[petsc-users] syntax for routine in PCMGSetResidual

[Matthew Knepley]

On Thu, Nov 12, 2015 at 7:56 PM, Timothée Nicolas <
timothee.nicolas at gmail.com> wrote:

> 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.
>

You should be able to trace back in the debugger to see what is sat as
pc->mat.

   Matt


> 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
>>
>
>


-- 
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20151112/b409515f/attachment-0001.html>