[Facets-devel] PETSC ERROR

[Matthew Knepley]

On Thu, Jun 4, 2009 at 4:51 PM, Satish Balay <balay at mcs.anl.gov> wrote:

> On Thu, 4 Jun 2009, Matthew Knepley wrote:
>
> > > > Why would the user give an argument for optfile, but not intend it to
> be
> > > > found?
> > >
> > > Normally command line options is the way to pass in optional flags to
> > > a petsc binary. In this application - command line options are not
> > > possible [due to python/other packages that control main] - hence an
> > > PetscIntialize("petscopt") is used to pass in equivalent optional
> > > flags.
> > >
> > >
> > > Also In this code - PETSc [solver] usage is optional. I guess there
> > > are 2 ways of implementing this.
> > >
> > > The first is to always call PetscInitialize()/Finalize() - but
> > > optionally use PETSc solvers. [in this case optfile should be
> > > optional]
> >
> >
> > I have no idea what you mean here. Why does optfile have to be an
> > optional argument?  That makes no sense at all. You provide an
> > argument, but only want it used sometimes?  DONT PROVIDE IT if it
> > should not be used.
>
> Why is ~/.petscrc or PWD/.petscrc or commandline options optional?
> Same issue here.
>
> Perhaps I want to define a different name than the .file so that its
> visisble - and give it a unique name - so that its used by only this
> application [and not other petsc applications]
>
> Just giving reasons for why..


Wait, what reasons. Again, I cannot understand what you are saying., Code an
example.
Here is mine:

if (usingPETSc) {
  optfile = "myoptions.txt";
} else {
  optfile = PETSC_NULL;
}
PetscInitialize(optfile);

What is wrong with this? How can this not be possible?

  Matt


>
> In this case - perhaps pwd/.petscrc will suffice. I'll have to check.
>
> Satish
>
-- 
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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