Date: Wed, 1 Feb 2006 14:51:20 +0300 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: best john optimized architecture? On Tue, Jan 31, 2006 at 10:49:11PM -0800, Arias Hung wrote: > which architecture that in the list of john supported architectures > offer the highest combinations/s? For DES-based Unix crypt(3) hashes, PowerPC G5 (with AltiVec). For non-DES-based hashes, x86. For LM hashes (which are DES-based), PPC/AltiVec and x86/MMX deliver similar performance. > I know this might be subjective as it might also depend on how much memory, No, the amount of memory is completely irrelevant. > This would be very interesting I think to see comparisons between linux-x86-mmx, > Tru64-alpha, ppc32-altivec, ppc64, etc ... Yes, I think I might dedicate a web page to that eventually. Right now, if you want the absolute best performance per CPU, the choice is between PowerPC G5 and the fastest x86's from either Intel or AMD. Alphas deliver better DES performance per-MHz (speaking of 21264A), but their clock rates are nowadays substantially lower than those of the competition (it used to be the other way around some years ago). For ppc32-altivec vs. ppc64, the former is generally faster (it's effectively 128-bit for DES, 32-bit for the rest) - but it's just two ways to build John for the same CPU (except that ppc32-altivec will also work for a G4). If you want best performance for the money, get some Celerons - for this application, they are not any slower than "full" P3s or P4s. For example, a P3 Celeron Tualatin 1.4 GHz ($40 for the CPU) overclocked to 1568 MHz (112x14) does: Benchmarking: Traditional DES [64/64 BS MMX]... DONE Many salts: 515443 c/s real, 515443 c/s virtual Only one salt: 472051 c/s real, 472051 c/s virtual This is more than 50% of the performance of the fastest P4s that are currently available. > Also whether there are any noticeable differences in distro vs distro? > > linux-mmx-x86 vs freebsd-mmx-x86 vs netbsd-mmx-x86? No. > or even OS vs OS > > linux-mmx-x86 vs windows-mmx-x86? No, assuming that you would not use Windows 9x these days. -- Alexander Peslyak <solar at openwall.com> GPG key ID: B35D3598 fp: 6429 0D7E F130 C13E C929 6447 73C3 A290 B35D 3598 http://www.openwall.com - bringing security into open computing environments Was I helpful? Please give your feedback here: http://rate.affero.net/solar
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