john-users - Re: AMD X6 multicore issue

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Date: Sat, 3 Dec 2011 10:53:40 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: AMD X6 multicore issue

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