[Numpy-discussion] String sort

Francesc Altet faltet@carabos....
Thu Feb 14 09:34:31 CST 2008


A Thursday 14 February 2008, escriguéreu:
> > In any case, if anybody have access to an Opteron machine and gcc
> > 4.2.3, it would be great if he can run the benchmark and contribute
> > his feedback.
>
> Here it is with gcc 4.2.3 on an Opteron 246 (2.0 GHz):
>
> uller:~$ ./sort423_O2    # with -O2
> Benchmark with 1000000 strings of size 15
> C qsort with C style compare: 0.770000
> C qsort with Python style compare: 0.740000
> NumPy newqsort: 0.630000
>
> uller:~$ ./sort423_O3    # with -O3
> Benchmark with 1000000 strings of size 15
> C qsort with C style compare: 0.640000
> C qsort with Python style compare: 0.660000
> NumPy newqsort: 0.400000

And here are my timings with gcc 4.1.3 and using a similar Opteron than 
yours (270 @ 2.0 GHz):

With -O2:
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.750000
C qsort with Python style compare: 0.700000
NumPy newqsort: 0.690000

With -O3:
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.670000
C qsort with Python style compare: 0.620000
NumPy newqsort: 0.380000

So, it seems clear that the GCC people has fixed in 4.2.3 the problem 
with the optimizer introduced in 4.2.1.  Very good!  

By the way, it's nice to see the wide range of platforms that this list 
allows to test out :-)

Cheers,

-- 
>0,0<   Francesc Altet     http://www.carabos.com/
V   V   Cárabos Coop. V.   Enjoy Data
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