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Date: Sat, 7 Sep 2013 05:07:52 +0400
From: Solar Designer <>
Subject: Re: mask mode bug

On Thu, Sep 05, 2013 at 08:35:18PM +0200, magnum wrote:
> On 5 Sep, 2013, at 19:44 , Solar Designer <> wrote:
> > FWIW, when I run Sayantan's bleeding-mask from a week ago (didn't update
> > since then) on "well" against a single raw-md5 hash, it uses over 1300 MB
> > on the GTX TITAN card.  (Perhaps the same per-GPU on 7990, but there's
> > no easy reporting of that.)
> Do you have any idea what GWS you were using at that time? I run very low, 64K or lower depending on mask.

I did not adjust GWS, so:

$ ./john pw -pla=2 -form=raw-md5-opencl -mask='?l?l?l?l?l?l?l?l?l?l'
Device 4: GeForce GTX TITAN
Local worksize (LWS) 64, global worksize (GWS) 4194304
Loaded 1 password hash (Raw-MD5-opencl [MD5 OpenCL (inefficient, development use only)])
Press 'q' or Ctrl-C to abort, almost any other key for status
Using kernel md5_ccc...
0g 0:00:03:02 0g/s 2554Kp/s 1729Mc/s 1729MC/s aaabneuvrs

| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|   0  GeForce GTX TITAN   Off  | 0000:01:00.0     N/A |                  N/A |
| 52%   77C  N/A     N/A /  N/A |     1334MB /  6143MB |     N/A      Default |

With GWS=65536, memory usage reduces to "740MB" - still too much for
cracking of one hash, but is more reasonable.  Unfortunately, the speed
is worse:

0g 0:00:03:04 0g/s 1976Kp/s 1342Mc/s 1342MC/s aaabetnqcu..aaabetpmpb


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