Date: Sun, 26 Apr 2015 19:30:24 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] JtR SIMD support enhancements On Thu, Apr 23, 2015 at 11:35:44PM +0800, Lei Zhang wrote: > Benchmarking: nt2, NT [MD4 512/512 MIC 16x]... DONE > Raw: 4907K c/s real, 4907K c/s virtual So this is one 1 GHz core running AVX-512. Here's my 2.3 GHz laptop running AVX: Benchmarking: nt2, NT [MD4 128/128 AVX 4x3]... DONE Raw: 43748K c/s real, 43748K c/s virtual Accounting only for clock and width, the MIC should do 83519K. What is it that makes it 17x slower than that figure? Comparing a slow hash and threads, here's MIC's md5crypt: Benchmarking: md5crypt, crypt(3) $1$ [MD5 512/512 MIC 16x]... (240xOMP) DONE Raw: 864932 c/s real, 3627 c/s virtual And here's mine (4 cores + HT): $ ../run/john -test -form:md5crypt Will run 8 OpenMP threads Benchmarking: md5crypt, crypt(3) $1$ [MD5 128/128 AVX 4x3]... (8xOMP) DONE Raw: 159360 c/s real, 22102 c/s virtual MIC should do 9127K if only clock and width was different. The real figure is 10x slower than that. Why? magnum
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