoping that it is as simple as that you did not set the block size of your newly created matrix to 3?



> On Jul 29, 2022, at 4:04 PM, Randall Mackie <rlmackie862 at gmail.com> wrote:
> 
> Hi Barry,
> 
> It seems like this should be trivial to get working but so far I’ve been unsuccessful.
> Most likely I’m doing something wrong but I have no idea what that is.
> 
> I’ve attached a little test program that fails with the errors:
> 
> [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> [0]PETSC ERROR: Petsc has generated inconsistent data
> [0]PETSC ERROR: Blocksize of layout 1 must match that of mapping 3 (or the latter must be 1)
> [0]PETSC ERROR: See https://petsc.org/release/faq/ <https://petsc.org/release/faq/> for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.17.3, Jun 29, 2022
> [0]PETSC ERROR: ./test on a linux-gfortran-complex-debug named rmackie-VirtualBox by rmackie Fri Jul 29 12:16:13 2022
> [0]PETSC ERROR: Configure options --with-clean=1 --with-scalar-type=complex --with-debugging=1 --with-fortran=1 --download-mpich=../external/mpich-4.0.1.tar.gz
> [0]PETSC ERROR: #1 PetscLayoutSetISLocalToGlobalMapping() at /home/rmackie/PETSc/petsc-3.17.3/src/vec/is/utils/pmap.c:363
> [0]PETSC ERROR: #2 MatSetLocalToGlobalMapping() at /home/rmackie/PETSc/petsc-3.17.3/src/mat/interface/matrix.c:2012
> 
> 
> Any help to point me in the right direction is appreciated.
> 
> Randy M.
> 
> <files.zip>
> 
>> On Jul 28, 2022, at 2:49 PM, Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
>> 
>> 
>>   I am not sure what you are asking exactly but I think so, so long have you have called MatSetLocalToGlobalMapping() and the "stencil" idea makes sense for your discretization.
>> 
>>  Barry
>> 
>> 
>>> On Jul 28, 2022, at 5:41 PM, Randall Mackie <rlmackie862 at gmail.com <mailto:rlmackie862 at gmail.com>> wrote:
>>> 
>>> Dear PETSc users:
>>> 
>>> Can one use a MatPreallocator and then call MatPreAlloctorPreallocate if using MatStencil routines (which seem to call MatSetValuesLocal).
>>> 
>>> 
>>> Thanks, Randy
>> 
> 

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