Re: Controlling fans on a GTX 560 ti

From: Axel Kohlmeyer (
Date: Mon Jan 16 2012 - 19:29:26 CST


its been a long time coming, but i finally found a need
to start updating out GPU nodes to CUDA 4.x (4.1rc2 right now)
and also updated the gpu far control hack for headless
compute nodes running nvidia GPUs (i have a version
for AMD ones, too, btw), since we have started testing
and tuning the OpenCL accelerated multi-GPU support
in LAMMPS on AMD hardware, too.

as i suspected, the persistence mode setting is required
to achieve the same effect as with the logger feature before.

please find the updated script attached.


On Fri, Jul 22, 2011 at 10:19 AM, Axel Kohlmeyer <> wrote:
> On Fri, Jul 22, 2011 at 10:12 AM, Ajasja Ljubetič
> <> wrote:
>>> as of recent, nvidia seems to have made
>>> it a policy to make it harder to use consumer grade hardware
>>> for GPU computing by dropping access to helpful features that
>>> used to be (semi-)supported.
>> Yes, sadly I noticed. Quad buffering is not supported on the GTX line
>> either, but requires the Quadro line.
> that is something else. this distinction has always been the case.
> the change i was commenting on has been an arbitrary and recent
> one and particularly comes after a long time of advertising that
> _all_ nvidia gpus offered are capable for GPU computing.
>> Still, setting fan speed in windows does not seem to be a problem, so there
>> is still hope.
>> Could you comment on what "nvidia-smi -d -l -i 900" was supposed to do?
> it is supposed to emulate what is now called "persistence mode".
> normally GPU settings (like fan speed control) persist only until
> the driver is re-initialized. with a headless GPU server, this would
> happen _every_ time a new GPU application starts. in order to
> keep the GPU driver from re-initializing the GPUs, one has to keep
> a context open. in a desktop environment that would be the X server.
> for a headless workstation one needs something else. this command
> serves the purpose and does (almost) nothing.
> cheers,
>     axel.
>> Thank you & best regards,
>> Ajasja
> --
> Dr. Axel Kohlmeyer
> Institute for Computational Molecular Science
> Temple University, Philadelphia PA, USA.

Dr. Axel Kohlmeyer
College of Science and Technology
Temple University, Philadelphia PA, USA.

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