[petsc-users] Using FAS with SNES

[Karin&NiKo]

Dear All,

In order to ease the investigation, I reproduced this segfault by running
snes/examples/tutorials/ex1f.F with the option -snes_type fas.
I have the feeling that this is due to the nullity of the context object of
FormJacobian (PETSC_NULL_OBJECT in Fortran).

Best regards,
Nicolas

2017-06-01 16:30 GMT+02:00 Karin&NiKo <niko.karin at gmail.com>:

> Dear PETSc team,
>
> I have interfaced our fortran legacy code with PETSC SNES. I mainly
> followed the examples you provide. What I conceptually used is :
>
> ------------------------------------------------------------
> --------------------------------------------------------------------------
>
>     call SNESCreate(PETSC_COMM_WORLD,snes,ierr)
>
>     call SNESSetFromOptions(snes,ierr)
>
>     call SNESSETFunction(snes, pf, nonlinFormFunction, PETSC_NULL_OBJECT,
> ierr)
>
>     call SNESSetJacobian(snes, mat, mat, nonlinFormJacobian,
> PETSC_NULL_OBJECT, ierr)
>
>     call SNESSetKSP(snes, myksp, ierr)
> ------------------------------------------------------------
> --------------------------------------------------------------------------
>
> The code runs fine with -snes_type newtonls or newtontr. But when using
> -snes_type fas, it complains with the message :
>
> ------------------------------------------------------------
> --------------------------------------------------------------------------
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Corrupt argument: http://www.mcs.anl.gov/petsc/
> documentation/faq.html#valgrind
> [0]PETSC ERROR: Fortran callback not set on this object
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.7.2, Jun, 05, 2016
> [0]PETSC ERROR:
>
>
>
> on a arch-linux2-c-debug named dsp0780450 by niko Thu Jun  1 16:18:43 2017
> [0]PETSC ERROR: Configure options --prefix=/home/niko/dev/
> codeaster-prerequisites/petsc-3.7.2/Install --with-mpi=yes --with-x=yes
> --download-ml=/home/niko/dev/codeaster-prerequisites/petsc-3.7.2/ml-6.2-p3.tar.gz
> --with-mumps-lib="-L/home/niko/dev/codeaster-prerequisites/v13/
> prerequisites/Mumps-502_consortium_aster1/MPI/lib -lzmumps -ldmumps
> -lmumps_common -lpord -L/home/niko/dev/codeaster-prerequisites/v13/
> prerequisites/Scotch_aster-604_aster6/MPI/lib -lesmumps -lptscotch
> -lptscotcherr -lptscotcherrexit -lscotch -lscotcherr -lscotcherrexit
> -L/home/niko/dev/codeaster-prerequisites/v13/prerequisites/Parmetis_aster-403_aster/lib
> -lparmetis -L/home/niko/dev/codeaster-prerequisites/v13/
> prerequisites/Metis_aster-510_aster1/lib -lmetis -L/usr/lib
> -lscalapack-openmpi -L/usr/lib -lblacs-openmpi -lblacsCinit-openmpi
> -lblacsF77init-openmpi -L/usr/lib/x86_64-linux-gnu -lgomp "
> --with-mumps-include=/home/niko/dev/codeaster-prerequisites/v13/
> prerequisites/Mumps-502_consortium_aster1/MPI/include
> --with-scalapack-lib="-L/usr/lib -lscalapack-openmpi"
> --with-blacs-lib="-L/usr/lib -lblacs-openmpi -lblacsCinit-openmpi
> -lblacsF77init-openmpi" --with-blas-lib="-L/usr/lib -lopenblas -lcblas"
> --with-lapack-lib="-L/usr/lib -llapack"
> [0]PETSC ERROR: #1 PetscObjectGetFortranCallback() line 263 in
> /home/niko/dev/codeaster-prerequisites/petsc-3.7.2/src/
> sys/objects/inherit.c
> [0]PETSC ERROR: #2 oursnesjacobian() line 105 in /home/niko/dev/codeaster-
> prerequisites/petsc-3.7.2/src/snes/interface/ftn-custom/zsnesf.c
> [0]PETSC ERROR: #3 SNESComputeJacobian() line 2312 in
> /home/niko/dev/codeaster-prerequisites/petsc-3.7.2/src/
> snes/interface/snes.c
> [0]PETSC ERROR: #4 SNESSolve_NEWTONLS() line 228 in
> /home/niko/dev/codeaster-prerequisites/petsc-3.7.2/src/snes/impls/ls/ls.c
> [0]PETSC ERROR: #5 SNESSolve() line 4008 in /home/niko/dev/codeaster-
> prerequisites/petsc-3.7.2/src/snes/interface/snes.c
> [0]PETSC ERROR: #6 SNESFASDownSmooth_Private() line 512 in
> /home/niko/dev/codeaster-prerequisites/petsc-3.7.2/src/
> snes/impls/fas/fas.c
> [0]PETSC ERROR: #7 SNESFASCycle_Multiplicative() line 816 in
> /home/niko/dev/codeaster-prerequisites/petsc-3.7.2/src/
> snes/impls/fas/fas.c
> [0]PETSC ERROR: #8 SNESSolve_FAS() line 987 in /home/niko/dev/codeaster-
> prerequisites/petsc-3.7.2/src/snes/impls/fas/fas.c
> [0]PETSC ERROR: #9 SNESSolve() line 4008 in /home/niko/dev/codeaster-
> prerequisites/petsc-3.7.2/src/snes/interface/snes.c
> ------------------------------------------------------------
> --------------------------------------------------------------------------
>
> When exploring a little bit with a debugger, it seems that the object
> snes->vec_rhs which is used is fas.c is a null pointer.
>
> What is this object vec_rhs and how to set it?
>
> Thank you in advance,
> Nicolas
>
>
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