Gentoo Archives: gentoo-amd64

From: Sami Samhuri <sami@××××××××××.com>
To: gentoo-amd64@l.g.o
Subject: Re: [gentoo-amd64] Re: x86_64 optimization patches for glibc.
Date: Wed, 27 Jul 2005 01:48:51
Message-Id: 20050727000501.GB4009@no-eff-eks.com
In Reply to: [gentoo-amd64] Re: x86_64 optimization patches for glibc. by Duncan <1i5t5.duncan@cox.net>
* 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