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Re: Speed Test for Comparison

From Ben Pfaff <blp@cs.stanford.edu>
Newsgroups comp.lang.c
Subject Re: Speed Test for Comparison
Date 2011-12-08 12:49 -0800
Message-ID <87vcpqvlez.fsf@blp.benpfaff.org> (permalink)
References <9kc99pFurU1@mid.individual.net> <e132e7phmeufduaa2301bi706vf4iss9m9@4ax.com> <9kck2pFoa2U1@mid.individual.net> <9kckciFqinU1@mid.individual.net> <slrnje286j.6j9.usenet-nospam@guild.seebs.net>

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Seebs <usenet-nospam@seebs.net> writes:

> On 2011-12-08, Mel Smith <med_cutout_syntel@aol.com> wrote:
>>     an Intel(R) Core(TM) 2 CPU
>>     4300 @ 1.80 GHz with 1.99GB of Ram
>
> You haven't specified the specs of the RAM -- not just speed, but CAS
> timings, for instance.  Doesn't matter as much with a Core 2, but with
> newer CPUs it might also matter how much cooling you have, as they'll
> overclock themselves if there's extra bandwidth.

I can't see how microbenchmarks that, e.g., measure the speed of
assignment to a local variable would depend much on the size of
RAM.  They probably run entirely in-cache.  If they don't, then
the language implementation is a hopeless pig.
-- 
Ben Pfaff 
http://benpfaff.org

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Thread

Speed Test for Comparison "Mel Smith" <med_cutout_syntel@aol.com> - 2011-12-08 10:09 -0700
  Re: Speed Test for Comparison Richard Sanders <lnr729@gmail.com> - 2011-12-08 11:19 -0800
    Re: Speed Test for Comparison "Mel Smith" <med_cutout_syntel@aol.com> - 2011-12-08 13:13 -0700
      Re: Speed Test for Comparison "Mel Smith" <med_cutout_syntel@aol.com> - 2011-12-08 13:18 -0700
        Re: Speed Test for Comparison Seebs <usenet-nospam@seebs.net> - 2011-12-08 20:41 +0000
          Re: Speed Test for Comparison Ben Pfaff <blp@cs.stanford.edu> - 2011-12-08 12:49 -0800
            Re: Speed Test for Comparison Seebs <usenet-nospam@seebs.net> - 2011-12-08 21:53 +0000
      Re: Speed Test for Comparison Seebs <usenet-nospam@seebs.net> - 2011-12-08 20:41 +0000
  Re: Speed Test for Comparison "BartC" <bc@freeuk.com> - 2011-12-08 21:43 +0000
  Re: Speed Test for Comparison ImpalerCore <jadill33@gmail.com> - 2011-12-08 13:58 -0800
  Re: Speed Test for Comparison Keith Thompson <kst-u@mib.org> - 2011-12-08 14:58 -0800
    Re: Speed Test for Comparison "Mel Smith" <med_cutout_syntel@aol.com> - 2011-12-10 11:28 -0700
      Re: Speed Test for Comparison "BartC" <bc@freeuk.com> - 2011-12-10 21:40 +0000
        Re: Speed Test for Comparison "Mel Smith" <med_cutout_syntel@aol.com> - 2011-12-10 19:26 -0700
      Re: Speed Test for Comparison Keith Thompson <kst-u@mib.org> - 2011-12-10 13:49 -0800

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