[petsc-users] preconditioning with Matrix-Free SNES

[behzad baghapour]

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:


[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.
>
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