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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: Sami Samhuri <sami@...>
Subject: Re: Re: x86_64 optimization patches for glibc.
Date: Tue, 26 Jul 2005 17:05:01 -0700
* On Tue Jul-26-2005 at 09:50:00 AM -0700, Duncan said:
[...]
> Of course, that's just supposition, here.  If those with the 1100/2200
> rates would confirm whether they are running in dual-channel memory mode,
> as I suspect, and you confirm that you are running single-channel mode, as
> I am, it'll pretty much confirm that supposition, however.

glibc-2.3.5 (patched)
gentoo-sources-2.6.12-r4
linux-headers-2.6.11-r2
2x Opteron 246 (2GHz)
2x 512M, on processor #0 (dual channel)

% ./a.out 2000 5000 1048576
Memory to memory copy rate = 1367.611206 MBytes / sec. Block size = 1048576.
% ./a.out 4000 5000 1048576
Memory to memory copy rate = 2822.960693 MBytes / sec. Block size = 1048576.

Since only 1 processor is used in this test I'm not sure which processor
speed I should use, and hence which result is accurate. In any case they
take the same amount of time, ~3.7s.

-- 
Sami Samhuri
Attachment:
pgpNAf33uaZii.pgp (PGP signature)
References:
x86_64 optimization patches for glibc.
-- Simon Strandman
Re: x86_64 optimization patches for glibc.
-- Luke-Jr
Re: x86_64 optimization patches for glibc.
-- Olivier Crete
Re: x86_64 optimization patches for glibc.
-- Luke-Jr
Re: x86_64 optimization patches for glibc.
-- Duncan
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Updated Jun 17, 2009

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