On Wednesday 10 June 2009 16:31:31 AchipA wrote:
> > > > So on my laptop try:except: function loses about 5% to regex -
> > > > probably it depends on hardware/OS.
> > >
> > > Interesting, which python/platform are you using ?
> >
> > Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
> > [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
>
> Hm, is it perhaps 32bit ? That could be related to int performance...
Yes. 64-bit OS was too buggy so after several attempts I gave up and continued
using 32bit.
> > > b...@black:/tmp$ python -m timeit "s=[str(i) for i in range(10000)]"
> > > "import re" "integer_pat=re.compile('[+-]?[0-9]{1,15}$')"
> > > "is_integer=integer_pat.match"
> > > 100 loops, best of 3: 3.64 msec per loop
> >
> > Hmm? No loop...
>
> Timeit loops, it is looping over your code. So, the above means timeit
> ran the code 100 times.
>
> > I'm sorry, how do you get 6.2x?
> > 9.87/ 4.63 =2.13 here...
>
> Subtract the init (3.6msec) time from both. just wanted to avoid the
> extra cost of the import. However, even when doing it 'more right' I'm
> getting a significantly larger number (although unlike my firrst
> example this does not take into account the varying length of
> strings).
I see. I'm not sure if we are allowed to do that (substraction) though.
> blinky:~# python -m timeit -s "import re" -s "integer_pat=re.compile
> ('[0-9]+$')" -s "is_integer=integer_pat.match" "is_integer('123')"
> 1000000 loops, best of 3: 0.574 usec per loop
> blinky:~# python -m timeit "'123'.isdigit()"
> 10000000 loops, best of 3: 0.141 usec per loop
>
> The problem of your methodology (timing a total run) is that you're
> averaging out results and polluting the results with load noise from
> the OS and other apps. Timeit (among other neat tricks) counts the
> timing of the *BEST* iterations. If one was slower than the other,
> that means that the other got interrupted somewhere (disk, app,
> multitaskting, etc).
>
> See http://docs.python.org/library/timeit.html , it's quite useful.
I was wondering during my previous testing if I should use only 'minimal'
time. Thank you for the link, will read.
--
Sincerely yours
Alexey Nezhdanov
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