Pieter de Goeje wrote:
On Wednesday 20 December 2006 11:38, Mark Kirkwood wrote:
In fact if you note that the PIII HW *can* actually do 700MB/s, it
suggests that your HW is capable of considerably more than 900MB/s -
given that opteron's have excellent cpu to memory bandwidth, and the
speed of your memory!
Indeed!
Copying /dev/zero to /dev/null yields more than 5GB/sec on a simple 2Ghz
Athlon64. It imagine there are quite a few extra things done when copying a
file from cache, because I can only manage to get one fifth (~1GB/sec) of the
theoretical speed. (this is with a file that fills more than half of all
memory)
Fascinating, never thought of trying that! On my 2 (essentially)
identical PIII systems, doing copy /dev/zero to /dev/null yields 4.1
GB/s (Gentoo) and 2.0GB/s (FreeBSD) - so yeah, clearly both do
something special in that case... (growl... we - i.e FreeBSD - seem to
be slower again...tho at that sort of rate, who cares!)
Cheers
Mark
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