From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: Ingo Molnar <mingo@elte.hu>, Jonathan Nieder <jrnieder@gmail.com>,
Duy Nguyen <pclouds@gmail.com>,
Git Mailing List <git@vger.kernel.org>
Subject: Re: Make GIT_USE_LOOKUP default?
Date: Mon, 18 Mar 2013 12:49:50 -0400 [thread overview]
Message-ID: <20130318164950.GA14844@sigill.intra.peff.net> (raw)
In-Reply-To: <7vtxo8ody3.fsf@alter.siamese.dyndns.org>
On Mon, Mar 18, 2013 at 09:44:20AM -0700, Junio C Hamano wrote:
> FWIW, I am getting something like this on my
>
> $ grep 'model name' /proc/cpuinfo | uniq -c
> 4 model name : Intel(R) Core(TM)2 Quad CPU Q9450 @ 2.66GHz
>
> The same "rev-list --objects --all >/dev/null", best of five:
>
> [current master, compiled with -O2]
> real 0m39.956s
> user 0m39.562s
> sys 0m0.396s
>
> [revert 1a812f3 (i.e., go back to memcmp), -O2]
> real 0m42.161s
> user 0m41.879s
> sys 0m0.284s
>
> It could be that the difference may be how well memcmp() is
> optimized, no? My box runs Debian with libc6 2.11.3-4 and gcc
> 4.4.5.
Yeah, that would make sense. I have libc6 2.13-38 and gcc 4.7.2 (debian
unstable).
-Peff
next prev parent reply other threads:[~2013-03-18 16:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-17 13:25 Make GIT_USE_LOOKUP default? Duy Nguyen
2013-03-17 20:13 ` Junio C Hamano
2013-03-18 7:32 ` Jeff King
2013-03-18 16:44 ` Junio C Hamano
2013-03-18 16:49 ` Jeff King [this message]
2013-03-18 17:08 ` Junio C Hamano
2013-03-18 17:19 ` Jeff King
2013-03-18 18:40 ` Junio C Hamano
2013-03-19 15:43 ` Duy Nguyen
2013-03-19 15:55 ` Jeff King
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