Toon Moene wrote:
I wouldn't be to sure of that. Recently I became interested in the divisors of a given natural number.
I suspect small programs can be written to show almost any kind of interesting behavior. [program snipped]
The execution time difference was about 2 orders of magnitude.
My guess is that this is a perfect x86-64 program. Everything fits in the cache, and there are enough registers so that all the variables fit in registers. The experiment I tried was to build several fairly large programs on Fedora Core 6 32 bit and then 64 bit using exactly the same hardware. This is clearly not the same kind of test as your example but it's more relevant as a systems-level comparison. If I remember, I built mysql and apache. This took about the same amount of time in both modes. I suspect that the Beowulf crowd would have lots of experience with 32-bits vs 64-bits question, so I'd welcome additional comments, especially dealing with situations where programs *don't* need the additional address space of the 64-bit model. Cordially, -- Jon Forrest Unix Computing Support College of Chemistry 173 Tan Hall University of California Berkeley Berkeley, CA 94720-1460 510-643-1032 [EMAIL PROTECTED] _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
