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Message-ID: <20130702165257.GC29097@openwall.com>
Date: Tue, 2 Jul 2013 20:52:57 +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 05:44:16PM +0200, magnum wrote:
> I'm not so sure they really do. Might be a driver quirk. I can reproduce it like this:
>
> screen 1$ nvidia-smi
> (get baseline)
>
> screen 0$ ../run/john -t=10 -form:raw-sha256-ng
> screen 1$ nvidia-smi
> (64 MB memory is allocated, temp/fans increase a little)
Yeah. And the temp/fan speed will increase further if you keep this
running for longer, stabilizing at about 62C and 50%. I think this is
roughly half-load. At full load, the card gets to e.g. 82C and 80%.
Run several CPU-only john processes from an -opencl build
simultaneously, and the memory usage on the NVIDIA card will increase
further (approx. 60 MB per john process).
> The temp increase (a few degrees) may actually be due to CPU heat, right?
It could have been, but I am convinced that it mostly is not. The
NVIDIA card itself does emit hot air under such conditions.
> What would be the equivalence of nvidia-smi for AMD?
user@...l:~$ DISPLAY=:0 aticonfig --odgt
Default Adapter - AMD Radeon HD 7900 Series
Sensor 0: Temperature - 47.00 C
user@...l:~$ DISPLAY=:0 aticonfig --pplib-cmd 'get fanspeed 0'
Fan speed query:
Query Index: 0, Speed in percent
Result: Fan Speed: 20%
user@...l:~$ DISPLAY=:0 aticonfig --odgc
Default Adapter - AMD Radeon HD 7900 Series
Core (MHz) Memory (MHz)
Current Clocks : 300 150
Current Peak : 925 1375
Configurable Peak Range : [300-1125] [150-1575]
GPU load : 0%
I don't know how to retrieve the memory usage, though.
Alexander
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