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Re: stdcbench benchmark

From Ian Collins <ian-news@hotmail.com>
Newsgroups comp.lang.c
Subject Re: stdcbench benchmark
Date 2018-04-17 08:04 +1200
Message-ID <fjkdueFc8hgU1@mid.individual.net> (permalink)
References (11 earlier) <PC2BC.15349$k%2.551@fx19.iad> <xQ2BC.1239493$lm7.563039@fx12.am4> <8w3BC.5780$yK2.5645@fx16.iad> <pM3BC.340217$5S1.232759@fx27.am4> <_U3BC.5782$yK2.878@fx16.iad>

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On 04/17/2018 04:09 AM, Scott Lurndal wrote:
> bartc <bc@freeuk.com> writes:
>> On 16/04/2018 16:43, Scott Lurndal wrote:
>>> bartc <bc@freeuk.com> writes:
>>>> On 16/04/2018 15:41, Scott Lurndal wrote:
>>
>>>>> Indeed.   The application I'm currently working on has between 6
>>>>> and 96 threads running flat-out, 100%.   No I/O.  Might block
>>>>> infrequently waiting for a mutex, very infrequently, the threads
>>>>> are pretty much independent.   Every cycle matters, so
>>>>> work goes into looking at L1/L2 cache behavior, data layout wrt
>>>>> cache-lines, compiler optimzations, and inline micro-optimizations
>>>>> (e.g. avoiding blocking operations like mutexes when possible by using
>>>>> atomics instead)
>>>>>
>>>>
>>>> How much difference would it make if you left all that in place, but
>>>> switched off compiler optimisations?
>>>
>>> It runs 20 to 40 times slower.
>>>
>>
>> Really? It has the same effect as switching to an interpreted language?
>>
>> Then your programs must be highly atypical.
> 
> I wouldn't say that at all.  Say instead that the optimizer is pretty
> good.   Note also that disabling optimization with gcc will prevent
> function in-lining, which I suspect makes a large part of the
> difference in performance.

Yours is at the extreme end of the scale, probably because you have 
managed to keep caches full and cores running flat out.  Most software 
wastes CPU cycles stalling or blocking, so optimisations don't play such 
a dominant role in the overall performance.

-- 
Ian.

