On 10/30/07, Aaron Kulkis <[EMAIL PROTECTED]> wrote: > Robert Lewis wrote: > > I recently bought a 64 bit machine and have 10.3 loaded . It seems very > > fast. > > > > I am trying to appraise if the advantages of having some software not work > > because of driver issues is worth it. > > > > Has anyone run benchmarks on an identical system with 32 bit vrs 64 bit? > > > > Do we have a list of software that is known not to work on 64-bit? > > Any defined group tracking this and championing gettin the remainder > > fixed. > > > > I know this is a generalized question but I am just trying to appraise > > the gain vrs pain of deciding to stay with 64-bit ? > > Most data isn't 64-bit. In fact, a large chunk of it > is still 16-bit, and even 8 bit (ASCII text, for example). > > Most of the speed increase you are seeing is from: > > 1) the faster clock speed of your new CPU compared > to the last one you had. > > 2) wider data buses into and out of the on-chip cache. > > 3) floating point operations (where applicable). > > You won't see a significant difference between > 32-bit and 64-bit system performance until you > are running some software which uses lots of > 64-bit integers, or is very intensive in > floating-point operations. >
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 Were still putting together a performance matrix, but we're planning to test: 32-bit kernel - 32-bit app 64-bit kernel - 32-bit app 64-bit kernel - 64-bit app So far we've tested the last 2 and are seeing about a 25% improvement by just recompiling dcfldd as a 64-bit app. I was not expecting that at all. 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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
