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Date: Sat, 19 Jan 2013 19:35:03 +0530
From: Sayantan Datta <>
Subject: Re: Mulit-gpu using claudio's interfaces

> On Sat, Jan 19, 2013 at 3:25 PM, magnum <> wrote:

> ../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

Ideally,it shouldn't segfault. I'll look into it. One problem could be that
the work size assigned to cpu is evaluating to zero.

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

Hashcat does 107.2K with reference 7970. So I think the speed is OK.

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