Date: Tue, 2 Jun 2015 04:52:40 +0300 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Lei's weekly report #5 Lei, On Tue, Jun 02, 2015 at 08:44:56AM +0800, Lei Zhang wrote: > Accomplishments: > - experiment with the newly interleaved SHA256 & SHA512 > - use AVX512/MIC's scatter instruction in SHA1, SHA256 & SHA512 I think it's the first time I hear about the second one of these tasks - "use AVX512/MIC's scatter instruction in SHA1, SHA256 & SHA512" - can you please post a separate report on this? Explain the idea, where it fits in the code, and what results you obtained. Thanks! > Priorities: > - determine the optimal interleaving factors for MIC > - find out formats where OMP_NUM_THREADS isn't optimal for MIC > - now that I know how to correctly build OpenSSL for MIC, try to compare JtR's performance on MIC built with OpenSSL vs LibreSSL I think more importantly than all of those you listed, you need to start reviewing and profiling the generated assembly code. Right now, it is unclear why there's often a slowdown when going from 1x to 2x interleaving, even if in some cases there's a speedup at higher interleaving factors. You need to find this out. Until you do, you're unnecessarily walking blindfolded. Thanks, Alexander
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