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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