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Date: Fri, 29 Jun 2012 03:22:07 +0400
From: Solar Designer <>
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?


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