[petsc-users] preconditioning with Matrix-Free SNES

[Matthew Knepley]

On Wed, Jun 13, 2012 at 1:46 AM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> You are right! I do calculate the Jacobian and Preconditioning matrice in
> FormJacobian function with Mat context. When I used "-snes_mf_operator" I
> received the error:
>

Right, you only want to assemble the preconditioning matrix if you use MF.

   Matt


> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: No support for this operation for this object type!
> [0]PETSC ERROR: Mat type mffd!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 3, Fri Sep 30 10:28:33
> CDT 2011
> [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: ./code on a linux-gnu named behzad-desktop by behzad Tue
> Jun 12 22:01:48 2012
> [0]PETSC ERROR: Libraries linked from
> /home/behzad/softs/petsc/linux-gnu-cxx-debug/lib
> [0]PETSC ERROR: Configure run at Sat Dec 17 10:21:01 2011
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --download-f2cblaslapack=1 --download-mpich=1 --download-hypre
> --download-parms --with-clanguage=cxx -with-debugging=no
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: MatZeroEntries() line 5186 in src/mat/interface/matrix.c
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
> probably memory access out of range
> [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
> [0]PETSC ERROR: or see
> http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#valgrind[0]PETSCERROR: or try
> http://valgrind.org on GNU/linux and Apple Mac OS X to find memory
> corruption errors
> [0]PETSC ERROR: configure using --with-debugging=yes, recompile, link, and
> run
> [0]PETSC ERROR: to get more information on the crash.
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Signal received!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 3, Fri Sep 30 10:28:33
> CDT 2011
> [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: ./code on a linux-gnu named behzad-desktop by behzad Tue
> Jun 12 22:01:48 2012
> [0]PETSC ERROR: Libraries linked from
> /home/behzad/softs/petsc/linux-gnu-cxx-debug/lib
> [0]PETSC ERROR: Configure run at Sat Dec 17 10:21:01 2011
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --download-f2cblaslapack=1 --download-mpich=1 --download-hypre
> --download-parms --with-clanguage=cxx -with-debugging=no
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: User provided function() line 0 in unknown directory
> unknown file
> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
> [cli_0]: aborting job:
> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
> make: [run] Error 59 (ignored)
>
>
>
> On Tue, Jun 12, 2012 at 8:47 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
>> On Tue, Jun 12, 2012 at 11:12 AM, behzad baghapour <
>> behzad.baghapour at gmail.com> wrote:
>>
>>> Thank you. Now, I received the error which I should change Mat into mffd.
>>
>>
>> *Always* include the entire error message!
>>
>> You have to assemble a matrix to use most preconditioners.
>>
>
>


-- 
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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