[petsc-users] PETSc/petsc4py error detection

[Nicola Creati]

On 08/26/2014 12:06 PM, Matthew Knepley wrote:
> On Tue, Aug 26, 2014 at 1:33 AM, Nicola Creati <ncreati at inogs.it 
> <mailto: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 <tel:%2B39-0402140213>
>     Fax +39-040327307 <tel:%2B39-040327307>
>
>
>
>
> -- 
> 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
Thank you, but PetscPopSignalHandler has not been wrapped in petsc4py.

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

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