Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #88274
| Path | csiph.com!usenet.pasdenom.info!news.redatomik.org!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!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 0.012 |
| X-Spam-Evidence | '*H*': 0.98; '*S*': 0.00; 'algorithm': 0.04; 'from:addr:yahoo.co.uk': 0.04; 'mentioned,': 0.07; '128': 0.09; 'lawrence': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'python': 0.11; 'language.': 0.14; '"in': 0.16; 'cases:': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'slight': 0.16; 'solver': 0.16; 'strategy:': 0.16; 'worst': 0.16; 'modification': 0.16; 'language': 0.16; 'wrote:': 0.18; 'result.': 0.19; 'example': 0.22; 'header:User-Agent:1': 0.23; 'replace': 0.24; 'header:X-Complaints-To:1': 0.27; 'header:In-Reply-To:1': 0.27; 'chris': 0.29; 'change,': 0.30; "i'm": 0.30; '(on': 0.31; 'dropped': 0.31; 'purely': 0.31; 'run': 0.32; 'running': 0.33; 'something': 0.35; 'but': 0.35; 'fun,': 0.36; "i'll": 0.36; 'should': 0.36; 'seconds': 0.37; 'two': 0.37; 'being': 0.38; 'to:addr:python-list': 0.38; 'recent': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'solve': 0.60; "you're": 0.61; 'first': 0.61; 'save': 0.62; 'times': 0.62; 'our': 0.64; 'more': 0.64; 'different': 0.65; '(that': 0.65; 'charset:windows-1252': 0.65; 'believe': 0.68; 'eight': 0.74; '5.9': 0.84; '884': 0.84; 'benchmark': 0.84; 'dramatically': 0.84; 'gut': 0.84; 'right).': 0.84; 'careful': 0.91 |
| X-Injected-Via-Gmane | http://gmane.org/ |
| To | python-list@python.org |
| From | Mark Lawrence <breamoreboy@yahoo.co.uk> |
| Subject | Re: Sudoku solver |
| Date | Sun, 29 Mar 2015 19:26:26 +0100 |
| References | <87r3sdnw5t.fsf@elektro.pacujo.net> <4e81bdb9-52db-46e6-b449-d4241cb2a3f2@googlegroups.com> <87twx8amww.fsf@elektro.pacujo.net> <82e7c5b9-2f0f-405b-859c-b74916c475e0@googlegroups.com> <R6HRw.1255136$4b6.945049@fx44.am4> <55176c2c$0$13009$c3e8da3$5496439d@news.astraweb.com> <ziRRw.1732061$BB2.522910@fx35.am4> <87619j7kbu.fsf@elektro.pacujo.net> |
| Mime-Version | 1.0 |
| Content-Type | text/plain; charset=windows-1252; format=flowed |
| Content-Transfer-Encoding | 7bit |
| X-Gmane-NNTP-Posting-Host | host-78-147-178-243.as13285.net |
| User-Agent | Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
| In-Reply-To | <87619j7kbu.fsf@elektro.pacujo.net> |
| X-BeenThere | python-list@python.org |
| X-Mailman-Version | 2.1.19 |
| Precedence | list |
| List-Id | General discussion list for the Python programming language <python-list.python.org> |
| List-Unsubscribe | <https://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 | <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.311.1427653605.10327.python-list@python.org> (permalink) |
| Lines | 48 |
| NNTP-Posting-Host | 2001:888:2000:d::a6 |
| X-Trace | 1427653605 news.xs4all.nl 2821 [2001:888:2000:d::a6]:38345 |
| X-Complaints-To | abuse@xs4all.nl |
| Xref | csiph.com comp.lang.python:88274 |
Show key headers only | View raw
On 29/03/2015 19:03, Marko Rauhamaa wrote: > BartC <bc@freeuk.com>: > >> As Chris mentioned, when I say 'faster than C', I mean X running my >> algorithm was faster then C running Marko's algoritim (on Ian's data). >> This was just an illustration of algorithm being more important than >> language. > > Be careful with the benchmark comparisons. Ian's example can be solved > with the identical algorithm in eight different ways (four corners, left > or right). I ran the example with my recent Python solver and got these > times in the eight cases: > > 884 s > 2.5 s > 13 s > 499 s > 5.9 s > 128 s > 1360 s > 36 s > > (That suggests a slight modification to the original strategy: solve it > in each of the eight ways "in parallel" and the worst case should be > significantly alleviated.) > > I'm actually fascinated by the Python modifications that were > conceptually insignificant but dramatically speeded up the execution > (7880 seconds to 884 seconds). That's something I'll have to keep in > mind in the future. > > > Marko > One thing I have come to rely on over the years is never, ever trust your gut instincts about Python performance, you're almost inevitably wrong. When I first came across the Norvig solver I made a change, purely for fun, to replace two calls to len() with a single call and save the result. The run time to solve each puzzle dropped by around 5%. I believe this meets your "conceptually insignificant". -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-25 13:39 +0200
Re: Sudoku solver John Ladasky <john_ladasky@sbcglobal.net> - 2015-03-25 11:44 -0700
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 13:05 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-25 21:37 +0200
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 14:09 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-25 22:31 +0200
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-26 09:40 +1100
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 18:07 -0600
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-27 20:04 +0000
Re: Sudoku solver Abhiram R <abhi.darkness@gmail.com> - 2015-03-26 08:26 +0530
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 21:24 -0600
Re: Sudoku solver Abhiram R <abhi.darkness@gmail.com> - 2015-03-26 08:58 +0530
