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| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Subject | Re: Assignment Versus Equality |
| Date | Wed, 29 Jun 2016 18:09:42 +1000 |
| Lines | 110 |
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On Wed, Jun 29, 2016 at 4:45 PM, Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote: > On Wednesday 29 June 2016 15:51, Lawrence D’Oliveiro wrote: > >> On Wednesday, June 29, 2016 at 5:26:46 PM UTC+12, Steven D'Aprano wrote: >>> BUT in Python 3, the distinction between int and long is gone by dropping >>> int and renaming long as "int". So all Python ints are BIGNUMs. >> >> I don’t understand what the problem is with this. Is there supposed to be >> some issue with performance? Because I can’t see it. > > If there is a performance hit, it's probably pretty small. It may have been > bigger back in Python 3.0 or 3.1. > > [steve@ando ~]$ python2.7 -m timeit -s "n = 0" "for i in xrange(10000): n += i" > 100 loops, best of 3: 1.87 msec per loop > > [steve@ando ~]$ python3.3 -m timeit -s "n = 0" "for i in range(10000): n += i" > 1000 loops, best of 3: 1.89 msec per loop > > > Although setting debugging options does make it pretty slow: > > [steve@ando ~]$ python/python-dev/3.6/python -m timeit -s "n = 0" "for i in > range(10000): n += i" > 100 loops, best of 3: 13.7 msec per loop That's not necessarily fair - you're comparing two quite different Python interpreters, so there might be something entirely different that counteracts the integer performance. (For example: You're creating and disposing of large numbers of objects, so the performance of object creation could affect things hugely.) To make it somewhat fairer, add long integer performance to the mix. Starting by redoing your test: rosuav@sikorsky:~$ python2.7 -m timeit -s "n = 0" "for i in xrange(10000): n += i" 10000 loops, best of 3: 192 usec per loop rosuav@sikorsky:~$ python2.7 -m timeit -s "n = 1<<100" "for i in xrange(10000): n += i" 1000 loops, best of 3: 478 usec per loop rosuav@sikorsky:~$ python3.4 -m timeit -s "n = 0" "for i in range(10000): n += i" 1000 loops, best of 3: 328 usec per loop rosuav@sikorsky:~$ python3.4 -m timeit -s "n = 1<<100" "for i in range(10000): n += i" 1000 loops, best of 3: 337 usec per loop rosuav@sikorsky:~$ python3.5 -m timeit -s "n = 0" "for i in range(10000): n += i" 1000 loops, best of 3: 369 usec per loop rosuav@sikorsky:~$ python3.5 -m timeit -s "n = 1<<100" "for i in range(10000): n += i" 1000 loops, best of 3: 356 usec per loop rosuav@sikorsky:~$ python3.6 -m timeit -s "n = 0" "for i in range(10000): n += i" 1000 loops, best of 3: 339 usec per loop rosuav@sikorsky:~$ python3.6 -m timeit -s "n = 1<<100" "for i in range(10000): n += i" 1000 loops, best of 3: 343 usec per loop (On this system, python3.4 and python3.5 are Debian-shipped builds of CPython, and python3.6 is one I compiled from hg today. There's no visible variance between them, but just in case. I don't have a python3.3 on here for a fair comparison with your numbers, sorry.) The way I read this, Python 2.7 is noticeably slower with bignums, but visibly faster with machine words. Python 3, on the other hand, has consistent performance whether the numbers fit within a machine word or not - which is to be expected, since it uses bignums for all integers. PyPy's performance shows an even more dramatic gap: rosuav@sikorsky:~$ pypy -m timeit -s "n = 0" "for i in xrange(10000): n += i" 100000 loops, best of 3: 7.59 usec per loop rosuav@sikorsky:~$ pypy -m timeit -s "n = 1<<100" "for i in xrange(10000): n += i" 10000 loops, best of 3: 119 usec per loop rosuav@sikorsky:~$ pypy --version Python 2.7.10 (5.1.2+dfsg-1, May 17 2016, 18:03:30) [PyPy 5.1.2 with GCC 5.3.1 20160509] Sadly, Debian doesn't ship a pypy3 yet, so for consistency, I picked up the latest available pypy2 and pypy3 from pypy.org. rosuav@sikorsky:~/tmp$ pypy2-v5.3.1-linux64/bin/pypy -m timeit -s "n = 0" "for i in xrange(10000): n += i" 100000 loops, best of 3: 7.58 usec per loop rosuav@sikorsky:~/tmp$ pypy2-v5.3.1-linux64/bin/pypy -m timeit -s "n = 1<<100" "for i in xrange(10000): n += i" 10000 loops, best of 3: 115 usec per loop rosuav@sikorsky:~/tmp$ pypy3.3-v5.2.0-alpha1-linux64/bin/pypy3 -m timeit -s "n = 0" "for i in range(10000): n += i" 100000 loops, best of 3: 7.56 usec per loop rosuav@sikorsky:~/tmp$ pypy3.3-v5.2.0-alpha1-linux64/bin/pypy3 -m timeit -s "n = 1<<100" "for i in range(10000): n += i" 10000 loops, best of 3: 115 usec per loop Performance comparable to each other (and to the Debian-shipped one, which is nice - as Adam Savage said, I love consistent data!), and drastically different between machine words and bignums. So it looks like PyPy *does* have some sort of optimization going on here, without ever violating the language spec. ChrisA
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Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-26 00:36 -0700
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-26 11:48 +0100
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-26 23:21 +1000
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-26 07:26 -0700
Re: Assignment Versus Equality Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-26 11:31 -0400
Re: Assignment Versus Equality Christopher Reimer <christopher_reimer@icloud.com> - 2016-06-26 11:47 -0700
Re: Assignment Versus Equality Michael Torrie <torriem@gmail.com> - 2016-06-26 15:28 -0600
Re: Assignment Versus Equality Bob Gailer <bgailer@gmail.com> - 2016-06-27 08:22 -0400
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 05:48 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-27 23:28 +1000
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-27 16:58 +0300
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 07:23 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-28 11:05 +1000
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 21:31 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-28 15:42 +1000
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-28 16:04 +1000
