Date: Fri, 14 Sep 2012 00:32:30 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU Hi Sayantan, On Mon, Sep 10, 2012 at 01:12:54PM +0530, Sayantan Datta wrote: > Here's the result of keeping B in local memory. [...] > Benchmarking: DES BS [128/128 BS XOP-16]... DONE > Many salts: 19942K c/s real, 130023K c/s virtual > Only one salt: 15617K c/s real, 45875K c/s virtual This is a nice improvement compared to your initial try. It's CPU-like speed now (comparing CPU vs. GPU per-chip), except that the program is less interactive than it is when using CPU. To see the speed of the hashing loop on GPU alone, I've tried running this with 2501 iterations (and my special test hash). I got: Raw: 410401 c/s real, 209715K c/s virtual (no single-salt vs. multi-salt since I only had one test hash, and thus one test salt). So that's about 41M c/s at 25 iterations if you somehow manage to remove the overhead. In other words, the overhead still corresponds to about 50% of total running time. Thanks, Alexander
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