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Date: Thu, 2 Aug 2012 20:42:43 +0400
From: Solar Designer <>
Subject: Re: Result of hard core password generation on 7970

On Fri, Aug 03, 2012 at 12:32:23AM +0800, myrice wrote:
> Here is bitmaps result, currently I only use global memory.
> 1: guesses: 0  time: 0:00:01:22 0.00%  c/s: 758186K ~= 758M c/s

Are you using the bitmap even with just 1 hash loaded?  In the real
implementation, I guess you'll need to do direct comparisons when the
number of loaded hashes (for the current salt if applicable) is below a
threshold (like just 1 or 2).

> 1000: guesses: 0  time: 0:00:01:16 0.00%  c/s: 515938M ~= 515M c/s
> 1M:guesses: 0  time: 0:00:01:51 0.00%  c/s: 353254G  ~= 353M c/s

OK, this is an improvement upon what you had before.

> For further performance gains. I am trying to use local memory when
> the bitmaps size is less than 8KB. I am debugging this(load bitmaps
> from global memory to local memory seems not work, still
> investigating).

As an option, you could form the bitmap in local memory right away,
based on the list of loaded hashes for the current salt.  I guess you'd
have to redo it for every crypt_all() call, though.


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