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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: Allan Wang <allanvv@...>
Subject: Re: x86_64 optimization patches for glibc.
Date: Sat, 23 Jul 2005 12:36:17 -0400
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

-- 
gentoo-amd64@g.o mailing list


Replies:
Re: x86_64 optimization patches for glibc.
-- Brian Litzinger
Re: x86_64 optimization patches for glibc.
-- Simon Strandman
References:
x86_64 optimization patches for glibc.
-- Simon Strandman
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Updated Jun 17, 2009

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