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-28 09:12 +0300
Re: Assignment Versus Equality Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-28 11:04 +0300
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 23:09 -0700
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 00:12 -0700
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-28 17:26 +1000
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 01:49 -0700
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-28 20:34 +1000
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 17:42 -0700
Re: Assignment Versus Equality Random832 <random832@fastmail.com> - 2016-06-28 10:13 -0400
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-28 19:39 +0300
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-28 19:41 +0300
Re: Assignment Versus Equality Random832 <random832@fastmail.com> - 2016-06-28 13:19 -0400
Re: Assignment Versus Equality Ian Kelly <ian.g.kelly@gmail.com> - 2016-06-28 12:27 -0600
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-28 22:40 +0300
Re: Assignment Versus Equality Gene Heskett <gheskett@shentel.net> - 2016-06-28 16:59 -0400
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-30 12:29 +1200
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-30 12:50 +1000
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-30 09:22 +0300
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-29 12:27 +1000
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-28 20:52 -0700
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-28 21:03 -0700
Re: Assignment Versus Equality Random832 <random832@fastmail.com> - 2016-06-29 00:52 -0400
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-27 18:14 -0700
Re: Assignment Versus Equality Gene Heskett <gheskett@shentel.net> - 2016-06-27 11:21 -0400
Re: Assignment Versus Equality Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-27 20:04 -0400
Re: Assignment Versus Equality Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-26 11:21 -0400
Re: Assignment Versus Equality Cousin Stanley <HooDunnit@didly42KahZidly.net> - 2016-06-26 08:47 -0700
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-26 16:56 +0100
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-27 11:38 +1200
Re: Assignment Versus Equality Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-27 07:30 -0400
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-28 18:17 +1200
Re: Assignment Versus Equality Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-27 13:59 +0000
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-27 17:09 +0300
Re: Assignment Versus Equality sohcahtoa82@gmail.com - 2016-06-27 17:33 -0700
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-28 07:25 +0300
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 23:54 -0700
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 07:10 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-29 12:35 +1000
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 14:19 +1000
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 21:51 -0700
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 15:07 +1000
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-28 22:55 -0700
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 16:26 +1000
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-28 23:33 -0700
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-28 23:37 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-29 15:26 +1000
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 22:51 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-29 16:45 +1000
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-29 01:07 -0700
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 18:09 +1000
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-29 22:36 +1000
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-29 14:24 +0100
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 23:35 +1000
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-29 15:47 +0100
Re: Assignment Versus Equality Chris Angelico <rosuav@gmail.com> - 2016-06-29 23:34 +1000
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-29 10:49 +0100
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-29 02:56 -0700
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-29 11:10 +0100
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-29 03:24 -0700
Re: Assignment Versus Equality Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2016-06-27 16:48 +0200
Re: Assignment Versus Equality Rustom Mody <rustompmody@gmail.com> - 2016-06-27 22:00 -0700
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-28 11:34 +1000
Re: Assignment Versus Equality MRAB <python@mrabarnett.plus.com> - 2016-06-27 16:27 +0100
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-27 14:56 -0700
Re: Assignment Versus Equality Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-27 15:45 -0700
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-28 00:08 +0100
Re: Assignment Versus Equality Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-27 20:11 -0400
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-28 11:35 +0100
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-28 18:59 +1200
Re: Assignment Versus Equality Steven D'Aprano <steve@pearwood.info> - 2016-06-28 11:28 +1000
Re: Assignment Versus Equality Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-27 15:42 +0000
Re: Assignment Versus Equality Marko Rauhamaa <marko@pacujo.net> - 2016-06-26 19:11 +0300
Re: Assignment Versus Equality MRAB <python@mrabarnett.plus.com> - 2016-06-26 16:41 +0100
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-26 17:08 +0100
Re: Assignment Versus Equality Christopher Reimer <christopher_reimer@icloud.com> - 2016-06-26 11:53 -0700
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-27 11:41 +1200
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-27 11:22 +1200
Re: Assignment Versus Equality BartC <bc@freeuk.com> - 2016-06-27 00:39 +0100
Re: Assignment Versus Equality Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-28 18:15 +1200
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