Date: Fri, 29 Jun 2012 03:22:07 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: sha512crypt On Thu, Jun 28, 2012 at 06:39:05PM -0300, Claudio Andr? wrote: > Em 28-06-2012 18:15, Solar Designer escreveu: > >Why doesn't this give the 11500 c/s speed on bull as mentioned before? - > You have to select better than my safe defaults. I recommend: > > LWS=512 GWS=7680 ../run/john -te -fo=sha512crypt-opencl OK, this works: $ LWS=512 GWS=7680 ../run/john -te -fo=sha512crypt-opencl OpenCL platform 0: NVIDIA CUDA, 1 device(s). Using device 0: GeForce GTX 570 Building the kernel, this could take a while Local work size (LWS) 512, global work size (GWS) 7680 Benchmarking: sha512crypt (rounds=5000) [OpenCL]... DONE Raw: 11349 c/s real, 11349 c/s virtual > BTW: sane defaults are a good improvement, but, at least on AMD, it is a > little bit tricky (i mean, there are a lot of good LWS/GWS that hang > 7970, using the same source code). Maybe you could have the code check for Nvidia vs. AMD and try more aggressive defaults on Nvidia? Alexander
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