Date: Sun, 12 Aug 2012 17:28:51 +0800 From: myrice <qqlddg@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Result of hard core password generation on 7970 On Wed, Aug 8, 2012 at 5:31 AM, Solar Designer <solar@...nwall.com> wrote: > Thanks. Attached is a patch with some optimizations and comments about > further optimizations to make (perhaps after you're done with bitmaps). > > Your direct comparisons, as implemented, turned out to be slower than > local memory bitmap lookups, so I #if 0'ed them out here. If we choose > to implement them, then maybe try it for the case of exactly 1 loaded > hash only, and avoid the array and loop. > > 1 > guesses: 0 time: 0:00:01:34 0.00% c/s: 2083M > > 1000 > guesses: 0 time: 0:00:01:28 0.00% c/s: 1941G > > These are a bit faster now. > > 1M > guesses: 0 time: 0:00:01:26 0.00% c/s: 851953G > > No speedup for 1M - in fact, a slowdown on this specific test as > compared to your run, but that's kind of random. Indeed, this test is > limited by global memory latency. > > What has happened to the idea of using 4 x 128 MiB bitmaps (like > Multiforcer does) before the hash table lookup (no need to implement > binary search to try this out when we already have the hash table)? > I thought this was on your priorities for this week. > > Thanks, > > Alexander Thanks! I applied your patch and implementing 4 bitmaps. Why this patch didn't work with password generation on CPU and GTX570 on bull? For example, if we have a dictionary file contains a line "passwo" and a hash file with "password" hash. It guessed 0 on CPU and GTX570, but on 7970 it works. If the dictionary file contains "password" directly, then the it can guessed this password. Thanks myrice
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