Re: faster than c

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.c
Subject	Re: faster than c
Date	2015-01-17 19:10 +0000
Organization	Aioe.org NNTP Server
Message-ID	<m9ec3g$3e6$1@speranza.aioe.org> (permalink)
References	<3f4d048e-164e-43e6-8785-87ce7646689b@googlegroups.com> <slrnmbkoug.3ps.grahn+nntp@frailea.sa.invalid> <42a7365b-a1a2-4287-a17a-270c2f168097@googlegroups.com> <66abefe5-b011-4784-8753-618db4c51326@googlegroups.com>

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wssimms@gmail.com wrote:

(snip regarding C++ being faster than C)

>> However C++ makes it more tempting to use inefficient data 
>> representations,
>> and do unnecessary copying and dynamic memory allocation, also run
>> unnecessary bounds checking. It much harder to keep track of how
>> many cycles you are using, because C++ does more work without being
>> explicitly told.

> There isn't anything inherent in C++ that would make it faster than
> C, at least as far as the base language goes. But C++ has a very large
> and useful standard library that can be highly optimized for each
> platform, and C++ strongly encourages the use of this library.

And if you are lucky that your program exactly matches one of those
libraries, then yes.

> Unless you are talking about embedded systems programming (and
> even then with modern "big" embedded systems, it may well be faster
> to use C++'s built in libraries than to roll your own in C. 

Well, even for non-embedded systems, the libraries you indicate have
to allow for a more general case than one usually needs. That adds
extra overhead relative to the more specific case.  But well optimized
code might make up for some more specific, but less optimized code.

> Sure you can
> license third party libraries in C to cover some of the gap, and of course
> everybody probably has their own personal libraries, but neither of these
> are likely to be as optimized, both algorithmically and in a machine-
> dependent sense, as the standard libraries in a good C++ implementation.

The personal library might be better matched to the problem, though,
as the person will have written it for the problems in need. 

One then has to balance the extra cost (time) for the optimal routine
against the faster (in people time) of the more general choice.

