john-users - Re: AMD X6 multicore issue

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Message-ID: <CANqqEdcsYkr5RXvr=4NNq1W11wtpQHVPJtUWVWu=VJ7Xbp5SxA@mail.gmail.com>
Date: Sat, 3 Dec 2011 11:07:38 +0200
From: Caesarmv <caesarmv@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: AMD X6 multicore issue

Thank you for your answers.

One more question:

I'm trying to get 9 character pass (SHA512).
I'm using 1.7.9 with openMP and default settings.
Command line: ./john pass.txt

How much time it can take to decrypt such password?
Are there any restrictions for pass length or I can decrypt pass with any
length with default john settings?

Thanks

2011/12/3 Solar Designer <solar@...nwall.com>

> On Fri, Dec 02, 2011 at 04:58:53PM +0200, Caesarmv wrote:
> > I got performance:
> >
> > * guesses: 0  time: 0:00:04:41 (3)  c/s: 1752  trying: o2c - saban*
>
> This is as expected.
>
> > Is it possible to use  version 1.7.9 with GPU?
>
> Not 1.7.9 specifically, but yes:
>
> http://openwall.info/wiki/john/GPU
>
> You need to apply the john-1.7.8-allcuda-0.3.diff patch on top of the
> 1.7.8 release (non-jumbo).  You can download 1.7.8 here:
>
> http://download.openwall.net/pub/projects/john/1.7.8/
>
> and the patch here:
>
> http://openwall.info/wiki/john/patches
>
> > What performance I will get with modern video card?
>
> This gives about 4800 c/s on a GTX 460:
>
> http://openwall.info/wiki/john/GPU#SHA512-based-crypt
>
> Yes, you need an NVidia card for the current implementation.
>
> You'll probably want to run two instances of John at once: one for your
> GPU and the other for your CPU cores (maybe setting OMP_NUM_THREADS=5
> will be more optimal then, leaving one CPU core for the GPU run - you'll
> need to experiment with this).
>
> Alexander
>

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