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Date: Sun, 12 Feb 2017 09:32:58 +0100
From: Patrick Proniewski <p+password@...atpro.net>
To: john-users@...ts.openwall.com
Subject: Re: to Single or not to Single

Hi,

Should I try and write a bug report about this on github?

regards
patpro

On 05 févr. 2017, at 09:26, Patrick Proniewski wrote:

> On 04 févr. 2017, at 21:33, Solar Designer wrote:
> 
>> That said, I think it'd be even better to figure out and fix whatever
>> issue is causing the extremely poor performance, and then you won't have
>> to worry about those extra candidates being tested - in fact, you'd want
>> more of them to be tested.
> 
> I do agree.
> I've made another test, that probably compares with the --test function. I've ran this:
> 
> time ./john --single=None --nolog --verbosity=1 aa-postsingle --pot=dummy3.pot
> Using default input encoding: UTF-8
> Loaded 1395762 password hashes with 1395762 different salts (dynamic_25 [sha1($s.$p) 128/128 AVX 4x1])
> Press 'q' or Ctrl-C to abort, almost any other key for status
> 0g 0:00:00:03 50.00% (ETA: 21:44:44) 0g/s 0p/s 0c/s 0C/s
> 0g 0:00:00:04 50.00% (ETA: 21:44:46) 0g/s 407283p/s 407283c/s 407283C/s messershre
> 0g 0:00:00:04 DONE (2017-02-04 21:44) 0g/s 477983p/s 477983c/s 477983C/s rolltide1!..rrolltide1!
> Session completed
> 
> 
> real    0m13.070s
> user    0m10.627s
> sys     0m2.391s
> 
> where "aa-postsingle" is a file containing only hashes remaining after the end of a --single=None run. To sum it up, it contains only hashes that wont be cracked by the given candidate. No super-fast, but really good compared to files with a mix of good and bad candidates.
> 
> So it looks like it's really the mix of good and bad candidates that impact performance.
> 
> patpro

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