[petsc-users] How to set up -mat_mumps_icntl13 1 in the code?

[Giacomo Mulas]

Hi Barry.

On Mon, 14 May 2012, Barry Smith wrote:

>    src/snes/examples/tutorials/ex22.c is an example of how one can set options in the program and then have the command line options override them.

Thanks! I am looking at that right now.

>  PetscInitialize(&argc,&argv,PETSC_NULL,help);
>
>  /* Hardwire several options; can be changed at command line */
>  ierr = PetscOptionsInsertString(common_options);CHKERRQ(ierr);
>  ierr = PetscOptionsInsert(&argc,&argv,PETSC_NULL);CHKERRQ(ierr);

So, if I understand correctly, I am supposed to call
PetscOptionsInsertString() to add any options I want to have as defaults,
then what is the call PetscOptionsInsert() for? PetscOptionsInsertString()
does not have effect until PetscOptionsInsert() is called?
Another thing which is not clear to me: in that example,
PetscOptionsSetFromOptions() is called before these "hardwired" options are
inserted. So (unless I do not understand the logic) command line options are
applied before hardwired options are inserted. And then
PetscOptionsSetFromOptions() is not called again. Does it mean that
hardwired inserted options override the command line (since they come
after)? Am I supposed to also call again PetscOptionsSetFromOptions() after
inserting new options for the inserted options to come into effect?

Thanks in advance, bye
Giacomo

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Giacomo Mulas <gmulas at oa-cagliari.inaf.it>
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