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Message-ID: <CAKtfLcvAt=ymThMWr6kDxZa4m5VXaCtddVm+LPJrMvH9gG1Q4g@mail.gmail.com>
Date: Sun, 15 Sep 2013 09:12:27 -0700
From: Alain Espinosa <alainesp@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: GTX TITAN (was: new dev box wishes)
On 9/14/13, Solar Designer <solar@...nwall.com> wrote:
> I guess these results may teach us something about optimization for this
> GPU (and other Kepler GPUs?) - four-element vectors or(/and?)
> interleaving of independent instructions give best results.
For a GT 630 (compute capability 2.1) using a vector of 3 elements for
NTLM hashing give a ~15-20% performance increase compared with a
vector of 1 element. I think vectors of 2-3 elements are best because
they reduce the number of registers providing sufficient parallelism,
but i do not test this assertion in a 3.5 GPU.
saludos,
alain
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