Path: csiph.com!usenet.pasdenom.info!news.albasani.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.001
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'exception': 0.03; 'python': 0.09; 'behave': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'terry': 0.09; 'subject:python': 0.11; '3.2.': 0.16; '3.3.': 0.16; 'comparison.': 0.16; 'devs': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'reedy': 0.16; 'subject:3.3': 0.16; 'subject:String': 0.16; 'later': 0.16; 'string': 0.17; 'wrote:': 0.17; 'bytes': 0.17; 'unicode': 0.17; 'jan': 0.18; '3.2': 0.22; 'please?': 0.22; 'nearly': 0.23; 'machine': 0.24; 'header:In-Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'am,': 0.27; '2.6': 0.27; 'functions.': 0.27; 'operations,': 0.27; 'header:X-Complaints- To:1': 0.28; 'chris': 0.28; 'run': 0.28; 'selecting': 0.29; 'expect': 0.31; 'to:addr:python-list': 0.33; 'faster': 0.35; 'received:org': 0.36; 'but': 0.36; 'subject:: ': 0.38; 'things': 0.38; 'to:addr:python.org': 0.39; 'space': 0.39; 'header:Received:5': 0.40; 'show': 0.63; 'confirm': 0.64; 'covers': 0.65; 'today': 0.67; 'received:fios.verizon.net': 0.84; 'notable': 0.91; 'rusi': 0.91; 'overall,': 0.93
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: String performance regression from python 3.2 to 3.3
Date: Thu, 14 Mar 2013 19:14:32 -0400
References: <23a42297-9262-4ace-87ad-138999b1ddd6@z3g2000vbg.googlegroups.com> <a1a6394a-e9c7-407b-9f6d-ff44de1b65de@y2g2000pbg.googlegroups.com> <eabe27a9-099a-4e2c-92fb-bdf3819c2561@kw7g2000pbb.googlegroups.com> <mailman.3259.1363172350.2939.python-list@python.org> <ee2062d1-658a-4bf5-8a56-5fe9c0991bef@o9g2000pbt.googlegroups.com> <CAPTjJmqEAdff+cH2NWtp0oX1ZvFzQJqPxNm=c8=XAm3j+GV1uQ@mail.gmail.com> <51411F38.1040901@mrabarnett.plus.com> <CAPTjJmoHhpRbQug5zBYUAnRrfe2G502E_k=zWdBxjf0oq-+MFA@mail.gmail.com> <mailman.3282.1363226492.2939.python-list@python.org> <51414c75$0$29965$c3e8da3$5496439d@news.astraweb.com> <mailman.3286.1363243635.2939.python-list@python.org> <7cd57e96-663b-4a3b-a2c8-2fdbf730fa9b@hd10g2000pbc.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: pool-173-75-251-66.phlapa.fios.verizon.net
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4
In-Reply-To: <7cd57e96-663b-4a3b-a2c8-2fdbf730fa9b@hd10g2000pbc.googlegroups.com>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.3325.1363302886.2939.python-list@python.org>
Lines: 20
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1363302886 news.xs4all.nl 6969 [2001:888:2000:d::a6]:57263
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:41250

On 3/14/2013 6:48 AM, rusi wrote:
> On Mar 14, 11:47 am, Chris Angelico <ros...@gmail.com> wrote:
> <snipped>
>> I expect that Python 3.2 will behave comparably to the 2.6 stats, but
>> I don't have 3.2s handy - can someone confirm please?
>
> I have 3.2 but not 3.3. Can run it later today if no one does.
> But better if someone with both on the same machine do the comparison.

The python devs use the microbenchmarks in 
Tools/stringbench/stringbench.py, which covers all string operations, as 
the basis for improving particular string functions. Overall, Unicode is 
nearly as fast as bytes and 3.3 as fast as 3.2. Find/replace is the 
notable exception in stringbench, so it is an anomaly. Other things are 
faster in 3.3.  In selecting the new implementation, the devs also 
considered space and speed gains that do not show up in microbenchmarks.

-- 
Terry Jan Reedy