On 10/30/07, Jan Engelhardt
On Oct 30 2007 13:46, Greg Freemyer wrote:
Surprisingly (to me at least) we are seeing a speed improvement with a specialized version of dd (dcfldd) going against raw disks.
ie. dcfldd if=/dev/sdb of=/dev/sdc bs=4k and dcfldd if=/dev/sdc of=/dev/null bs=4k
Bottleneck: Disk. You cannot really use something like dd or variants to benchmark your CPU. What you can do is comparing the encoding time of oggenc or so (but be sure to use the SSE2 mode in the 32-bit compilation mode before testing, because x64 uses SSE2 by default).
I fully expected the disk to be the only bottleneck. My surprise was that 32/64 bit compile issues had any impact at all. Let alone 25% faster with full 64-bit. FYI: I'm using dcfldd as my benchmark tool because it _is_ my workload!! Indeed we have 4 computers dedicated to running it with a few simple scripts automating the process. We are in the process of replacing the PCs and upgrading to 10.3 as our OS. (We call the process "Forensic Imaging".) Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org