Date: Thu, 27 Oct 2011 00:17:42 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: OpenMP for MD5-crypt 2011-10-26 09:49, Solar Designer wrote: > On Sat, Oct 22, 2011 at 11:45:46AM +0200, magnum wrote: >> OMP for crypt-MD5 would rock too. (...) > > Actually, I am tempted to do it for the slower code currently in the > main tree, but then I am worried that it'd make integration of faster > SIMD-enabled code trickier. (...) I didn't realise plain john is not SIMD. I see now it's Bartavelle's code in Jumbo. But anyway, it can't be that tricky - worst-case is just a bunch of ifdefs. > That would be good for marketing, even if -jumbo's intrinsics code > performs better. ;-) Everyone doesn't have SSE. And with this slow hash I guess you would get close to 100% efficiency so a quad-core would outperform a single core SIMD. > If I do it, can I count on you for rebasing -jumbo on that updated main > tree (not necessarily introducing similar parallelization for its code, > but merely making it work like it does now)? Sure. Actually now that I'm looking at the code again (and the Jumbo diff in particular) I think the coins finally fell down. As far as I can tell, md5cryptsse() is thread-safe already so we should be able to make use of OMP with SSE without much hassle. magnum
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