phc-discussions - Re: [PHC] Argon2 CPU/GPU benchmarks

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Date: Wed, 19 Aug 2015 19:27:30 +0200
From: Dmitry Khovratovich <khovratovich@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: [PHC] Argon2 CPU/GPU benchmarks

>
>
>
> What do you mean by GPU portability here?  Simplifying OpenCL
> implementations for testing, or for actual defensive use of GPUs?
>

Simplifying implementations for testing, in order to realize all the
possible advantages of GPU cracking earlier than the attacker does so.




>
> We don't yet exploit this (except possibly to a very limited extent that
> an OpenCL compiler and the hardware might), so I wouldn't attribute the
> current results to it.  I've been thinking of communicating suggestions
> on how to try exploiting this to Agnieszka today.  So we'll likely try.
> If successful, this should let us pack more concurrent instances of
> Argon2, and should provide much speedup over the results so far (as
> we're not yet bumping into memory bandwidth, by far).
>

What is the parallelism parameter BTW? p=1 for all schemes?


>
> Combined, these result in Titan X being 3072/640*1000/1096 = 4.38 times
> faster.  In case memory bandwidth ever becomes the limiting factor (as
> we optimize the code more), it's similar too: 336/80 = 4.2 times faster.
>

I understand, but why do you get 37x advantage of yescrypt from there?
Don't these properties speed up yescrypt as well?



>
> > > Potential results for GTX Titan X:
> > >
> > > 2480/(1861*3072/640*1000/1096) / (4736/419) = 0.027
> > > 7808/(4227*3072/640*1000/1096) / (4736/419) = 0.037
> > >
> > > or:
> > >
> > > 4736/419 / (2480/(1861*3072/640*1000/1096)) = 37.1
> > > 4736/419 / (7808/(4227*3072/640*1000/1096)) = 26.8
>
> Alexander
>



-- 
Best regards,
Dmitry Khovratovich

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