[petsc-users] KSPSolve() passes in the dbg mode, but failed in opt mode

[Xujun Zhao]

Another interesting phenomenon is that it works for an iterative solver,
but only failed for direct solvers(both superLU_dist and mumps). If
something is not initialized correctly, why doesn't the iterative solver,
for example, GMRES, throw any errors?

On Mon, Jul 25, 2016 at 11:50 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Jul 25, 2016 at 9:17 AM, Xujun Zhao <xzhao99 at gmail.com> wrote:
>
>> Hi all,
>>
>> I am trying to solve my problem with a direct solver superLU_dist.
>> But the KSPSolve failed in the "opt" mode. I shifted to the "dbg" version
>> and wanted to see what error info I can get from the PETSc. Surprisingly,
>> it passed the solve and didn't output any errors in the "dbg" version. Does
>> anyone have the similar experience? and what type of potential bugs it may
>> have?
>>
>
> Debugging mode initializes all variables, but as Hong says, valgrind will
> warn you of uninitialized variables.
>
>    Matt
>
>
>>
>> --->test in StokesSolver::solve(): Start the KSP solve...
>>
>> [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/documentation/faq.html#valgrind
>>
>> [0]PETSC ERROR: 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: See http://www.mcs.anl.gov/petsc/documentation/faq.html
>> for trouble shooting.
>>
>> [0]PETSC ERROR: Petsc Release Version 3.7.2, unknown
>>
>> [0]PETSC ERROR: ./example-dbg on a arch-darwin-c-opt named
>> mcswl091.mcs.anl.gov by xzhao Mon Jul 25 11:10:12 2016
>>
>> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
>> --with-fc=gfortran --download-mpich --download-fblaslapack
>> --download-scalapack --download-mumps --download-superlu_dist
>> --download-hypre --download-ml --download-metis --download-parmetis
>> --download-triangle --download-chaco --with-debugging=0
>>
>> [0]PETSC ERROR: #1 User provided function() line 0 in  unknown file
>>
>> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
>>
>>
>>
>
>
> --
> 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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