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Date: Mon, 17 Aug 2015 17:43:33 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: FMT_OMP_BAD
On Mon, Aug 17, 2015 at 05:23:55PM +0300, Solar Designer wrote:
> wpapsk is in there by mistake. It's a slow format that should show good
> OpenMP scaling, and it does when I test it now:
>
> [solar@...er run]$ OMP_NUM_THREADS=1 ./john-omp -test -form=wpapsk
> Warning: OpenMP is disabled; a non-OpenMP build may be faster
> Benchmarking: wpapsk, WPA/WPA2 PSK [PBKDF2-SHA1 128/128 AVX 4x]... DONE
> Raw: 1308 c/s real, 1308 c/s virtual
>
> [solar@...er run]$ OMP_NUM_THREADS=10 ./john-omp -test -form=wpapsk
> Will run 10 OpenMP threads
> Benchmarking: wpapsk, WPA/WPA2 PSK [PBKDF2-SHA1 128/128 AVX 4x]... (10xOMP) DONE
> Raw: 11560 c/s real, 1154 c/s virtual
>
> There must have been some glitch during my benchmarks causing wpapsk to
> appear to scale poorly.
Confirmed that it was a glitch (unrelated server load?) by reviewing the
individual benchmarks' output. wpapsk's benchmark at 10 threads was:
Benchmarking: wpapsk, WPA/WPA2 PSK [PBKDF2-SHA1 128/128 AVX 4x]... (10xOMP) DONE
Raw: 3120 c/s real, 311 c/s virtual
Nearby benchmarks (the previous and the next format benchmarked) look
unaffected.
Alexander
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