wrote in message
news:5dfd1779-9442-4858-9161-8f1a06d56...@googlegroups.com...
Le dimanche 19 août 2012 19:03:34 UTC+2, Blind Anagram a écrit :
"Steven D'Aprano" wrote in message
news:502f8a2a$0$29978$c3e8da3$54964...@news.astraweb.com...
On Sat, 18 Aug 2012 01:09:26 -0700, wxjmfauth wrote:
[...]
If you can consistently replicate a 100% to 1000% slowdown in string
handling, please report it as a performance bug:
http://bugs.python.org/
Don't forget to report your operating system.
====================================================
For interest, I ran your code snippets on my laptop (Intel core-i7 1.8GHz)
running Windows 7 x64.
Running Python from a Windows command prompt, I got the following on
Python
3.2.3 and 3.3 beta 2:
python33\python" -m timeit "('abc' * 1000).replace('c', 'de')"
10000 loops, best of 3: 39.3 usec per loop
python33\python" -m timeit "('ab…' * 1000).replace('…', '……')"
10000 loops, best of 3: 51.8 usec per loop
python33\python" -m timeit "('ab…' * 1000).replace('…', 'x…')"
10000 loops, best of 3: 52 usec per loop
python33\python" -m timeit "('ab…' * 1000).replace('…', 'œ…')"
10000 loops, best of 3: 50.3 usec per loop
python33\python" -m timeit "('ab…' * 1000).replace('…', '€…')"
10000 loops, best of 3: 51.6 usec per loop
python33\python" -m timeit "('XYZ' * 1000).replace('X', 'éç')"
10000 loops, best of 3: 38.3 usec per loop
python33\python" -m timeit "('XYZ' * 1000).replace('Y', 'p?')"
10000 loops, best of 3: 50.3 usec per loop
python32\python" -m timeit "('abc' * 1000).replace('c', 'de')"
10000 loops, best of 3: 24.5 usec per loop
python32\python" -m timeit "('ab…' * 1000).replace('…', '……')"
10000 loops, best of 3: 24.7 usec per loop
python32\python" -m timeit "('ab…' * 1000).replace('…', 'x…')"
10000 loops, best of 3: 24.8 usec per loop
python32\python" -m timeit "('ab…' * 1000).replace('…', 'œ…')"
10000 loops, best of 3: 24 usec per loop
python32\python" -m timeit "('ab…' * 1000).replace('…', '€…')"
10000 loops, best of 3: 24.1 usec per loop
python32\python" -m timeit "('XYZ' * 1000).replace('X', 'éç')"
10000 loops, best of 3: 24.4 usec per loop
python32\python" -m timeit "('XYZ' * 1000).replace('Y', 'p?')"
10000 loops, best of 3: 24.3 usec per loop
This is an average slowdown by a factor of close to 2.3 on 3.3 when
compared
with 3.2.
I am not posting this to perpetuate this thread but simply to ask whether,
as you suggest, I should report this as a possible problem with the beta?
I use win7 pro 32bits in intel?
Thanks for reporting these numbers.
To be clear: I'm not complaining, but the fact that
there is a slow down is a clear indication (in my mind),
there is a point somewhere.
====================================
I may be reading your input wrongly, but it seems to me that you are not
only reporting a slowdown but you are also suggesting that this slowdown is
the result of bad design decisions by the Python development team.
I don't want to get involved in the latter part of your argument because I
am convinced that the Python team are doing their very best to find a good
compromise between the various design constraints that they face in meeting
these needs.
Nevertheless, the post that I responded to contained the suggestion that
slowdowns above 100% (which I took as a factor of 2) would be worth
reporting as a possible bug. So I thought that it was worth asking about
this as I may have misunderstood the level of slowdown that is worth
reporting. There is also a potential problem in timings on laptops with
turbo-boost (as I have), although the times look fairly consistent.
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