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Date: Sat, 19 Jan 2013 10:55:23 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Mulit-gpu using claudio's interfaces

On 19 Jan, 2013, at 9:04 , Sayantan Datta <std2048@...il.com> wrote:

> I have integrated the claudio's interfaces in mscash2-opencl:
> 
> std2048@...l:~/Jtr3/run$ ./john -te -fo=mscash2-opencl -dev=0,1
> Device 0: GeForce GTX 570 
> Optimal Work Group Size:256
> Kernel Execution Speed (Higher is better):0.475557
> Device 1: Tahiti (AMD Radeon HD 7900 Series)
> Optimal Work Group Size:128
> Kernel Execution Speed (Higher is better):1.556817
> Benchmarking: M$ Cache Hash 2 (DCC2) PBKDF2-HMAC-SHA-1 [OpenCL]... DONE
> Raw:    125427 c/s real, 125427 c/s virtual
> 
> std2048@...l:~/Jtr3/run$ ./john -te -fo=mscash2-opencl -dev=gpu
> Device 0: GeForce GTX 570 
> Optimal Work Group Size:128
> Kernel Execution Speed (Higher is better):0.474687
> Device 1: Tahiti (AMD Radeon HD 7900 Series)
> Optimal Work Group Size:128
> Kernel Execution Speed (Higher is better):1.557031
> Benchmarking: M$ Cache Hash 2 (DCC2) PBKDF2-HMAC-SHA-1 [OpenCL]... DONE
> Raw:    126030 c/s real, 125728 c/s virtual

Good stuff. Ideally we should have a GTX 590 or GTX 690 and an AMD 7990 in Bull so we could test multi-device CUDA as well as multi-device OpenCL with homogenous or heterogenous devices.

I'm not sure about iterations and key length, but shouldn't mscash2 ideally perform similar or better than wpapsk?

Also, there's some problem using three devices:

../run/john -t -fo:mscash2-opencl --dev=all
Device 0: GeForce GTX 570 
Optimal Work Group Size:128
Kernel Execution Speed (Higher is better):0.474681
Device 1: Tahiti (AMD Radeon HD 7900 Series)
Optimal Work Group Size:256
Kernel Execution Speed (Higher is better):1.556828
Device 2: AMD FX(tm)-8120 Eight-Core Processor            
Optimal Work Group Size:4
Kernel Execution Speed (Higher is better):0.001337
Benchmarking: M$ Cache Hash 2 (DCC2) PBKDF2-HMAC-SHA-1 [OpenCL]... Segmentation fault

Maybe they are just too different in speed.

magnum

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