Re: Why Python is slow

From	"Chris M. Thomasson" <invalid@invalid.invalid>
Newsgroups	comp.lang.c
Subject	Re: Why Python is slow
Date	2017-01-27 13:20 -0800
Organization	n/a
Message-ID	<o6gdf1$4uv$1@dont-email.me> (permalink)
References	(1 earlier) <o68ts6$ru2$1@dont-email.me> <o6b2uo$jb9$1@dont-email.me> <o6b6kf$1ku$1@dont-email.me> <o6b8qr$aa7$1@dont-email.me> <o6bah2$fmn$1@dont-email.me>

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On 1/25/2017 2:59 PM, BartC wrote:
> On 25/01/2017 22:30, Chris M. Thomasson wrote:
>> On 1/25/2017 1:52 PM, BartC wrote:
>>> On 25/01/2017 20:50, Chris M. Thomasson wrote:
>>>> On 1/24/2017 5:11 PM, Chris M. Thomasson wrote:
>>>
>>>>> Python is slow? Na. Its really slow, check this encryption technique
>>>>> out:
>>>>>
>>>>> http://pastebin.com/raw/QarNLfn3
>>>>
>>>> Fwiw, Python is great wrt being able to quickly mock up a quick
>>>> prototype of a "system". Imvvho, C is there to really implement that
>>>> prototype, at a lower, and faster level.
>>>>
>>>>
>>>>
>>>> Also, here is the most recent version of my Python crypto code, it goes
>>>> even slower than the original:
>>>>
>>>> http://pastebin.com/raw/Ms2wuvfq
>>>>
>>>> I need to put this up on github. lol.
>>>
>>> You haven't told us how much faster the C version is.
>>
>> IIRC, about twice as fast. The code uses a lot of slow trig functions.
>
> That's what I expected when I looked at your Python code. So there's not
> much in it really, as you can get double or half the speed just by
> switching C compilers.
>
> It's not really about Python being slower, not on this test anyway. My
> experience is that when both languages execute the /same/ algorithm,
> with the steps being in the language itself rather than buried in a
> library, then CPython can easily be 100 times slower than gcc-O3.
>

I agree with all of that. Thank you.

:^)

Thread

Why Python is slow thunderbirdmember@gmail.com - 2017-01-24 10:22 -0800
  Re: Why Python is slow Richard Heathfield <rjh@cpax.org.uk> - 2017-01-24 18:33 +0000
  Re: Why Python is slow Richard Heathfield <rjh@cpax.org.uk> - 2017-01-24 20:14 +0000
    Re: Why Python is slow luser droog <luser.droog@gmail.com> - 2017-01-26 10:13 -0800
    Re: Why Python is slow Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-30 05:50 -0800
  Re: Why Python is slow bart4858@gmail.com - 2017-01-24 13:21 -0800
  Re: Why Python is slow BartC <bc@freeuk.com> - 2017-01-24 22:23 +0000
  Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-24 17:11 -0800
    Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-24 19:26 -0800
    Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-25 12:50 -0800
      Re: Why Python is slow BartC <bc@freeuk.com> - 2017-01-25 21:52 +0000
        Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-25 14:30 -0800
          Re: Why Python is slow BartC <bc@freeuk.com> - 2017-01-25 22:59 +0000
            Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-27 13:20 -0800
      Re: Why Python is slow DFS <nospam@dfs.com> - 2017-01-25 19:22 -0500
        Re: Why Python is slow "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-01-26 13:40 -0800
  Re: Why Python is slow David Brown <david.brown@hesbynett.no> - 2017-01-25 10:29 +0100
    Re: Why Python is slow gazelle@shell.xmission.com (Kenny McCormack) - 2017-01-25 10:38 +0000
    Re: Why Python is slow Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-26 06:44 -0800
      Re: Why Python is slow Richard Heathfield <rjh@cpax.org.uk> - 2017-01-26 15:00 +0000
        Re: Why Python is slow Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 17:23 +0000
          Re: Why Python is slow supercat@casperkitty.com - 2017-01-26 09:42 -0800
            Re: Why Python is slow Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 18:24 +0000
      Re: Why Python is slow David Brown <david.brown@hesbynett.no> - 2017-01-26 16:14 +0100
        Re: Why Python is slow Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-26 12:49 -0800
          Re: Why Python is slow Robert Wessel <robertwessel2@yahoo.com> - 2017-01-26 15:11 -0600
          Re: Why Python is slow David Brown <david.brown@hesbynett.no> - 2017-01-26 23:56 +0100
        Re: Why Python is slow Keith Thompson <kst-u@mib.org> - 2017-01-26 15:20 -0800
          Re: Why Python is slow David Brown <david.brown@hesbynett.no> - 2017-01-27 09:31 +0100
      Re: Why Python is slow fir <profesor.fir@gmail.com> - 2017-01-27 07:24 -0800
        Re: Why Python is slow fir <profesor.fir@gmail.com> - 2017-01-27 07:57 -0800
          Re: Why Python is slow fir <profesor.fir@gmail.com> - 2017-01-27 08:46 -0800
        Re: Why Python is slow supercat@casperkitty.com - 2017-01-27 08:06 -0800
          Re: Why Python is slow fir <profesor.fir@gmail.com> - 2017-01-27 08:39 -0800
            Re: Why Python is slow fir <profesor.fir@gmail.com> - 2017-01-27 13:29 -0800
  Re: 3**3**3**3 Noob <root@127.0.0.1> - 2017-01-27 14:33 +0100

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