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Message-ID: <CAKtfLcvGMzEmMcEuKVPHhQo=uB_o8=NXUKfcTEHA5CPRfCyTUw@mail.gmail.com>
Date: Sun, 15 Sep 2013 09:32:01 -0700
From: Alain Espinosa <alainesp@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: GTX TITAN (was: new dev box wishes)
On 9/15/13, Alain Espinosa <alainesp@...il.com> wrote:
> 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.
This is not only for Nvidia GPU, for a Radeon HD 7970 i get the same
15-20% increase going from vector of 1 element to vector of 3
elements.
saludos,
alain
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