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Thread

stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-15 10:38 +0200
  Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-15 02:31 -0700
  Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-15 13:42 +0100
    Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-15 18:00 +0100
      Re: stdcbench benchmark Melzzzzz <Melzzzzz@zzzzz.com> - 2018-04-15 18:11 +0000
        Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-15 19:30 +0100
          Re: stdcbench benchmark Melzzzzz <Melzzzzz@zzzzz.com> - 2018-04-15 18:52 +0000
        Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-15 20:15 -0700
  Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-15 20:42 +0100
    Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-15 22:31 +0200
      Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-15 23:29 +0100
        Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-16 07:48 +0200
          Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-15 23:22 -0700
          Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-16 11:52 +0200
        Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-16 09:56 +0200
          Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-16 01:58 -0700
        Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 10:08 +0200
          Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 11:37 +0100
            Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-16 22:42 +1200
            Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 12:54 +0200
              Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 13:02 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 14:39 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 14:53 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 16:32 +0200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 14:41 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 15:56 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 17:21 +0200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 15:43 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 17:00 +0100
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 16:09 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 17:22 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 09:35 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 11:42 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 14:14 +0200
                Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-17 15:49 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 18:45 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 23:00 +0200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-17 21:18 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 23:20 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 09:27 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 11:30 +0100
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-18 03:43 -0700
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-18 22:58 +1200
                Re: stdcbench benchmark mark.bluemel@gmail.com - 2018-04-18 04:01 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 12:39 +0100
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-18 06:52 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 13:59 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 06:14 -0700
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-19 07:39 +1200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 06:14 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 16:31 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 08:00 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 17:26 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 08:37 -0700
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-18 16:12 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 18:15 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 04:01 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 13:01 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 04:15 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 13:41 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-18 05:35 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 12:26 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 13:58 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 22:29 +0100
                Re: stdcbench benchmark Keith Thompson <kst-u@mib.org> - 2018-04-18 10:34 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 22:34 +0200
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 22:35 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-19 20:05 +0100
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-20 08:07 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-19 23:34 +0100
                Re: stdcbench benchmark Keith Thompson <kst-u@mib.org> - 2018-04-19 16:05 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 00:18 +0100
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-25 23:12 +0000
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-20 16:15 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 11:39 +0100
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-20 23:46 +1200
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-20 05:04 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 13:27 +0100
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-20 06:06 -0700
                Re: stdcbench benchmark supercat@casperkitty.com - 2018-04-20 13:05 -0700
                Re: stdcbench benchmark mark.bluemel@gmail.com - 2018-04-20 01:23 -0700
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-20 01:40 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 12:04 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-20 04:16 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 13:48 +0100
                Re: stdcbench benchmark Tim Rentsch <txr@alumni.caltech.edu> - 2018-04-23 11:53 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-23 20:33 +0100
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-26 01:00 -0700
                Re: stdcbench benchmark Keith Thompson <kst-u@mib.org> - 2018-04-20 09:17 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 19:25 +0100
                Re: stdcbench benchmark Keith Thompson <kst-u@mib.org> - 2018-04-20 11:58 -0700
                Re: stdcbench benchmark supercat@casperkitty.com - 2018-04-20 12:30 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 21:03 +0100
                Re: stdcbench benchmark Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-04-20 22:16 +0100
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 23:09 +0100
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 14:42 +0100
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-20 09:30 -0700
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-21 07:24 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 20:43 +0100
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-21 07:59 +1200
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-21 08:01 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 21:18 +0100
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-21 09:17 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-20 23:15 +0100
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 02:14 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 09:54 +0200
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-18 01:21 -0700
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 11:40 +0100
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-18 11:26 +1200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-18 01:48 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-18 09:58 +0200
                Re: stdcbench benchmark Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-04-16 16:45 +0000
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 17:31 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 18:53 +0100
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 17:55 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 19:01 +0100
                Re: stdcbench benchmark Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-04-16 20:28 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-16 21:57 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 09:45 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 12:24 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 14:31 +0200
                Re: stdcbench benchmark Robert Wessel <robertwessel2@yahoo.com> - 2018-04-16 16:59 -0500
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 01:02 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 09:47 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 13:16 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 14:38 +0200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-17 13:18 +0000
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 14:37 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 06:44 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 15:58 +0200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-17 15:43 +0000
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-17 08:47 -0700
                Re: stdcbench benchmark Ian Collins <ian-news@hotmail.com> - 2018-04-17 08:04 +1200
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 20:30 +0000
                Re: stdcbench benchmark Melzzzzz <Melzzzzz@zzzzz.com> - 2018-04-16 16:31 +0000
                Re: stdcbench benchmark Keith Thompson <kst-u@mib.org> - 2018-04-20 14:22 -0700
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-17 00:42 -0700
              Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-16 07:00 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-16 16:35 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-16 09:28 -0700
                Re: stdcbench benchmark scott@slp53.sl.home (Scott Lurndal) - 2018-04-16 17:42 +0000
                Re: stdcbench benchmark Robert Wessel <robertwessel2@yahoo.com> - 2018-04-16 17:07 -0500
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 02:50 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 12:42 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 11:58 +0100
                Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-17 14:01 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 13:40 +0100
                Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-17 15:41 +0200
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 14:46 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 06:09 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 16:07 +0200
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 14:43 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 15:26 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 07:42 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 16:51 +0200
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 08:07 -0700
                Re: stdcbench benchmark Steven Petruzzellis <frelwizzen@gmail.com> - 2018-04-17 08:16 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 23:17 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 17:12 +0100
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 23:26 +0200
                Re: stdcbench benchmark bartc <bc@freeuk.com> - 2018-04-17 23:38 +0100
                Re: stdcbench benchmark Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2018-04-17 05:52 -0700
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 16:10 +0200
                Re: stdcbench benchmark David Brown <david.brown@hesbynett.no> - 2018-04-17 10:02 +0200
    Re: stdcbench benchmark Philipp Klaus Krause <pkk@spth.de> - 2018-04-15 23:20 +0200

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