[petsc-dev] related to compiling your source code

[Mark Adams]

On Tue, Apr 14, 2015 at 8:17 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   Mark,
>
>     You have not addressed the issue of people have a stale PETSC_OPTIONS.
> Why is that any less likely then a stale .petscrc?
>

I think I said this: people use their home directories as *scratch space*.
You download an email of a petscrc file, untar something, scp something,
however you move files around.
You do not use your .bashrc file as a *scratch pad*.

And, no one uses PETSC_OPTIONS (I've been using PETSc for 20 years and have
never heard of it until today!); everyone uses their home directory.


>
>
>    Barry
>
>   Note that based on our experiences with ./configure people generally
> have lots and lots of stale environmental variables set in their .bashrc
> that they don't know about. Hence we turn them all off before starting
> ./configure
>
> > On Apr 14, 2015, at 6:52 PM, Mark Adams <mfadams at lbl.gov> wrote:
> >
> >
> >
> > On Tue, Apr 14, 2015 at 5:51 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> >
> > > On Apr 14, 2015, at 4:45 PM, Mark Adams <mfadams at lbl.gov> wrote:
> > >
> > >
> > > >
> > > > This has never been a problem.
> > >
> > >    I suspect this is because almost no one knows about PETSC_OPTIONS
> and uses it.
> > >
> > >
> > > This could be a migration path for people using ~/.petscrc ...
> >
> >   So people start using PETSC_OPTIONS. They do the same stupid thing of
> setting something and forget about a year later and then we have to remove
> PETSC_OPTIONS.  Why do we want to migrate them to something just as
> dangerous?
> >
> >
> > Do we have any idea of the number of users that use ~/.petscrc ?
> >
> > If no one is using it other than us then we switch and there is no
> problem.  I have never thought of using it.  I never have global options
> that I always want to use like this.  Does anyone other than us for
> regression tests?
> >
> > The problem we have seen is someone has some temporary junk in their
> home directory and it gets picked up.  No one uses .bashrc as a scratch pad
> but people do use their home directory this way.
> >
>
>
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