Date: Thu, 5 Apr 2012 16:19:49 +0800 From: myrice <qqlddg@...il.com> To: john-dev@...ts.openwall.com Subject: Re: fast hashes on GPU On Tue, Apr 3, 2012 at 9:07 PM, Solar Designer <solar@...nwall.com> wrote: > > > For salts, you'd only achieve an effect very similar to what you'd > achieve by simply using a much larger max_keys_per_crypt value (more > work done per one interaction with GPU). Thus, I expect that with or > without the salts trick, you'd achieve similar performance as long as > max_keys_per_crypt is properly tuned for each case separately. > > Yes, I using a much larger max_keys_per_crypt. ( 128*KEYS_PER_CRYPT, THREADS: 512, BLOCK: 32, sm_13) On GTX580, Before: Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE Many salts: 70254K c/s real, 70964K c/s virtual Only one salt: 27262K c/s real, 27262K c/s virtual After: Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE Many salts: 72673K c/s real, 72673K c/s virtual Only one salt: 27439K c/s real, 27698K c/s virtual Enlarge either MAX_KEYS_PER_CRYPT or BLOCK size will reduce the performance. I think it is a lot of data transfer that takes time. Thanks! Dongdong Li Content of type "text/html" skipped
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