phc-discussions - Re: [PHC] Re: Updated tests document (version 2)

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Message-ID: <20150428011927.GA4161@openwall.com>
Date: Tue, 28 Apr 2015 04:19:27 +0300
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Re: Updated tests document (version 2)

On Mon, Apr 27, 2015 at 04:55:33PM -0700, Bill Cox wrote:
> I see.  It does seem odd to ask the testing volunteer to create his own
> interface to the candidates.
> 
> I think there are just 3 candidates now supporting multiple threads.  It is
> surprisingly hard to guestimate parallel thread performance from parallel
> process performance.  The reasons remain mysterious to me, but the short
> version is that each thread seems to want sole access to it's own page.
> Mixing nearby read/writes between threads thrashes something, maybe the
> translation lookaside buffer?
> 
> I guess I'd like guidance from the PHC panel on this issue, if they want to
> see multi-threaded performance.  It seems like an important attribute to
> me, and there's no knob in the PHS interface.

I would be interested, personally and as a panel member, to see those 3
candidates' (is that Argon2, Lyra2, yescrypt?) multi-threaded
performance included in Milan's reports.  Bill, maybe you can contribute
to Milan's code?  I think it's all on GitHub, so perhaps you can make a
pull request.

BTW, Argon2 is still not formally accepted.  Yet I'd like to see more of
its benchmarks.

Alexander