phc-discussions - Re: [PHC] GPU benchmarks: Lyra2+yescrypt (was: Another PHC candidates "mechanical" tests (ROUND2))

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Message-ID: <20150704173408.GA24845@openwall.com>
Date: Sat, 4 Jul 2015 20:34:08 +0300
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] GPU benchmarks: Lyra2+yescrypt (was: Another PHC candidates "mechanical" tests (ROUND2))

Hi Marcos,

On Thu, May 07, 2015 at 01:08:13PM -0300, Marcos Simplicio wrote:
> It took some time, but we finally completed the GPU benchmarks mentioned
> in the e-mail below, both for Lyra2 and yescrypt.
[...]

Have you made any further progress on this since May?

I'd like to let you know that Agnieszka Bielec working with us on
integrating support for PHC finalists into John the Ripper, including on
GPU, appears to have achieved a 3x+ speedup for Lyra2 over your CUDA
code, as currently tested at t_cost=8, m_cost=8, N_COLS=256, nPARALLEL=2
(your defaults).  I think this corresponds to 192 KiB per instance:

http://www.openwall.com/lists/john-dev/2015/07/04/5

The current choice of 8 and 8 is arbitrary.  We should test with other
settings as well.  Especially with the lowest t_cost, and higher m_cost,
and with nPARALLEL=1.

Alexander