[petsc-users] On PCFIELDSPLIT and its implementation

[Edoardo alinovi]

Even in the fortran interface?

Il Mer 9 Nov 2022, 13:52 Matthew Knepley <knepley at gmail.com> ha scritto:

> Fields are numbered from 0.
>
>   Thanks,
>
>      Matt
>
> On Wed, Nov 9, 2022 at 2:20 AM Edoardo alinovi <edoardo.alinovi at gmail.com>
> wrote:
>
>> Hello guys,
>>
>> I am getting this error while using fieldsplit:
>>
>> [3]PETSC ERROR: --------------------- Error Message
>> --------------------------------------------------------------
>>
>> *[3]PETSC ERROR: Nonconforming object sizes[3]PETSC ERROR: Local column
>> sizes 6132 do not add up to total number of columns 9200*
>> [3]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting.
>> [3]PETSC ERROR: Petsc Development GIT revision: v3.18.1-191-g32ed6ae2ff2
>>  GIT Date: 2022-11-08 12:22:17 -0500
>> [3]PETSC ERROR: flubio_coupled on a gnu named alienware by edo Wed Nov  9
>> 08:16:29 2022
>> [3]PETSC ERROR: Configure options PETSC_ARCH=gnu FOPTFLAGS=-O3
>> COPTFLAGS=-O3 CXXOPTFLAGS=-O3 -with-debugging=no -download-fblaslapack=1
>> -download-superlu_dist -download-mumps -download-hypre -download-metis
>> -download-parmetis -download-scalapack -download-ml -download-slepc
>> -download-hpddm -download-cmake
>> -with-mpi-dir=/home/edo/software/openmpi-4.1.1/build/
>> [3]PETSC ERROR: #1 MatCreateSubMatrix_MPIBAIJ_Private() at
>> /home/edo/software/petsc/src/mat/impls/baij/mpi/mpibaij.c:1987
>> [3]PETSC ERROR: #2 MatCreateSubMatrix_MPIBAIJ() at
>> /home/edo/software/petsc/src/mat/impls/baij/mpi/mpibaij.c:1911
>> [3]PETSC ERROR: #3 MatCreateSubMatrix() at
>> /home/edo/software/petsc/src/mat/interface/matrix.c:8340
>> [3]PETSC ERROR: #4 PCSetUp_FieldSplit() at
>> /home/edo/software/petsc/src/ksp/pc/impls/fieldsplit/fieldsplit.c:657
>> [3]PETSC ERROR: #5 PCSetUp() at
>> /home/edo/software/petsc/src/ksp/pc/interface/precon.c:994
>> [3]PETSC ERROR: #6 KSPSetUp() at
>> /home/edo/software/petsc/src/ksp/ksp/interface/itfunc.c:406
>> [3]PETSC ERROR: #7 KSPSolve_Private() at
>> /home/edo/software/petsc/src/ksp/ksp/interface/itfunc.c:825
>> [3]PETSC ERROR: #8 KSPSolve() at
>> /home/edo/software/petsc/src/ksp/ksp/interface/itfunc.c:1071
>>
>> Do you have any ideas? Probably something missing in my brief
>> implementation here:
>>
>>
>>
>>
>> *            call PCSetType(mypc, PCFIELDSPLIT, ierr)              call
>> PCFieldSplitSetBlockSize(mypc, 4-bdim, ierr)           *
>>
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>> *            !2D, 3x3 block            if(bdim==1) then
>> ufields(1) = 0                ufields(2) = 1                pfields(1) = 2
>>               call PCFieldSplitSetFields(mypc, "u", 2, ufields, ufields,
>> ierr)                call PCFieldSplitSetFields(mypc, "p", 1, pfields,
>> pfields, ierr)             ! 3D 4x4 block            else
>> ufields(1) = 0                ufields(2) = 1                ufields(3) = 2
>>               pfields(1) = 3                call
>> PCFieldSplitSetFields(mypc, "u", 3, ufields, ufields, ierr)
>> call PCFieldSplitSetFields(mypc, "p", 1, pfields, pfields, ierr)
>> endif                         ! Field split type ADDITIVE, MULTIPLICATIVE
>> (default), SYMMETRIC_MULTIPLICATIVE, SPECIAL, SCHUR            call
>> PCFieldSplitSetType(mypc, PC_COMPOSITE_SCHUR, ierr)*
>>
>> Thanks for the help!
>>
>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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