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Re: polyhedron benchmark | results queries...


Hi,

Evan Cooch wrote:
>>> So, that is part of the issue - by can the difference between 4.1.1
>>> and 4.2.0 alone be responsible for the order or magnitidue
>>> difference in times for the two first tests (ac and aermod)?
> But, I'm guessing (based on the following)
> http://physik.fu-berlin.de/~tburnus/benchmark/polyhedron05.html
> that this isn't the case.
I didn't remember having that page ...

On that page I had 4.1.0 and 4.2.0 20060504
I have an AMD Athlon64 4800+ (2.4 GHz)

For ac:
gfortran 4.2    13.14
gfortran 4.1.0 13.94
gfortran 4.3 (today): 14.05
2006-2007:
http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-ac-3.png
Your result: 37.48s (Opteron 885, 2.6 clock)
Polyhedron: 11.22s (Opteron 256, 3 GHz clock)

There is indeed hardly any change over time and your version is 3 times
slower ?!?


For aermod:
gfortran 4.2:    44.36s
gfortran 4.1.0: 45.67s
gfortran 4.3: 35.20s  (two days ago as it is currently crashing)
2006-2007:
http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html
Your result: 54.77s (Opteron 885, 2.6 clock)
Polyhedron: 37.64s (Opteron 256, 3 GHz clock)

One sees an improvement around August 2006 of ~23%. Still, your computer
should be rather faster than slower as mine?!?


For AC I have actually no idea why there is such a huge difference
(factor 3) to my and Polyhedron's results. For aermod this might be
partially due to the improvements in gfortran.

The other numbers look quite ok, for fatigue we had a couple of
improvements; for induct we hadn't but your system is still
significantly slower. Why?

For a comparison between 4.1.0 / 4.1.2 and the current developer version
(first 4.2, now 4.3), you can have a look at:
http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html

Tobias


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