-- glen

Thread

faster than c fir <profesor.fir@gmail.com> - 2015-01-10 13:11 -0800
  Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-10 14:26 -0800
    Re: faster than c Chad <cdalten@gmail.com> - 2015-01-10 14:43 -0800
      Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-10 15:20 -0800
    Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-10 15:39 -0800
    Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-11 09:23 +0000
      Re: faster than c asetofsymbols@gmail.com - 2015-01-11 02:17 -0800
      Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-11 06:00 -0800
      Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-12 06:46 -0800
        Re: faster than c Morris Dovey <mrdovey@iedu.com> - 2015-01-12 15:01 -0600
          Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-12 13:44 -0800
            Re: faster than c Morris Dovey <mrdovey@iedu.com> - 2015-01-12 16:59 -0600
              Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-12 15:25 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-13 04:56 -0800
        Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-12 23:26 +0000
          Re: faster than c jt@toerring.de (Jens Thoms Toerring) - 2015-01-13 01:10 +0000
          Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-13 05:16 -0800
  faster than c Chad <cdalten@gmail.com> - 2015-01-10 14:42 -0800
  Re: faster than c Cooler_x0a <c00f3r@gmail.com> - 2015-01-10 15:51 -0800
  Re: faster than c Geoff <geoff@invalid.invalid> - 2015-01-11 00:21 -0800
    Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-11 02:27 -0800
      Re: faster than c gamo <gamo@telecable.es> - 2015-01-11 12:17 +0100
    Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-11 21:02 +0100
    Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-21 03:44 -0800
      Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-21 05:08 -0800
      Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-21 13:53 +0000
        Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-21 06:03 -0800
          Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-22 15:06 +0100
            Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-22 06:57 -0800
              Re: faster than c mark.bluemel@gmail.com - 2015-01-22 07:27 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-22 07:36 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-22 07:45 -0800
            Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-24 22:36 -0700
  Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-11 21:16 +0100
  Re: faster than c Tim Prince <tprince@computer.org> - 2015-01-11 15:42 -0500
  Re: faster than c Michael Angelo Ravera <maravera@prodigy.net> - 2015-01-14 12:25 -0800
  Re: faster than c Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-01-17 13:29 +0000
    Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 05:32 -0800
    Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-17 14:42 +0100
      Re: faster than c Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-01-17 19:29 +0000
        Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 11:55 -0800
    Re: faster than c "Osmium" <r124c4u102@comcast.net> - 2015-01-17 08:00 -0600
    Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-17 10:15 -0800
      Re: faster than c wssimms@gmail.com - 2015-01-17 10:31 -0800
        Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-17 19:10 +0000
          Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 11:21 -0800
        Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 11:13 -0800
        Re: faster than c Öö Tiib <ootiib@hot.ee> - 2015-01-17 12:32 -0800
          Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 11:01 +0100
            Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-01-19 08:24 -0800
              Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 22:52 +0100
              Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-20 00:04 -0600
            Re: faster than c Öö Tiib <ootiib@hot.ee> - 2015-01-19 10:12 -0800
              Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 23:05 +0100
                Re: faster than c Öö Tiib <ootiib@hot.ee> - 2015-01-19 16:23 -0800
            Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-24 09:32 -0700
              Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-03-24 19:08 +0100
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-25 12:31 -0700
                Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-25 12:45 -0700
                Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-03-25 12:58 -0700
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-03-25 21:22 +0100
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-25 16:30 -0700
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-03-26 00:50 +0100
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-28 09:20 -0700
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-03-26 00:55 +0100
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-03-26 01:06 +0100
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-03-26 11:34 +0100
                Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-03-25 20:29 -0700
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-25 16:34 -0700
                Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-03-26 13:53 +1300
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-28 15:08 -0700
                Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-03-29 11:28 +1300
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-30 12:42 -0700
                Re: faster than c Kaz Kylheku <kaz@kylheku.com> - 2015-03-30 20:06 +0000
                Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-03-31 16:37 +1300
                Re: faster than c Kaz Kylheku <kaz@kylheku.com> - 2015-03-31 05:13 +0000
                Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-03-31 16:33 +1300
                Re: faster than c Philip Lantz <prl@canterey.us> - 2015-03-31 00:14 -0700
      Re: faster than c wssimms@gmail.com - 2015-01-17 10:33 -0800
        Re: faster than c Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-17 20:03 +0000
          Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 11:07 +0100
          Re: faster than c wpihughes@gmail.com - 2015-01-26 13:30 -0800
      Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-01-18 16:36 +1300
    Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-17 19:02 +0000
      Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 19:14 +0000
        Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 11:41 -0800
          Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 12:06 -0800
            Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 20:36 +0000
              Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 13:01 -0800
                Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 21:18 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 13:36 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 11:17 +0100
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-19 10:40 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 03:29 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 03:41 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 12:45 +0100
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 04:00 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 04:31 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 04:48 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-19 15:23 +0100
                Re: faster than c mark.bluemel@gmail.com - 2015-01-19 07:25 -0800
                Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-19 08:56 -0800
