[petsc-users] check for NULL pointer in VecCreateGhost

[Mohammad Mirzadeh]

Just if wondering what the actual code is, here's the bit causing the
trouble:

AOApplicationToPetsc(ao, ghostNodes.size(), (int*)ghostNodes);
VecCreateGhost(comm, localNodes.size(), PETSC_DECIDE, ghostNodes.size(),
(int*)ghostNodes, &v);
AOPetscToApplication(ao, ghostNodes.size(), (int*)ghostNodes);

when the code is in serial, ghostNodes.size() = 0 and (int*)ghostNodes =
NULL.


On Mon, Feb 20, 2012 at 3:54 PM, Mohammad Mirzadeh <mirzadeh at gmail.com>wrote:

> Sure, Jed. My bad. Here's the whole message when the code is run in
> _serial_:
>
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Invalid pointer!
> [0]PETSC ERROR: Null Pointer: Parameter # 3!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 6, Wed Jan 11 09:28:45
> CST 2012
> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ./petsc on a arch-linu named mohammad-laptop by mohammad
> Mon Feb 20 15:52:25 2012
> [0]PETSC ERROR: Libraries linked from
> /home/mohammad/soft/petsc-3.2-p6/arch-linux2-cxx-debug/lib
> [0]PETSC ERROR: Configure run at Thu Feb 16 02:16:40 2012
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --with-clanguage=cxx --download-f-blas-lapack=1
> --download-mpich=1 --download-hypre=1 --download-ml=1
> --with-parmetis-include=/home/mohammad/soft/parmetis/include
> --with-parmetis-lib="-L/home/mohammad/soft/parmetis/lib -lparmetis -lmetis"
> --download-superlu_dist=1
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: AOApplicationToPetsc() line 249 in
> /home/mohammad/soft/petsc-3.2-p6/src/dm/ao/interface/ao.c
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Invalid pointer!
> [0]PETSC ERROR: Null Pointer: Parameter # 3!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 6, Wed Jan 11 09:28:45
> CST 2012
> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ./petsc on a arch-linu named mohammad-laptop by mohammad
> Mon Feb 20 15:52:25 2012
> [0]PETSC ERROR: Libraries linked from
> /home/mohammad/soft/petsc-3.2-p6/arch-linux2-cxx-debug/lib
> [0]PETSC ERROR: Configure run at Thu Feb 16 02:16:40 2012
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --with-clanguage=cxx --download-f-blas-lapack=1
> --download-mpich=1 --download-hypre=1 --download-ml=1
> --with-parmetis-include=/home/mohammad/soft/parmetis/include
> --with-parmetis-lib="-L/home/mohammad/soft/parmetis/lib -lparmetis -lmetis"
> --download-superlu_dist=1
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: AOPetscToApplication() line 210 in
> /home/mohammad/soft/petsc-3.2-p6/src/dm/ao/interface/ao.c
>
>
> It seems to complain about the 3rd parameter of AOApplicationToPetsc()
> and AOPetscToApplication(). VecCreateGhost, on the other hand, is fine.
>
> On Mon, Feb 20, 2012 at 3:47 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
>> On Mon, Feb 20, 2012 at 17:25, Mohammad Mirzadeh <mirzadeh at gmail.com>wrote:
>>
>>> Hi,
>>>
>>> Is there an internal check to see if the 'ghost' pointer in
>>> VecCreateGhost() is NULL ? This can happen, for example, if the code is run
>>> in serial and the there are no ghost points (hence n_ghost = 0 and ghost =
>>> NULL(implementation dependent of course) ). AOXXXXToYYYY functions seem to
>>> crash if the corresponding pointer is NULL.
>>>
>>
>> Always send the whole error message.
>>
>
>
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