[petsc-users] syntax for routine in PCMGSetResidual

Thu Nov 12 19:56:48 CST 2015

Mmmh, that's strange because I define my matrices with the command

call
MatCreateShell(PETSC_COMM_WORLD,lctx(level)%localsize,lctx(level)%localsize,
&
     &              lctx(level)%ngpdof,lctx(level)%ngpdof,lctx(level),
     &              lctx(level)%Mmat,ierr)

and at each level I checked that the sizes "localsize" and "ngpdof" are
well set.

Timothee

2015-11-13 10:53 GMT+09:00 Matthew Knepley <knepley at gmail.com>:

> On Thu, Nov 12, 2015 at 7:39 PM, Timothée Nicolas <
> timothee.nicolas at gmail.com> wrote:
>
>> 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
>>
>
> The PC uses the matrix it gets to determine sizes, and compare to the
> input vectors it gets for PCApply(). The
> preconditioner matrix is not setup or is not reporting sizes, for example
> if its a MATSHELL it does not have any sizes.
>
>   Matt
>
>
>> 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
>>>
>>
>>
>
>
> --
> 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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