[petsc-dev] -log_view not working when setting using PetscOptionsSetValue( )

[Matthew Knepley]

On Wed, Aug 21, 2024 at 1:15 PM Angus, Justin Ray via petsc-dev <
petsc-dev at mcs.anl.gov> wrote:

> Hello,
>
>
>
> I’ve been able to successfully use -log_view in a cpp code using PETSc
> when setting it through a .petscrc file. I get lots of information about
> the SNES and KS solvers at the end of my simulation as expected.
>
>
>
> However, if I instead try to turn on log_view from inside my cpp code,
> using something like
>
>
>
> PetscInitialize(&a_argc,&a_argv,(char*)0,help);
>
> PetscOptionsSetValue( NULL, "-log_view" , NULL );
>
> PetscFinalize();
>
>
>
> Then I get the following message at the end of my simulation
>
>
>
> [5]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
>
> [5]PETSC ERROR: Object is in wrong state
>
> [5]PETSC ERROR: A PetscLogHandler of type default has not been started.
>
> [5]PETSC ERROR: See https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!emwZ3QQIbMQF7ZH_8EyWu8LQEDYtiAM1sng6x0gtfM7GkGaouwGe-sWN4dVHH9h8fT2qaL-czNUjeHazex8N$ 
> <https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ZOx9FLrofB1s1oTVLL6psn-36zBbHH9WiAgg1Arjda5O4RvYo1Na8aJgC4P_Ractdr7HCa0C-aPq9oVsiUcnlQ$>
> for trouble shooting.
>
>
>
>
>
> What am I doing wrong here?
>

This is a limitation of PETSc. We want the log to be setup early so it is
processed inside PetscInitialize(). For things like
this is usually use the environment,

  PETSC_OPTIONS="-log_view" ./myexe

  Thanks,

    Matt


> Thank you.
>
>
>
> -Justin
>
>
>
>
>


-- 
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

https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!emwZ3QQIbMQF7ZH_8EyWu8LQEDYtiAM1sng6x0gtfM7GkGaouwGe-sWN4dVHH9h8fT2qaL-czNUjeKliLdRa$  <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!emwZ3QQIbMQF7ZH_8EyWu8LQEDYtiAM1sng6x0gtfM7GkGaouwGe-sWN4dVHH9h8fT2qaL-czNUjeKcwJEGc$ >
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