[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <bbdcfb664dfe96f46321c1d4f83ca9d5@smtp.hushmail.com>
Date: Sun, 1 Oct 2017 00:38:17 +0200
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: OMP vs. OpenCL performance
On 2017-09-30 18:12, Scott I. Remick wrote:
> On 09/29/2017 09:44 AM, Frank Dittrich wrote:
>> Actually, john will provide that information :
>
> Ok here what I had gotten:
>
> ~/JohnTheRipper/run$ ./john --session=opencl
> --format=PBKDF2-HMAC-SHA512-opencl hash.txt
> Device 0: GeForce GTX 750
> Using default input encoding: UTF-8
> Loaded 1 password hash (PBKDF2-HMAC-SHA512-opencl, GRUB2 / OS X 10.8+
> [PBKDF2-SHA512 OpenCL])
> Cost 1 (iteration count) is 48543 for all loaded hashes
>
> So if the "48543" is what you thought would need to be over 500K to
> account for the speed, then I suppose maybe there is indeed a
> problem...? Currently been running 1 day, 13h, on phase 3/3 and 777p/s
>
One (or some) of the format's test vectors have an iteration count of
10000. You can benchmark it like this:
$ ../run/john -test -form:PBKDF2-HMAC-SHA512 -cost:10000
Will run 8 OpenMP threads
Benchmarking: PBKDF2-HMAC-SHA512, GRUB2 / OS X 10.8+ [PBKDF2-SHA512
128/128 AVX 2x]... (8xOMP) DONE
Speed for cost 1 (iteration count) of 10000
Raw: 721 c/s real, 96.2 c/s virtual
The figure above is from a 5 yo laptop w/ 4 cores 8 threads and clocked
at a relaxed 2.3 GHz. Unless I'm totally senile right now, that should
mean a figure of about 148 c/s for 48583 iterations and you only only
get a tenth of that? I have no idea why (unless your gear is also
occupied with computing other things).
Try that exact benchmark and report your outcome. The system should be
idle when benchmarking, of course.
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.
