[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <6e612f7ee26422c178586d29d944aea9@smtp.hushmail.com>
Date: Thu, 20 Aug 2015 03:37:33 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Formats using non-SIMD SHA2 implementations
On 2015-08-19 17:52, Lei Zhang wrote:
> Anyway, I applied the optimizations we discussed so far to 7z, including sorting passwords by length (Jim's idea) and using double-buffer (magnum's idea). I compared the performance of the optimized SIMD code, my previous naive SIMD code and the scalar code. See the figures below. (Specs: AVX2, 8-HT)
>
> OpenMP disabled:
>
> [scalar]
> Raw: 12.7 c/s real, 12.7 c/s virtual
> [naive SIMD]
> Raw: 48.2 c/s real, 48.2 c/s virtual
> [optimized SIMD]
> Raw: 48.6 c/s real, 48.6 c/s virtual
>
> OpenMP enabled:
>
> [scalar]
> Raw: 49.1 c/s real, 6.4 c/s virtual
> [naive SIMD]
> Raw: 72.3 c/s real, 9.3 c/s virtual
> [optimized SIMD]
> Raw: 201 c/s real, 26.7 c/s virtual
>
> As you can see, single-threaded performance of the optimized SIMD code shows no benefit, but multi-threaded performance is much better. The code becomes much more unreadable than before, but I think it's worth it :)
Will you wrap this up in a PR before "pencils down"? I can't see it in
your repo at all. BTW I presume you've seen PR #1682? Merging that with
your code should be trivial either way we do it.
magnum
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
