Re: [AMBER-Developers] beta of pmemd.cuda.MPI available in git tree

From: Ross Walker <>
Date: Mon, 23 Aug 2010 13:12:39 -0700

Hi Dave,

I'm sitting here with Scott Le Grand and neither of us can work out what is
wrong here. Seems very strange since you have the latest driver and the
latest cuda toolkit.

Our only guess is that either the card is stuck in a really weird state or
for some reason the driver is not being loaded.

Double check /etc/X11/xorg.conf (or the equivalent depending on your Linux
Install) and look for the device sections:

Section "Device"
    Identifier "Videocard0"
    Driver "nvidia"
    VendorName "Videocard vendor"
    BoardName "VESA driver (generic)"

Make sure under Driver is says "nvidia" and NOT "nv" which would use the
default Linux driver. The Nvidia driver installer should have updated this
for you automatically but it may have not worked.

The other thing would be to shutdown the machine and have it physically
power off and back on. This will get the cards out of any weird crashed
state they may have got themselves into.

All the best

> -----Original Message-----
> From: case []
> Sent: Monday, August 23, 2010 12:49 PM
> To: AMBER Developers Mailing List
> Subject: Re: [AMBER-Developers] beta of pmemd.cuda.MPI available in git
> tree
> On Mon, Aug 23, 2010, Ross Walker wrote:
> >
> > init 5
> No change in behavior.
> >
> >
> >
> Can you tell me which drivers you are using? The SDK above says to use
> version 195.x, but I have version 256.44 (which is the latest at the
> nvidia
> web site). Is there a difference between a "Linux display driver" and
> a
> "Linux x86_64 display driver".?
> I ask because the SDK deviceQuery command returns this:
> ./deviceQuery Starting...
> CUDA Device Query (Runtime API) version (CUDART static linking)
> cudaGetDeviceCount FAILED CUDA Driver and Runtime version may be
> mismatched.
> >
> > You might also be able to do 'insmod nvidia' if 'lsmod' does not show
> it
> > loaded.
> "lsmod" doesn't show anything related to nvidia. But I don't
> understand
> linux modules, so I don't know how to use insmod: "/sbin/insmod nvidia"
> just returns "nvidia: no such file or directory".
> ...thx...dac
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Received on Mon Aug 23 2010 - 13:30:06 PDT
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