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Date: Wed, 7 Sep 2016 15:25:16 +0200
From: Solar Designer <>
Subject: Re: Intel KNL test machine

Hi Lei,

On Wed, Sep 07, 2016 at 07:41:06PM +0800, Lei Zhang wrote:
> It's been a while since I last posted to john-dev :D

Welcome back!

> I've just got access to a new KNL machine; I'm not sure what exact
> model it is, but it has 64x4 cores and /proc/cpuinfo says "Intel(R)
> Xeon Phi(TM) CPU 7210 @ 1.30GHz".
> I guess some of you might be interested how JtR performs on this
> beast. Just let me know if there's any kind of benchmark you want me
> to test. And please keep the benchmarking easy to follow, or I may not
> have enough time for it :)

Yes, thanks.  Lukas already ran some benchmarks on a similar device, but
I think he never published those, in part because the descrypt ones were
for AVX2 rather than AVX-512.  We need to fix the code so that we would
use AVX-512 for descrypt - this might be as simple as treating __AVX512F__
same as __MIC__ in more places - perhaps in DES_bs_b.c and in some .h
files.  Maybe you can fix this for and prior to running your benchmarks?

As to what benchmarks, let's start with a simple "--test" of the CPU
formats (treating this device as a CPU).


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