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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