phc-discussions - Re: [PHC] A review per day

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Date: Sat, 06 Sep 2014 11:14:29 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] A review per day - Lyra2

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I already made significant changes to the spreadsheet.  In particular,
I needed to break up GPU defense into 3 memory hardness categories,
just like I did for ASICs.  Basically, Yescrypt wins across them all,
but for high memory hashing, GPUs will be massively memory bandwidth
limited, and can only gain at most a factor of the ratio of bandwidths
vs the CPU to it's memory.  I have absolutely no idea where the small
memory reads become the dominant factor over GDDR bandwidth.  The
numbers I put in are unfortunately a total WAG for GPU cracking times.
 However, at 8KiB, I think we act more like bcrypt, and the small
memory reads probably dominate the runtime, and the 3-to-1 speed
factor of Yescrypt to TwoCats may be real.

Unfortunately, these GPU numbers are a total WAG on my part.

Bill
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Download attachment "Lyra2-TwoCats-Yescrypt-comparison.ods" of type "application/vnd.oasis.opendocument.spreadsheet" (54162 bytes)

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