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-19 17:01 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 09:08 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 09:19 -0800
                Re: faster than c Bartc <bc@freeuk.com> - 2015-01-19 17:46 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 10:19 -0800
                Re: faster than c Geoff <geoff@invalid.invalid> - 2015-01-19 10:56 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 11:30 -0800
                Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-01-19 14:22 -0800
                Re: faster than c mark.bluemel@gmail.com - 2015-01-20 00:45 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-20 01:20 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 08:25 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-20 00:57 -0800
                Re: faster than c fmassei@gmail.com - 2015-01-19 03:58 -0800
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-20 00:05 -0600
                Re: faster than c fmassei@gmail.com - 2015-01-20 02:11 -0800
                Re: faster than c asetofsymbols@gmail.com - 2015-01-20 02:18 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-20 02:30 -0800
                Re: faster than c asetofsymbols@gmail.com - 2015-01-20 05:16 -0800
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-20 14:18 +0100
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-20 15:29 -0600
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-20 21:53 +0000
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-20 17:37 -0600
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-21 00:05 +0000
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-21 01:38 -0600
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-21 07:46 +0000
                Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-21 03:23 -0800
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-21 13:52 +0000
                Re: faster than c Morris Dovey <mrdovey@iedu.com> - 2015-01-21 08:53 -0600
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-21 01:18 +0100
                Re: faster than c fmassei@gmail.com - 2015-01-20 16:41 -0800
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-21 01:58 +0100
                Re: faster than c fmassei@gmail.com - 2015-01-20 17:11 -0800
                Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-21 02:18 +0100
                Re: faster than c fmassei@gmail.com - 2015-01-20 17:38 -0800
                Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-01-21 08:48 -0800
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-20 15:24 -0600
                Re: faster than c fmassei@gmail.com - 2015-01-20 13:38 -0800
                Re: faster than c Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-21 16:43 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-21 10:09 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-24 01:15 -0800
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-21 23:59 -0600
                Re: faster than c fmassei@gmail.com - 2015-01-22 01:17 -0800
                Re: faster than c wssimms@gmail.com - 2015-01-22 05:16 -0800
                Re: faster than c fmassei@gmail.com - 2015-01-22 05:27 -0800
                Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-22 05:36 -0800
                Re: faster than c fmassei@gmail.com - 2015-01-22 05:54 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-22 05:55 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-22 15:18 +0100
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-01-23 00:53 -0600
                Re: faster than c fmassei@gmail.com - 2015-01-23 00:36 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-23 01:09 -0800
                Re: faster than c fmassei@gmail.com - 2015-01-23 01:33 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-23 01:55 -0800
                Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-01-23 22:44 +1300
                Re: faster than c fmassei@gmail.com - 2015-01-23 01:56 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-22 15:11 +0100
                Re: faster than c fmassei@gmail.com - 2015-01-22 06:21 -0800
                Re: faster than c David Brown <david.brown@hesbynett.no> - 2015-01-22 16:46 +0100
                Re: faster than c fmassei@gmail.com - 2015-01-22 07:58 -0800
                Re: faster than c Lowell Gilbert <lgusenet@be-well.ilk.org> - 2015-01-22 12:29 -0500
                Re: faster than c fmassei@gmail.com - 2015-01-22 10:09 -0800
                Re: faster than c "Chris M. Thomasson" <no@spam.invalid> - 2015-01-22 14:07 -0800
                Re: faster than c asetofsymbols@gmail.com - 2015-01-24 00:40 -0800
                Re: faster than c "Chris M. Thomasson" <no@spam.invalid> - 2015-01-24 12:53 -0800
                Re: faster than c Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-22 15:09 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-22 01:59 -0800
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-24 09:46 -0700
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-03-25 02:15 -0500
                Re: faster than c asetofsymbols@gmail.com - 2015-03-25 02:45 -0700
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-25 11:30 -0700
                Re: faster than c Robert Wessel <robertwessel2@yahoo.com> - 2015-03-26 00:42 -0500
                Re: faster than c Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-28 11:35 -0700
                Re: faster than c Keith Thompson <kst-u@mib.org> - 2015-01-17 14:42 -0800
                Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 22:53 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 15:13 -0800
        Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-17 22:02 +0000
        Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-17 16:21 -0800
          Re: faster than c BartC <bc@freeuk.com> - 2015-01-18 01:27 +0000
            Re: faster than c glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-18 01:41 +0000
            Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-18 00:11 -0800
              Re: faster than c BartC <bc@freeuk.com> - 2015-01-18 11:23 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-18 05:55 -0800
                Re: faster than c BartC <bc@freeuk.com> - 2015-01-18 20:11 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-18 13:12 -0800
                Re: faster than c BartC <bc@freeuk.com> - 2015-01-18 23:11 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-18 15:49 -0800
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-18 16:06 -0800
                Re: faster than c Bartc <bc@freeuk.com> - 2015-01-19 01:03 +0000
                Re: faster than c Richard Heathfield <invalid@see.sig.invalid> - 2015-01-19 08:13 +0000
                Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-19 01:39 -0800
                Re: faster than c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-18 13:52 -0800
                Re: faster than c BartC <bc@freeuk.com> - 2015-01-18 23:36 +0000
      Re: faster than c Walter Banks <walter@bytecraft.com> - 2015-01-20 14:01 -0500
        Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-20 11:18 -0800
    Re: faster than c Melzzzzz <mel@zzzzz.com> - 2015-01-17 22:30 +0100
    Re: faster than c Ian Collins <ian-news@hotmail.com> - 2015-01-18 16:49 +1300
  Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 05:55 -0800
    Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 14:30 +0000
      Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 07:32 -0800
        Re: faster than c BartC <bc@freeuk.com> - 2015-01-17 15:56 +0000
          Re: faster than c fir <profesor.fir@gmail.com> - 2015-01-17 08:33 -0800
  Re: faster than c fmassei@gmail.com - 2015-01-19 02:26 -0800
  faster than c asetofsymbols@gmail.com - 2015-01-20 00:12 -0800

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