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Date: Wed, 3 Jul 2013 00:16:44 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: bug: GPU use in CPU-only formats
On Tue, Jul 02, 2013 at 08:47:27PM +0400, Solar Designer wrote:
> On Tue, Jul 02, 2013 at 11:53:31AM -0300, Claudio Andr? wrote:
> > BUT: no real GPU memory allocation is done inside common code. Neither
> > code execution. So, ghosts and busy devices could not happen.
>
> Somehow the NVIDIA card and the PSU actually get hotter because of this;
> I wonder what's going on in there if not code execution. I think it's
> at least 100W extra (roughly half-load on the card), compared to running
> a CPU-only build with the same format.
Here's a guess: it's clock rate increase. Normally, the GPU idles at a
much reduced clock rate, but after OpenCL initialization it's probably
idling (executing some idle loop?) at the full clock rate.
Alexander
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