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Re: Pyhon 2.x or 3.x, which is faster?

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Mark Lawrence <breamoreboy@yahoo.co.uk>
Newsgroups comp.lang.python
Subject Re: Pyhon 2.x or 3.x, which is faster?
Date Tue, 8 Mar 2016 20:44:17 +0000
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On 08/03/2016 19:15, BartC wrote:
> On 08/03/2016 16:09, Mark Lawrence wrote:
>> On 08/03/2016 11:09, BartC wrote:
>>> On 08/03/2016 02:45, Mark Lawrence wrote:
>>>> On 08/03/2016 01:47, BartC wrote:
>>>
>>>>> The Python timing for that file is around 20 seconds, time enough to
>>>>> read 10000 copies from the disk.
>>>>>
>>>>> And a C program reads /and decodes/ the same file from the same
>>>>> disk in
>>>>> between 0.1 and 0.2 seconds.
>>>>>
>>>>
>>>> So how much of that time is Python startup time, compared to C which is
>>>> effectively zero?
>>>
>>> Virtually zero as well.
>>
>> Nonsense.
>>
>>>
>>> That's if by start-up time you mean how long between invoking Python
>>> with the name of the main module, executing all the imports and defs in
>>> the main and imported modules, until it starts properly executing code.
>>>
>>> In the jpeg test, perhaps 50ms. And it would not depend on the size of
>>> the input since the start-up routines won't know that.
>>
>> How did you obtain that figure?
>
> By printing a message followed by exit(0) just before the program was
> about to start doing its thing.
>
> Then I timed that using:
>
>    $time python program.py
>
> in Linux.
>
> But this was hardly necessary as it was so obvious: it takes 150ms to
> process a 300-pixel image, 20 seconds for a 2Mpixel one, and (I have to
> switch to PyPy here as I've never had time to hang about for it) 180
> seconds for 80Mpixel file.
>
> Surely the start-up time would be the same no matter what the input.
>

Unless all of the background jobs are kicking in when you're testing.  I 
assume that you do take such factors into account, by repeating your 
tests and taking an average, or perhaps even a worst case figure.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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Thread

