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Date: Fri, 9 Sep 2016 03:25:19 +0200
From: Solar Designer <>
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 [1].  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.


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