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Date: Sat, 7 Sep 2013 05:07:52 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
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 <solar@...nwall.com> 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
Alexander
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