From: Jeff King <peff@peff.net>
Date: Mon, 18 Mar 2013 16:49:50 GMT
Subject: Re: Make GIT_USE_LOOKUP default?
Message-ID: <20130318164950.GA14844@sigill.intra.peff.net>
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