Date: Tue, 13 Aug 2013 11:00:49 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: key-length for mask mode. On Tue, Aug 13, 2013 at 11:33:34AM +0530, Sayantan Datta wrote: > On Tue, Aug 13, 2013 at 10:51 AM, Solar Designer <solar@...nwall.com> wrote: > > > [...] And yes, myrice's code achieved a similar speed, > > including with more hashes - IIRC, we were testing with 1M and 10M, as > > well as with a few thousand, and the speed somehow varied between > > invocations, sometimes being above 3000M c/s and sometimes below. (This > > is twice slower than hashcat's, though.) > > I have tested myrice PG-test branch without any tweaks: > > OpenCL platform 0: AMD Accelerated Parallel Processing, 2 device(s). > Using device 0: Tahiti > Local work size (LWS) 128, Global work size (GWS) 65536 > Loaded 12906 password hashes with no different salts (Raw MD5 [OpenCL]) > end self test [...] > guesses: 0 time: 0:00:00:21 0.00% (3) c/s: 14865G trying: sl3adu - bdbmme > > Myrice's kernel is spilling into scrach registers which might be the reason > for lower performance. Most likely you had tested it with > a different driver. Another reason is that it is possible that myrice and I were using other hash counts in those tests - 1M, 10M, and perhaps a few thousands - but not 13k. It is possible that the thresholds are chosen poorly, which is seen with this hash count. Alexander
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