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Message-ID: <BLU159-W1057F88597BD2F68C8ABF9A4840@phx.gbl>
Date: Sat, 21 Jan 2012 13:58:12 +0000
From: Alex Sicamiotis <alekshs@...mail.com>
To: <john-users@...ts.openwall.com>
Subject: RE: DES with OpenMP
> Date: Sat, 21 Jan 2012 15:15:50 +0400
> From: solar@...nwall.com
> To: john-users@...ts.openwall.com
> Subject: Re: [john-users] DES with OpenMP
>
> On Sat, Jan 21, 2012 at 12:22:18AM +0000, Alex Sicamiotis wrote:
> > ... assuming (erroneously) that the code is identical... Apparently it has significant differences that speed up the OMP version and the nonOMP version is somewhat suboptimal (?).
>
> In your case, yes. In most other cases, it's the other way around.
>
> Things should be more reasonable with GCC 4.3.
>
> Alexander
Results are in (@4GHz / no x.org / 1.7.9 plain - no jumbo):
1. No-omp / ASM=0
GCC 4.3.4 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 4444K c/s real, 4444K c/s virtual
Only one salt: 4262K c/s real, 4262K c/s virtual
GCC 4.6.2 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 3370K c/s real, 3370K c/s virtual
Only one salt: 3265K c/s real, 3265K c/s virtual
ICC 12.1 (-fast -march=core2)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 4487K c/s real, 4487K c/s virtual
Only one salt: 4316K c/s real, 4316K c/s virtual
...so GCC 4.3.4 does great here but ICC slightly outperforms it.
2. OMP with NUM_THREADS=1
GCC 4.3.4 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 4131K c/s real, 4131K c/s virtual
Only one salt: 3780K c/s real, 3782K c/s virtual
GCC 4.6.2 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 4168K c/s real, 4168K c/s virtual
Only one salt: 3813K c/s real, 3813K c/s virtual
ICC 12.1 (-fast -march=core2)
Many salts: 4625K c/s real, 4625K c/s virtual
Only one salt: 4187K c/s real, 4187K c/s virtual
Almost identical performance for 4.3.4 / 4.6.2...
3. OMP with NUM_THREADS=2
GCC 4.3.4 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 7932K c/s real, 3969K c/s virtual
Only one salt: 6268K c/s real, 3134K c/s virtual
GCC 4.6.2 (-O2 -march=nocona)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 7967K c/s real, 3983K c/s virtual
Only one salt: 6316K c/s real, 3158K c/s virtual
ICC 12.1 (-fast -march=core2)
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 8900K c/s real, 4450K c/s virtual
Only one salt: 7153K c/s real, 3575K c/s virtual
Again, almost identical performance for 4.3.4 / 4.6.2... the biggest difference of 4.3.4 vs 4.6.2 in my case seems to be the non-OMP build which reaches almost ICC levels.
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