dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Jun 29, 2010 at 12:34:48PM +0200, Johannes Ring wrote:
> On Tue, Jun 29, 2010 at 11:16 AM, Anders Logg <logg@xxxxxxxxx> wrote:
> > On Tue, Jun 29, 2010 at 11:09:47AM +0200, Johannes Ring wrote:
> >> I backported this benchmark to 0.9.7 and it ran for over 17 minutes.
> >
> > !
> >
> > That's quite a good speedup. :-)
> >
> >> On DOLFIN-dev it run for about 55 seconds. Maybe we should reduce
> >> the
> >> problem size somewhat before I backport further?
> >
> > Sure, but not too much. I think we can improve it further (by a factor
> > 10 or so) and then it might run too quickly. I also suspect DOLFIN
> > 0.9.7 to be the slowest (or one of the slowest).
> >
> > Try reducing SIZE by a factor 2 or so.
>
> That reduced the runtime to just under nine minutes for 0.9.7 and 33
> seconds for bzr tip. I also tried DOLFIN 0.7.3 and it is as slow as
> 0.9.7.

Interesting. But I guess it's not a problem since you only have to run
it once to get the numbers.

Btw, I compared running with and without progress bar in a simple loop
that just does one addition per loop (like in the benchmark) and the
difference was a factor 3. Not sure if that is reasonable or not. It
depends on how much a function call should cost compared to adding two
numbers.

--
Anders

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