Date: Fri, 9 Sep 2016 03:25:19 +0200 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Intel KNL test machine On Thu, Sep 08, 2016 at 12:03:16PM +0800, Lei Zhang wrote: > The memory model also changed. In KNC native mode, all memory usage > happens in the co-processor's 8GB high-bandwidth memory (I forgot the > exact name...). But KNL is a host CPU; it supports normal DDR and in > the meantime also has its own high-bandwidth memory, which is called > MCDRAM . DDR is the default; special functions are needed to > utilize MCDRAM. > > I don't know how much impact memory throughput has on John's > performance. Perhaps John needs to explicitly support KNL's memory > model to fully extract performance from it. For most hash types, there should be almost no difference. For scrypt, Argon2 and such, there should be significant difference. Alexander
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