Date: Thu, 06 Nov 2014 07:30:09 +0100 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: Discuss Mask-mode with GPUs and changes required for its support. On 2014-11-05 18:55, Frank Dittrich wrote: > I think the GPU mask processor should support just a very limited > functionality, i.e., just '?w' and ranges of characters, and core john > should preprocess --mask and -1 ... -9 into a mask that the GPU formats > understand. > That way, --mask mode can be enhanced without the need to adjust all the > GPU formats. I'm sure that is Sayantan's plan. GPU will get preprocessed arrays of characters per position, or something like that. Also, I believe CPU will still process part of the mask. Eg. if your kernel wants ~250 million candidates per crypt_all() for a duration of about 100 ms, it could load 256K words (produced by wordlist + CPU partial mask) and apply the rest of the mask on GPU side, multiplying with yet another 1K. In that example, transfer would be 1/1000th compared with CPU-only generation. I think we should normally aim for 100-200ms kernel duration, for many reasons. magnum
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