Hi, I added gcc 4.2 from the openSUSE 10.1 repository so I now have both the 4.1.2 and 4.2.1 compilers installed. But still have glibc-2.4-31.1 installed. I see your result with 4.2.1 but not with 4.1.2 so I think that there could be a difference in the compiler flags. I don't know enough about those to help but I can test any suggestions.
$ gcc --version gcc (GCC) 4.1.2 20070115 (prerelease) (SUSE Linux) $ gcc -O3 sort-string-bench.c -o sort412 $ ./sort412 Benchmark with 1000000 strings of size 15 C qsort with C style compare: 0.630000 C qsort with Python style compare: 0.640000 NumPy newqsort: 0.360000 $ gcc-4.2 --version gcc-4.2 (GCC) 4.2.1 (SUSE Linux) $ gcc-4.2 -O3 sort-string-bench.c -o sort421 $ ./sort421 Benchmark with 1000000 strings of size 15 C qsort with C style compare: 0.620000 C qsort with Python style compare: 0.610000 NumPy newqsort: 0.550000 This is the same as: $ gcc-4.2 -O2 -finline-functions sort-string-bench.c -o sort421 $ ./sort421 Benchmark with 1000000 strings of size 15 C qsort with C style compare: 0.710000 C qsort with Python style compare: 0.700000 NumPy newqsort: 0.550000 (NumPy newqsort with -O2 alone is 0.60000) For completeness, 4.1.2 using '-O2' versus '-O2 -finline-functions' is NumPy newqsort: 0.620000 vs NumPy newqsort: 0.500000 Regards Bruce On Feb 13, 2008 4:35 AM, Francesc Altet <[EMAIL PROTECTED]> wrote: > A Tuesday 12 February 2008, Bruce Southey escrigué: > > Hi, > > > > I have a Opteron 248 (2.66GHz) that with gcc 4.1.0 (SUSE10.1?) that > > gives C qsort with C style compare: 0.650000 > > C qsort with Python style compare: 0.640000 > > NumPy newqsort: 0.360000 > > That's very intersting. In a similar configuration, but using SuSe 10.3 > (Enterprise) instead of 10.1, I don't see this factor of almost 2 of > difference in performance (in fact, both performances, C qsort and > NumPy newqsort, are very similar). > > This seems to confirm that the GNU glibc crew has fixed the qsort > performance very recently (i.e. I hope it is not only a fix in SuSe > 10.3 Enterprise), and this is why most of current distros are seeing > the poor performance in qsort. > > > Cheers, > > -- > >0,0< Francesc Altet http://www.carabos.com/ > V V Cárabos Coop. V. Enjoy Data > "-" > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion