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Date: Fri, 14 Sep 2012 19:58:55 +0530
From: Dhiru Kholia <dhiru.kholia@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: office-opencl

On Fri, Sep 14, 2012 at 2:07 AM, magnum <john.magnum@...hmail.com> wrote:
> I have committed a first version of office-opencl format. For now, it only supports Office 2007 documents, and a max plaintext length of 19. I could re-use my SHA-1 from RAR, and the iterations are MUCH more GPU-friendly here:
>
> Using device 0: GeForce GTX 570
> Benchmarking: Office 2007 SHA-1 AES [OpenCL]... DONE
> Raw:    12136 c/s real, 12136 c/s virtual
>
> Using device 0: Tahiti
> Benchmarking: Office 2007 SHA-1 AES [OpenCL]... DONE
> Raw:    40832 c/s real, 748982 c/s virtual

Speed on AMD 6970,

✗ ../run/john -fo:office-opencl -t
OpenCL platform 0: AMD Accelerated Parallel Processing, 2 device(s).
Using device 0: Cayman
Optimal keys per crypt 65536
(to avoid this test on next run, put "office_GWS = 65536" in
john.conf, section [Options:OpenCL])
Local worksize (LWS) 64, Global worksize (GWS) 65536
Benchmarking: Office 2007 SHA-1 AES [OpenCL]... DONE
Raw:	16591 c/s real, 595781 c/s virtual

> 150X speedup. Awesome!

It does take a while to complete (3 to 4 minutes) and X becomes
unresponsive. Can this be fixed easily?

-- 
Cheers,
Dhiru

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