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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