[petsc-users] ksp solve error with nested matrix

[Barry Smith]

> On Feb 8, 2017, at 11:39 PM, Dave May <dave.mayhem23 at gmail.com> wrote:
> 
> Any time you modify one of the submats, you need to call assembly begin/end on that sub matrix AND on the outer matnest object.

   Weird, and prone to errors it seems to me. Perhaps this needs to be rethought

> 
> Thanks,
>   Dave
> 
> 
> On Wed, 8 Feb 2017 at 22:51, Manav Bhatia <bhatiamanav at gmail.com> wrote:
> aha.. that might be it.
> 
> Does that need to be called for the global matrix after each assembly of the Jacobian blocks, or just once for the whole matrix?
> 
> -Manav
> 
> > On Feb 8, 2017, at 3:47 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> >
> >
> >> On Feb 8, 2017, at 3:40 PM, Manav Bhatia <bhatiamanav at gmail.com> wrote:
> >>
> >> Hi,
> >>
> >>   I have a nested matrix with 2x2 blocks. The blocks (1,1) and (2,2) are AIJ matrices and blocks (1,2) and (2,1) and shell matrices. I am calling the code with the following arguments: -pc_type fieldsplit , and get the error shown below.
> >>
> >>   I see that the error is complaining about the matrix being in unassembled state, but I think I am initializing and calling assembly end routines on both the diagonal blocks. Still, there is something obvious I am missing.
> >
> >  It is complaining about the outer most matrix, not the blocks. Perhaps you haven't finished with setting up your nest matrix?
> >
> >>
> >>   I would appreciate any guidance on this.
> >>
> >> Regards,
> >> Manav
> >>
> >>
> >>
> >> [1;31m[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> >> [0;39m[0;49m[0]PETSC ERROR: Object is in wrong state
> >> [0]PETSC ERROR: Not for unassembled matrix
> >> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> >> [0]PETSC ERROR: Petsc Release Version 3.7.4, Oct, 02, 2016
> >> [0]PETSC ERROR: /Users/manav/Library/Developer/Xcode/DerivedData/MAST-crggwcqrouiyeucduvscdahjauvx/Build/Products/Debug/examples on a arch-darwin-cxx-opt named Dhcp-90-250.HPC.MsState.Edu by manav Wed Feb  8 15:28:04 2017
> >> [0]PETSC ERROR: Configure options --prefix=/Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/../ --CC=mpicc-openmpi-clang38 --CXX=mpicxx-openmpi-clang38 --FC=mpif90-openmpi-clang38 --with-clanguage=c++ --with-fortran=0 --with-mpiexec=/opt/local/bin/mpiexec-openmpi-clang38 --with-shared-libraries=1 --with-x=1 --with-x-dir=/opt/X11 --with-debugging=0 --with-lapack-lib=/usr/lib/liblapack.dylib --with-blas-lib=/usr/lib/libblas.dylib --download-superlu=yes --download-superlu_dist=yes --download-suitesparse=yes --download-mumps=yes --download-scalapack=yes --download-parmetis=yes --download-metis=yes --download-hypre=yes --download-ml=yes
> >> [0]PETSC ERROR: #1 MatMult() line 2248 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/mat/interface/matrix.c
> >> [0]PETSC ERROR: #2 PCApplyBAorAB() line 717 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/ksp/pc/interface/precon.c
> >> [0]PETSC ERROR: #3 KSP_PCApplyBAorAB() line 274 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/include/petsc/private/kspimpl.h
> >> [0]PETSC ERROR: #4 KSPGMRESCycle() line 156 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/ksp/ksp/impls/gmres/gmres.c
> >> [0]PETSC ERROR: #5 KSPSolve_GMRES() line 240 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/ksp/ksp/impls/gmres/gmres.c
> >> [0]PETSC ERROR: #6 KSPSolve() line 656 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/ksp/ksp/interface/itfunc.c
> >> [0]PETSC ERROR: #7 SNESSolve_NEWTONLS() line 230 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/snes/impls/ls/ls.c
> >> [0]PETSC ERROR: #8 SNESSolve() line 4005 in /Users/manav/Documents/codes/numerical_lib/petsc/petsc-3.7.4/src/snes/interface/snes.c
> >>
> >
>