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

Satish Balay balay at mcs.anl.gov
Mon Mar 2 12:03:30 CST 2015

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:

real   1m4.681s
user   0m27.292s
sys    0m22.514s


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]..


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