dolfin team mailing list archive

[Johannes Ring <johannr@xxxxxxxxx>]

On Tue, Jun 29, 2010 at 12:41 PM, Anders Logg <logg@xxxxxxxxx> wrote:
> 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.

Yes, that's right. I have reduced the size and will backport the benchmark.

Johannes

> 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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