[Numpy-discussion] String sort

Scott Ransom sransom@nrao....
Wed Feb 13 16:19:55 CST 2008


On Wednesday 13 February 2008 02:37:37 pm Francesc Altet wrote:
> So, I'd say that the guilty is the gcc 4.2.1, 64-bit (or at very
> least, AMD Opteron architecture) and that newqsort performs really
> well in general (provided that the compiler can find the best path
> for optimizing its code).  Anyone using a 64-bit platform and having
> both gcc 4.1.2 and 4.2.1 installed can confirm this?

Here are results from a 64-bit Debian system using a Core2 Duo 2.66 GHz 
processor.

I used gcc 3.4.6, 4.1.3, 4.2.3, and 4.3.0 (20080202 experimental) 
with -O2 and -O3.

Summary:  There is a big difference between -02 and -O3.  gcc-4.2 seems 
slightly better than the other gccs.  And the newqsort is a lot faster 
(always) than the libc version.

Scott

eiger:/data1$ ./sort346_O2
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.550000
C qsort with Python style compare: 0.530000
NumPy newqsort: 0.450000

eiger:/data1$ ./sort346_O3
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.550000
C qsort with Python style compare: 0.520000
NumPy newqsort: 0.350000

eiger:/data1$ ./sort413_O2
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.560000
C qsort with Python style compare: 0.530000
NumPy newqsort: 0.420000

eiger:/data1$ ./sort413_O3
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.540000
C qsort with Python style compare: 0.500000
NumPy newqsort: 0.280000

eiger:/data1$ ./sort423_O2
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.560000
C qsort with Python style compare: 0.530000
NumPy newqsort: 0.390000

eiger:/data1$ ./sort423_O3
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.530000
C qsort with Python style compare: 0.500000
NumPy newqsort: 0.270000

eiger:/data1$ ./sort43_O2
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.550000
C qsort with Python style compare: 0.530000
NumPy newqsort: 0.340000

eiger:/data1$ ./sort43_O3
Benchmark with 1000000 strings of size 15
C qsort with C style compare: 0.530000
C qsort with Python style compare: 0.510000
NumPy newqsort: 0.330000

-- 
Scott M. Ransom            Address:  NRAO
Phone:  (434) 296-0320               520 Edgemont Rd.
email:  sransom@nrao.edu             Charlottesville, VA 22903 USA
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