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 14:13 +0200
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 16:15 +0200
Re: Sudoku solver albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-04-10 23:10 +0000
Re: Sudoku solver Sayth <flebber.crue@gmail.com> - 2015-03-27 20:39 -0700
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-28 23:50 +0000
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-29 11:12 +1100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 21:59 +0100
Re: Sudoku solver Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-29 22:19 +0100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 22:59 +0100
Re: Sudoku solver Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-29 14:06 +1100
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-29 15:10 +1100
Re: Sudoku solver Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-29 21:35 +1100
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-29 21:54 +1100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 13:01 +0100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 16:23 +0100
Re: Sudoku solver Christian Gollwitzer <auriocus@gmx.de> - 2015-03-29 09:57 +0200
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-30 11:54 +0100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 12:25 +0100
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-29 21:03 +0300
Re: Sudoku solver Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-29 19:26 +0100
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-29 21:33 +0300
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 22:11 +0100
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-30 00:50 -0600
Re: Sudoku solver Christian Gollwitzer <auriocus@gmx.de> - 2015-03-30 09:13 +0200
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-30 01:29 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-30 12:16 +0300
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-30 04:16 -0400
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-30 02:57 -0600
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-30 20:13 +1100
Re: Sudoku solver Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-29 22:21 +0100
Re: Sudoku solver BartC <bc@freeuk.com> - 2015-03-29 23:17 +0100
Re: Sudoku solver Seymore4Head <Seymore4Head@Hotmail.invalid> - 2015-03-29 21:40 -0400
Re: Sudoku solver Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-26 09:50 +1100
Re: Sudoku solver Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-25 23:04 +0000
Re: Sudoku solver Christian Gollwitzer <auriocus@gmx.de> - 2015-03-27 07:40 +0100
Re: Sudoku solver "Frank Millman" <frank@chagford.com> - 2015-03-26 10:19 +0200
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 14:26 +0200
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-26 23:37 +1100
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 07:15 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 16:23 +0200
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 09:06 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 17:48 +0200
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 10:20 -0600
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 18:47 +0200
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-26 10:14 -0400
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-27 01:41 +1100
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-26 11:03 -0400
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-26 17:42 +0200
Re: Sudoku solver Pete Forman <petef4+usenet@gmail.com> - 2015-03-26 22:24 +0000
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-27 02:21 +1100
Re: Sudoku solver Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-03-26 20:42 -0400
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-27 09:14 -0400
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-28 00:25 +1100
Re: Sudoku solver "Frank Millman" <frank@chagford.com> - 2015-03-27 15:35 +0200
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 15:56 +0200
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-27 10:09 -0400
Re: Sudoku solver sohcahtoa82@gmail.com - 2015-03-27 11:18 -0700
Re: Sudoku solver Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-28 12:46 +1100
Re: Sudoku solver Larry Hudson <orgnut@yahoo.com> - 2015-03-27 16:48 -0700
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-28 01:07 +1100
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-28 01:19 +1100
Re: Sudoku solver Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-03-28 14:13 +1300
Re: Sudoku solver Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-28 12:40 +1100
Re: Sudoku solver Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-28 02:24 -0600
Re: Sudoku solver Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-27 16:03 +0000
Re: Sudoku solver Virgil Stokes <vs@it.uu.se> - 2015-03-28 19:36 +0100
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-27 09:48 -0400
Re: Sudoku solver Dave Angel <davea@davea.name> - 2015-03-27 09:52 -0400
Re: Sudoku solver Chris Angelico <rosuav@gmail.com> - 2015-03-28 00:58 +1100
Re: Sudoku solver mr.smittye@gmail.com - 2015-03-29 16:39 -0700
Re: Sudoku solver Marko Rauhamaa <marko@pacujo.net> - 2015-03-30 12:24 +0300
csiph-web