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Date: Sun, 15 Sep 2013 04:07:33 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: mask mode bug

magnum -

On Sun, Sep 08, 2013 at 06:45:05PM +0200, magnum wrote:
> On 7 sep 2013, at 03:07, Solar Designer <solar@...nwall.com> wrote:
> > $ ./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
> 
> On a side note the above must mean a kernel duration of 1.64 seconds. Targetting 200 ms, 512K would be sane. Are we losing a lot of performance at 512K? (testing that) OK I get 1693Mc/s so we lose 2%.

BTW, note that TITAN has 2688 SPs, which is not a power of two.  Speeds
might be slightly higher if we set GWS to a multiple of SP count.

Alexander

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