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Message-ID: <20150713173144.GB12357@openwall.com>
Date: Mon, 13 Jul 2015 20:31:44 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Lyra2 on GPU
Agnieszka,
On Mon, Jul 13, 2015 at 04:33:24PM +0200, Agnieszka Bielec wrote:
> 2015-07-12 16:55 GMT+02:00 Solar Designer <solar@...nwall.com>:
> > Can you also try:
> >
> > t = 1
> > m = 80
> > c = 256
> > p = 1
> >
> > This should be almost 2 MB.
>
> these tests are for 960m this time
Of course, I meant this for a bigger card.
> and I discovered now that the best number of lws also differ for
> various costs but it isn't autotuned
Why isn't it auto-tuned?
> >> I said that I'm using local memory but I wanted to say __private ,
> >> sorry if caused confusion
> >
> > OK. I guess you're putting the current row (24 KB) in there? And when
> > you were using global memory before, you had the current row fetched
> > from and sent to global memory each time?
>
> it's not 24KB. I wrote that there are very small chunks an when I
> tried 2x, 3x, 5x bigger - speed decreased.
> but I'm sceptic about so huge cache in local memory because we have
> e.g. 32KB for all lws number of threads and speed will decrease after
> only if I change lws from 64 to 1
You're right indeed.
So how much private memory are you using per Lyra2 instance?
Alexander
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