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Date: Thu, 28 Jun 2012 18:39:05 -0300
From: Claudio André <>
Subject: Re: sha512crypt

Em 28-06-2012 18:15, Solar Designer escreveu:
> Claudio, Lukas -
> 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

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).

> Also, luckily/surprisingly this did not "ASIC hang":
I can hang 7970 if i try to, but, i haven't seen it for a while. And 
here (when i shake the GPU), i haven't seen for long time.

> $ ../run/john -te -fo=sha512crypt-opencl -pla=1
> OpenCL platform 1: AMD Accelerated Parallel Processing, 2 device(s).
> Using device 0: Tahiti
> Building the kernel, this could take a while
> Elapsed time: 16 seconds
> Local work size (LWS) 32, global work size (GWS) 16384
> Benchmarking: sha512crypt (rounds=5000) [OpenCL]... DONE
> Raw:    5152 c/s real, 3276K c/s virtual
> For comparison, on CPU:
> $ ../run/john -te -fo=sha512crypt
> Benchmarking: sha512crypt (rounds=5000) [64/64]... (8xOMP) DONE
> Raw:    2072 c/s real, 257 c/s virtual
> (and we should be able to get almost(?) twice that by using SIMD).
> Alexander

You can double CPU speed using SIMD? Something i would like to see.


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