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Date: Fri, 28 Oct 2011 09:54:26 +0400
From: "Elijah [W&P]" <smarteam.support@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: OpenMP for MD5-crypt

When trying to build win32-cygwin-x86-sse2
after 0032-j7-Crypt-MD5-OMP-SSE.patch, without "OMPFLAGS = -fopenmp"
uncommented everything is testing fine, with it I get:

Benchmarking: FreeBSD MD5 [32/32]... FAILED (get_hash[0](1))

On 27 October 2011 21:44, magnum <john.magnum@...hmail.com> wrote:

> 2011-10-27 00:17, magnum wrote:
> > 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.
> ...
> >> 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.
>
> It turned out md5cryptsse() was not thread-safe, but fixing that was
> just a matter of moving a couple of global buffers into the function.
> And adding OMP to MD5_fmt.c (for SSE only) was very easy once the coin
> fell down. Patch uploaded to wiki as 0032. Efficiency is excellent.
> Tested a lot, no problems.
>
> I also changed x86-64.h so we use 12x when building with icc, and 8x for
> gcc.
>
> Benchmarking: FreeBSD MD5 [12x]... DONE
> Raw:    28368 c/s real, 28368 c/s virtual
>
> Benchmarking: FreeBSD MD5 [12x]... (2xOMP) DONE
> Raw:    53568 c/s real, 26918 c/s virtual
>
> magnum
>
>

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