[petsc-users] Setting PETSc Sundials Options Using PETSC_OPTIONS

[Matthew Knepley]

On Thu, Jul 25, 2013 at 9:53 AM, Lesleis Nagy <l.nagy at ed.ac.uk> wrote:

> Hello,
>
> I currently use PETSc (version: 3.3-p7) and petsc4py along with the
> Sundials interface to perform time stepping for some FEM code that I have
> written (for completeness I make use of FEniCS). I would like to pass
> options to PETSc from the command line using the PETSC_OPTIONS environment
> variable. I set it with the following values:
>
>         $ export PETSC_OPTIONS="-ts_sundials_type bdf
> -ts_sundials_gramschmidt_type modified -ts_sundials_monitor_steps
> -options_table -options_left"
>
> I then run the code using:
>
>         $ mpiexec -n 2 python script.py
>
> Everything appears to work and my code terminates. However at the end of
> the run, '-options_table' / '-options_left' reports that
>
> #PETSc Option Table entries:
> -options_left
> -options_table
> -ts_sundials_gramschmidt_type modified
> -ts_sundials_monitor_steps
> -ts_sundials_type bdf
> #End of PETSc Option Table entries
> There are 3 unused database options. They are:
> Option left: name:-ts_sundials_gramschmidt_type value: modified
> Option left: name:-ts_sundials_monitor_steps no value
> Option left: name:-ts_sundials_type value: bdf
>
> Could someone explain to me why PETSc is reading the Sundials options that
> I've supplied but is not using them?
>

1) Your solver might have an options prefix

2) You might forget to call TSSetFromOptions()

The easiest thing to do is run with -start_in_debugger and set a breakpoint
in TSSetFromOptions()

   Matt


> Kind regards
> Les
> --
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
>


-- 
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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