Re: [AMBER-Developers] weird behavior for pmemd.cuda on Volta cards

From: Daniel Roe <>
Date: Fri, 8 Dec 2017 14:14:58 -0500

On Fri, Dec 8, 2017 at 12:42 PM, David Cerutti <> wrote:
> I've asked Ke Li at NVIDIA if he has any thoughts--personally my hypothesis
> is that the cards have an on-board temperature sensor and if they get too
> hot they throttle back the cycle frequency to manage power output. In our
> passively cooled system, we may just not have the right fan configuration
> to keep the card running at full speed for very long.

One simple way to test this is when you notice the slowdown run
'nvidia-smi' and note the performance state. If it's anything but P0
you're being throttled. I believe this can also happen due to too much
power consumption.


Daniel R. Roe
Laboratory of Computational Biology
National Institutes of Health, NHLBI
5635 Fishers Ln, Rm T900
Rockville MD, 20852
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Received on Fri Dec 08 2017 - 11:30:02 PST
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