[petsc-users] syntax for routine in PCMGSetResidual

[Timothée Nicolas]

Sorry, here is the full error message

[0]PETSC ERROR: Nonconforming object sizes
[0]PETSC ERROR: Preconditioner number of local rows -1 does not equal
resulting vector number of rows 71808
[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
trouble shooting.
[0]PETSC ERROR: Petsc Release Version 3.6.0, Jun, 09, 2015
[0]PETSC ERROR: ./mips_implicit on a arch-linux2-c-opt named helios90 by
tnicolas Fri Nov 13 10:39:14 2015
[0]PETSC ERROR: Configure options
--prefix=/csc/softs/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real
--with-debugging=0 --with-x=0 --with-cc=mpicc --with-fc=mpif90
--with-cxx=mpicxx --with-fortran --known-mpi-shared-libraries=1
--with-scalar-type=real --with-precision=double --CFLAGS="-g -O3 -mavx
-mkl" --CXXFLAGS="-g -O3 -mavx -mkl" --FFLAGS="-g -O3 -mavx -mkl"
[0]PETSC ERROR: #1 PCApply() line 472 in
/csc/releases/buildlog/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real/petsc-3.6.0/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: #2 KSP_PCApply() line 242 in
/csc/releases/buildlog/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real/petsc-3.6.0/include/petsc/private/kspimpl.h
[0]PETSC ERROR: #3 KSPInitialResidual() line 63 in
/csc/releases/buildlog/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real/petsc-3.6.0/src/ksp/ksp/interface/itres.c
[0]PETSC ERROR: #4 KSPSolve_GMRES() line 235 in
/csc/releases/buildlog/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real/petsc-3.6.0/src/ksp/ksp/impls/gmres/gmres.c
[0]PETSC ERROR: #5 KSPSolve() line 604 in
/csc/releases/buildlog/anl/petsc-3.6.0/intel-15.0.0.090/bullxmpi-1.2.8.2/real/petsc-3.6.0/src/ksp/ksp/interface/itfunc.c

2015-11-13 10:38 GMT+09:00 Matthew Knepley <knepley at gmail.com>:

> On Thu, Nov 12, 2015 at 6:47 PM, Timothée Nicolas <
> timothee.nicolas at gmail.com> wrote:
>
>> Hi all,
>>
>> In the manual and the documentation, the syntax for the routine to be
>> given as argument of PCMGSetResidual:
>>
>> PCMGSetResidual <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/PC/PCMGSetResidual.html#PCMGSetResidual>(PC pc,PetscInt <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Sys/PetscInt.html#PetscInt> l,PetscErrorCode <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Sys/PetscErrorCode.html#PetscErrorCode> (*residual)(Mat <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Mat/Mat.html#Mat>,Vec <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Vec/Vec.html#Vec>,Vec <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Vec/Vec.html#Vec>,Vec <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Vec/Vec.html#Vec>),Mat <http://www.mcs.anl.gov/petsc/petsc-3.6/docs/manualpages/Mat/Mat.html#Mat> mat)
>>
>>
>> is not specified. I mean that the order of the vectors is not specified.
>> I suppose it is something like
>> residual(Mat,b,x,r) with r = b - Mat*x, but it could as well be any
>> combination like residual(Mat,r,x,b). There is no example in the
>> documentation of the usage so I am confused. Does it absolutely need to be
>> set ? I find the manual a bit confusing on this point. Is it only if
>> matrix-free matrices are used ?
>>
>> In the present situation, I use matrix-free operators in a multigrid
>> preconditioner (but the interpolation and restriction are not matrix free)
>> and have not set this residual function yet. I get the following error:
>>
>
> Always always always give the entire error message. We want the stack.
>
> The problem here looks like the preconditioner is reporting -1 rows for
> process 13.
>
>   Matt
>
>
>> [13]PETSC ERROR: Preconditioner number of local rows -1 does not equal
>> resulting vector number of rows 67584
>>
>> Could this be related ? By the way, I don't understand what is meant by
>> the "preconditioner number of local rows". I have separately tested the
>> operators at each level and they are fine.
>>
>> Best
>>
>> Timothee
>>
>
>
>
> --
> 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
>
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