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Date: Sat, 17 Nov 2012 10:13:19 +0100
From: Marc Brinkmann <>
Subject: Re: scalar mode

I',m sorry, but it did not help in my case :(
i tried sabayon with recent catalyst 12.10 and my ubuntu 12.04 with
catalyst 12.8 and the very recent 12.11 beta8
none of them were working, but 12.11beta even did not work with the version
<= 13.11.2012
I guess its AMD's damn driver and will simply use the old build with
catalyst 12.8.

Btw. while i tested your recent builds on my Netbook running ION i never
had any issues, so Nvidia drivers seem to be much more stable ....
Of course it is slow 120c/s.. but i never runs into segfault...

2012/11/16 magnum <>

> On 16 Nov, 2012, at 23:10 , magnum <> wrote:
> > Try latest commit. The office2007/2010/2013 and ntlmv2 OpenCL formats
> will now default to scalar mode on any device, including CPU. You can now
> add --request-vectorize to your command line and see if vectorizing
> triggers the bug, or if it gets faster or slower. Office actually gets a
> tad faster on some nvidias, I've never seen that before.
> Correction: It is ntlmv2 that gets faster vectorized on some nvidias. And
> only the "one salt" case (the opposite would seem more natural to me as
> we're memory bound).
> Vectorizing the Office formats are very bad for nvidia but has shown some
> 40% boost on Cayman.
> CPUs should benefit from vectorizing but I have seen huge regressions in
> some cases and great speedups in other cases. Maybe the ideal would be to
> decide at runtime after a quick benchmark. I'm not feeling very inspired
> right now though. Damn drivers :-(
> magnum

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