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Message-ID: <20150820210313.GA29340@openwall.com>
Date: Fri, 21 Aug 2015 00:03:13 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU
On Thu, Aug 20, 2015 at 10:40:16PM +0200, Agnieszka Bielec wrote:
> 2015-08-20 22:34 GMT+02:00 Solar Designer <solar@...nwall.com>:
> > On Thu, Aug 20, 2015 at 08:04:20PM +0200, Agnieszka Bielec wrote:
> >> 2015-08-19 18:39 GMT+02:00 Solar Designer <solar@...nwall.com>:
> >> > I think you may try working on ulong16 or ulong8 instead. I expect
> >> > ulong8 to match the current GPU hardware best, but OTOH ulong16 makes
> >> > more parallelism apparent to the OpenCL compiler and allocates it to one
> >> > work-item. So please try both and see which works best.
> >>
> >> I created something using ulong8, it's almost not noticeable better
> >> speed in my laptop but worse on super both cards, no idea if this is
> >> what you wanted ( I think that not ), you can take a look on branch
> >> vector8
>
> > You should also
> > use the wider vector type for the global memory references and in the
> > kernel parameter list.
>
> was even more slower (on super, both cards)
Where is the code? Slower now doesn't necessarily mean we're doing
anything wrong - it might also mean we're not doing enough of it yet.
And how much slower was it? Did you try re-tuning LWS and GWS?
Alexander
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