Date: Sun, 8 Jul 2012 09:35:31 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Between 1.7.9-jumbo-3 and 1.7.9-jumbo-4 performance of --format=bf dropped by more than 20% On Sun, Jul 08, 2012 at 12:13:54AM +0200, Frank Dittrich wrote: > I tested generic, which brought back the old bf speed. > > May be we could point out in doc/INSTALL, that we tried to find optimal > settings for the build targets listed, but that for a few exceptions a > generic build can be faster for a particular benchmark than the "most > common" build target for an architecture. Maybe. Or we could simply introduce an -atom target, as long as that's what we're facing the issues with. We could include this optimization for DES as well: http://www.openwall.com/lists/john-users/2010/06/28/1 > For the jumbo build, we could even point out that trying alternative > compilers like clang vs. gcc or different gcc versions can make a > siginificant difference for those (new) formats which have not been that > much optimized than the core formats. I think this is what people assume by default. In fact, we heard from a lot of people trying different compilers before and making (wrong) conclusions based on the lack of a change in performance - that was when x86 builds were almost 100% assembly for the performance-critical parts. Alexander
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