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Date: Sun, 15 Mar 2015 05:23:43 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: AVX2
On Sun, Mar 15, 2015 at 04:20:25AM +0300, Solar Designer wrote:
> On Sun, Mar 15, 2015 at 04:09:32AM +0300, Solar Designer wrote:
> > On our i7-4770K, before:
> >
> > solar@...l:~/j/john-1.8.0.4.orig/src$ ../run/john -te -form=descrypt
> > Will run 8 OpenMP threads
> > Benchmarking: descrypt, traditional crypt(3) [DES 128/128 AVX-16]... DONE
> > Many salts: 25087K c/s real, 3139K c/s virtual
> > Only one salt: 20375K c/s real, 2550K c/s virtual
> >
> > After:
> >
> > solar@...l:~/j/john-1.8.0.4-avx2/src$ ../run/john -te -form=descrypt
> > Will run 8 OpenMP threads
> > Benchmarking: descrypt, traditional crypt(3) [DES 256/256 AVX2-16]... DONE
> > Many salts: 43489K c/s real, 5443K c/s virtual
> > Only one salt: 30002K c/s real, 3755K c/s virtual
>
> and even:
>
> Benchmarking: descrypt, traditional crypt(3) [DES 256/256 AVX2-16]... DONE
> Many salts: 44820K c/s real, 5609K c/s virtual
> Only one salt: 32001K c/s real, 4006K c/s virtual
>
> with DES_bs_cpt reduced from 32 to 16.
and slightly higher single-salt speed:
Benchmarking: descrypt, traditional crypt(3) [DES 256/256 AVX2-16]... DONE
Many salts: 44820K c/s real, 5609K c/s virtual
Only one salt: 32420K c/s real, 4056K c/s virtual
with:
#define vshl1(dst, src) \
(dst) = _mm256_add_epi8((src), (src))
(Obviously, the cumulative speed for --fork=8 should be higher yet.)
I've also tried various mixed builds: 256+256, 256+128, 256+64 MMX,
256+64 scalar, 256+64 MMX+64 scalar. All of them are slower. (I had
previously tried them for 256-bit AVX. Now re-tried them for AVX2.)
Alexander
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