[petsc-dev] Seeking OLCF users complaining about poor build times

[Matthew Knepley]

On Mon, Mar 2, 2015 at 12:03 PM, Satish Balay <balay at mcs.anl.gov> wrote:

> On Mon, 2 Mar 2015, Matthew Knepley wrote:
>
> > On Mon, Mar 2, 2015 at 11:00 AM, Aron Ahmadia <aron at ahmadia.net> wrote:
> >
> > > Another side-note.
> > >
> > > We have made some progress in pulling out some of the major external
> > > dependencies (SuperLU, hypre, Metis) into their own packages in
> HashDist,
> > > which has been helpful for speeding up rebuilds.  As others have noted,
> > > configure is the real killer for PETSc builds.
> > >
> >
> > I just pushed an update for parallel configure (using only 2 threads
> right
> > now) to next. We will see if the
> > builds blow up.
> >
>
> cool.. configure time on my laptop for a simple build reduced from:
>
> <master>
> real   1m4.681s
> user   0m27.292s
> sys    0m22.514s
>
> to:
>
> <next>
> real    0m39.509s
> user    0m24.133s
> sys     0m19.685s
>
>
>
> 'real' time is still longer than 'user' time - so presumably this will
> also benefit 'single' core machines [if any]..


Excellent. I will put in the flag for setting the number of threads. What
should
it be called? I was going to overload --useThreads=<num> to take a number.

  Thanks,

     Matt


>
> 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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