[petsc-dev] [petsc-users] Using PETSC with an openMP program

[Matthew Knepley]

On Fri, Mar 2, 2018 at 2:02 PM, Jed Brown <jed at jedbrown.org> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
>
> > I guess my superficial response to this is
> >
> >   a) I do not consider Buildsystem "mine" anymore. I may still have the
> > most lines of code, but I am not even sure of that.
> >       However, I am interested in fixing problems, since I think it is
> > still the best available way to do these things.
> >
> >   b) Broad criticisms are very useful as a way to introduce specific
> > criticisms that can be worked on. Divorced from that
> >       grounding, they are much less useful.
> >
> >   c) I believe that you have a hard time making modifications. I would
> note
> > that this code has received a steady stream of
> >       updates for its entire existence, so it is not impossible, but
> > perhaps too hard.
>
> A lot of those updates have been hacking something in locally (leading
> to inconsistencies and varying assumptions) because refactoring is too
> intimidating.
>
> >   d) The particular problem you bring up is not that hard (I think) to
> fix.
> > You go into RDict, which is the place where all options
> >        are held. Put in a marker which gets set when the option is
> > accessed, just as we do in PETSc. The problem is really
> >        that configure is likely to produce many more false positives, as
> > people often put in things that might not be accessed.
> >        I am fine if that is what we want.
> >
> >   e) More broadly, the use of RDict is unrecognizable from the original
> > design that Barry and I did 14 years ago. I think we
> >       can just strip this out and replace it with something of equivalent
> > functionality which is simpler and smaller.
>
> Smaller and simpler would be fantastic.
>

On this note, I am saddened by the fact that no current options parsing
implementations has even this features, let alone other things that we do.
Are our needs to different from every other program?

   Matt

-- 
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://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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