Date: Fri, 15 Dec 2006 06:05:32 -0800 From: Luigi Rizzo <rizzo@icir.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-current@freebsd.org, Steve Kargl <sgk@troutmask.apl.washington.edu>, Stefan Ehmann <shoesoft@gmx.net> Subject: Re: Let's use gcc-4.2, not 4.1 -- OpenMP Message-ID: <20061215060531.B65183@xorpc.icir.org> In-Reply-To: <23331.1166189988@critter.freebsd.dk>; from phk@phk.freebsd.dk on Fri, Dec 15, 2006 at 01:39:48PM %2B0000 References: <200612151250.10033.shoesoft@gmx.net> <23331.1166189988@critter.freebsd.dk>
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On Fri, Dec 15, 2006 at 01:39:48PM +0000, Poul-Henning Kamp wrote: > In message <200612151250.10033.shoesoft@gmx.net>, Stefan Ehmann writes: > > >Settings/Compiler | gcc-3.4 | gcc-4.1 | gcc-4.2 > >----------------------------+---------+---------+--------- > >-O2 | 13.1bn | 13.8bn | 13.5bn > >-O2 -funroll-loops | 9.6bn | 9.3bn | 9.2bn > >-O2 -march=athlon-xp -fun.. | 9.7bn | 10.6bn | 10.7bn > >-O3 | 11.5bn | 9.5bn | 9.6bn > >-O3 -funroll-loops | 8.4bn | 9.2bn | 9.4bn > >-O3 -march=athlon-xp -fun.. | 8.8bn | 10.6bn | 11.1bn > > I love benchmarks. > > It's great when people benchmark things. > > Unfortunately, that is not what you have done, because you have > not indicated what the standard deviation on your numbers are, > so they are totally worthless. in general, you are totally right. but note that in this specific case, these seem to be the numbers of retired instructions, not cycles or times. So they should be rather deterministic (apart from background noise due to races in getting locks, interfering kernel activity etc. - which in truth the SD would help characterising :) cheers luigi > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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