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Subject: Re: [gentoo-amd64] x86_64 optimization patches for glibc.
From: Allan Wang <allanvv@gmail.com>
To: gentoo-amd64@lists.gentoo.org
In-Reply-To: <42E258A7.5080501@telia.com>
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Date: Sat, 23 Jul 2005 12:36:17 -0400
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On Sat, 2005-07-23 at 16:48 +0200, Simon Strandman wrote:
> 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.

Hmm, I don't see much difference here.

before:
allan@aw ~ $ ./a.out 2420 1000 1048576
Memory to memory copy rate = 1110.198486 MBytes / sec. Block size =
1048576.

after:
aw allan # ./a.out 2420 1000 1048576
Memory to memory copy rate = 1154.922974 MBytes / sec. Block size =
1048576.

Allan

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