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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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