Gentoo Archives: gentoo-amd64

From: Sean Johnson <gutenpress@×××××.com>
To: gentoo-amd64@l.g.o
Subject: Re: [gentoo-amd64] x86_64 optimization patches for glibc.
Date: Sat, 23 Jul 2005 16:41:17
Message-Id: 11fc6a2505072309398e4edf2@mail.gmail.com
In Reply to: [gentoo-amd64] x86_64 optimization patches for glibc. by Simon Strandman
I just reproduced your results. After emerging glibc with your overlay I get:

Memory to memory copy rate = 2265.193604 MBytes / sec. Block size = 1048576.

I was getting ~1100 before.

Nothing has broken yet, but if it does, I'll be sure to post. :)

On 7/23/05, Simon Strandman <simon.strandman@×××××.com> wrote:
> Hi! > > Some binary distros like Mandrake and suse patches their glibcs with > x86_64 optimized strings and an x86_64 optimized libm to improve > performance. > > I tried extracting those patches from an mandrake SRPM and add them to > the glibc 2.3.5 ebuild. The x86_64 optimized strings patch built and > worked perfectly and gave a large speedup as you can see below. But I > couldn't get glibc to build with the libm patch because of unresolved > symbols (and I'm no programmer so I have no idea how to fix that). > > I found a small C program on a suse mailing-list to measure glibc memory > copy performance: > http://lists.suse.com/archive/suse-amd64/2005-Mar/0220.html > > With the glibc 2.3.5 currently in gentoo I get: > isidor ~ # ./memcpy 2200 1000 1048576 > Memory to memory copy rate = 1291.600098 MBytes / sec. Block size = 1048576. > > But with glibc 2.3.5 + amd64 optimized strings I get: > isidor ~ # ./memcpy 2200 1000 1048576 > Memory to memory copy rate = 2389.321777 MBytes / sec. Block size = 1048576. > > That's an improvement of over 1000mb/s! Suse 9.3 also gives about > 2300mb/s out of the box. > > How about adding these patches to gentoo? Perhaps in glibc 2.3.5-r1 > before it leaves package.mask? I'll create a bugreport about it if you > agree! > > This .tar.bz2 contains the glibc directory from my overlay with the > mandrake patches included in files/mdk, but the libm patches are > commented out in the ebuild. > http://snigel.no-ip.com/~nxsty/linux/glibc.tar.bz2 > > -- > Simon Strandman <simon.strandman@×××××.com> > > -- > gentoo-amd64@g.o mailing list > >
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