Pyhon 2.x or 3.x, which is faster? Tony van der Hoff <tony@vanderhoff.org> - 2016-03-06 11:34 +0000
  Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-07 01:41 +1100
    Re: Pyhon 2.x or 3.x, which is faster? Tony van der Hoff <tony@vanderhoff.org> - 2016-03-07 10:45 +0000
    Re: Pyhon 2.x or 3.x, which is faster? Andrew Jaffe <a.h.jaffe@gmail.com> - 2016-03-07 11:54 +0000
    Re: Pyhon 2.x or 3.x, which is faster? Terry Reedy <tjreedy@udel.edu> - 2016-03-07 17:33 -0500
  Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 11:02 +0000
    Re: Pyhon 2.x or 3.x, which is faster? Marko Rauhamaa <marko@pacujo.net> - 2016-03-07 13:11 +0200
      Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 11:38 +0000
        Re: Pyhon 2.x or 3.x, which is faster? Fabien <fabien.maussion@gmail.com> - 2016-03-07 13:19 +0100
          Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 13:25 +0000
            Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 02:31 +1100
              Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 18:34 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 06:10 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 20:19 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 07:47 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-07 22:39 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 10:40 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 00:22 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 00:43 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 11:45 +1100
                Re: Pyhon 2.x or 3.x, which is faster? MRAB <python@mrabarnett.plus.com> - 2016-03-08 00:47 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-03-07 20:29 -0500
                Re: Pyhon 2.x or 3.x, which is faster? Terry Reedy <tjreedy@udel.edu> - 2016-03-07 22:51 -0500
                Re: Pyhon 2.x or 3.x, which is faster? Michael Torrie <torriem@gmail.com> - 2016-03-08 17:34 -0700
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 13:01 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-09 11:38 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-08 11:05 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 01:00 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 01:12 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 01:47 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 02:45 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 11:09 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 16:09 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 19:15 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 20:44 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 22:38 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 10:59 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-09 08:40 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 12:02 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-09 21:13 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 23:14 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-09 23:35 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 00:58 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 12:28 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-10 07:30 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 11:50 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-10 12:15 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 12:47 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-11 00:08 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 14:22 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-10 19:26 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-11 16:29 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-11 18:57 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-11 21:59 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-11 22:24 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-12 16:59 +1100
                Re: Pyhon 2.x or 3.x, which is faster? alister <alister.ware@ntlworld.com> - 2016-03-12 10:06 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-12 10:31 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-12 10:51 +0000
                Re: Pyhon 2.x or 3.x, which is faster? alister <alister.ware@ntlworld.com> - 2016-03-12 15:36 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-13 14:22 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-12 10:34 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-12 21:40 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-11 07:07 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-11 16:06 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-11 16:36 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-10 13:18 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-11 00:30 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-10 13:46 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-10 18:43 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 18:55 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 12:59 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 12:19 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 10:38 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-09 23:48 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 11:03 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-10 02:38 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 14:43 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 01:30 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-10 13:29 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-10 14:32 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 13:45 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-10 11:21 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 12:23 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 01:33 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-08 12:38 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 12:40 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 02:02 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Ben Finney <ben+python@benfinney.id.au> - 2016-03-08 13:28 +1100
                Re: Pyhon 2.x or 3.x, which is faster? MRAB <python@mrabarnett.plus.com> - 2016-03-08 02:47 +0000
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 11:15 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-08 13:45 +0200
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 12:09 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Terry Reedy <tjreedy@udel.edu> - 2016-03-07 22:39 -0500
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 03:48 +0000
                What will I get when reading from a file? (was: Pyhon 2.x or 3.x, which is faster?) Ben Finney <ben+python@benfinney.id.au> - 2016-03-08 11:09 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-08 13:12 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 11:53 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 10:28 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 00:09 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-09 11:36 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-03-08 21:03 -0500
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 03:07 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Serhiy Storchaka <storchaka@gmail.com> - 2016-03-08 14:48 +0200
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-08 12:34 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-08 12:49 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Serhiy Storchaka <storchaka@gmail.com> - 2016-03-08 15:05 +0200
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-08 12:19 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 01:41 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-03-08 15:40 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 13:49 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 16:15 +0000
                Re: Pyhon 2.x or 3.x, which is faster? wxjmfauth@gmail.com - 2016-03-08 09:23 -0800
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-08 19:02 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 11:04 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 01:28 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 13:18 +1100
                Re: Pyhon 2.x or 3.x, which is faster? wxjmfauth@gmail.com - 2016-03-09 02:11 -0800
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 14:03 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 01:11 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 14:39 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 01:54 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 02:33 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 02:58 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-09 14:56 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 02:28 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 01:57 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Chris Angelico <rosuav@gmail.com> - 2016-03-10 02:04 +1100
                Re: Pyhon 2.x or 3.x, which is faster? BartC <bc@freeuk.com> - 2016-03-09 16:53 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 01:54 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-09 15:06 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Tim Golden <mail@timgolden.me.uk> - 2016-03-09 15:15 +0000
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 02:38 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Terry Reedy <tjreedy@udel.edu> - 2016-03-09 10:42 -0500
                Re: Pyhon 2.x or 3.x, which is faster? wxjmfauth@gmail.com - 2016-03-09 09:04 -0800
                Re: Pyhon 2.x or 3.x, which is faster? Marko Rauhamaa <marko@pacujo.net> - 2016-03-09 08:08 +0200
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-09 22:52 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Marko Rauhamaa <marko@pacujo.net> - 2016-03-09 14:53 +0200
                Re: Pyhon 2.x or 3.x, which is faster? Steven D'Aprano <steve@pearwood.info> - 2016-03-10 03:53 +1100
                Re: Pyhon 2.x or 3.x, which is faster? Michael Torrie <torriem@gmail.com> - 2016-03-08 17:42 -0700
        Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 02:53 +0000
    Re: Pyhon 2.x or 3.x, which is faster? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-07 19:02 +0000

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