[petsc-users] PETSc/petsc4py error detection

[Matthew Knepley]

On Tue, Aug 26, 2014 at 1:33 AM, Nicola Creati <ncreati at inogs.it> wrote:

> Hello,
> I'm writing a large application in Python that uses petsc4py to solve some
> equations. Running my code I note that PETSc detects errors in sections (I
> believe in Cython extensions and packages) where petsc4py is not imported
> or used. I do not need to fix the problem, I already did it. Is there a way
> to avoid petsc4py/PETSc to catch errors in not PETSc sections of the code?
> This is an example of the error message I got:
>
> [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: likely location of problem given in stack below
> [0]PETSC ERROR: ---------------------  Stack Frames
> ------------------------------------
> [0]PETSC ERROR: Note: The EXACT line numbers in the stack are not
> available,
> [0]PETSC ERROR:       INSTEAD the line number of the start of the function
> [0]PETSC ERROR:       is given.
> --------------------------------------------------------------------------
> mpiexec noticed that process rank 0 with PID 25694 on node daisy exited on
> signal 11 (Segmentation fault).
> --------------------------------------------------------------------------
>
> I'm using Python 2.7.6, petsc4py 3.4 and PETSc 3.4.3.
>

http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscPopSignalHandler.html

  Thanks,

    Matt


> Thanks.
>
> Nicola
>
> --
> _____________________________________________________________________
> Nicola Creati
> Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS
> IRI (Ricerca Teconologica e Infrastrutture) Department
> B.go Grotta Gigante - Brisciki 42/c
> 34010 Sgonico - Zgonik (TS) - Italy
> Tel. +39-0402140213
> Fax  +39-040327307
>
>


-- 
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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