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Message-ID: <20150602015239.GA14510@openwall.com>
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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