VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Thu Oct 23 2014 - 12:34:44 CDT

Hi,
  I wonder if the file permissions on the GPU device nodes
are set such that they are not necessarily accessible if you're not
logged into the console? What are the permissions on the
/dev/nvidia* devices?:

% ls -al /dev/nvidia*
crw-rw-rw- 1 root root 195, 0 Oct 23 11:51 /dev/nvidia0
crw-rw-rw- 1 root root 195, 1 Oct 23 11:51 /dev/nvidia1
crw-rw-rw- 1 root root 195, 2 Oct 23 11:51 /dev/nvidia2
crw-rw-rw- 1 root root 195, 255 Oct 23 11:51 /dev/nvidiactl
crw-rw-rw- 1 root root 252, 0 Oct 23 12:05 /dev/nvidia-uvm

Cheers,
  John

On Thu, Oct 23, 2014 at 11:15:25AM -0500, Maxim Belkin wrote:
> I did a quick test: I get an error (different one, pasted below) when I use OptiX over ssh on a machine where I'm not logged in to an X11 windowing system. If I am, however, OptiX over ssh works fine.
>
> Info) VMD for LINUXAMD64, version 1.9.2beta2optixtest1 (October 11, 2014)
> Info) http://www.ks.uiuc.edu/Research/vmd/
> Info) Email questions and bug reports to vmd_at_ks.uiuc.edu
> Info) Please include this reference in published work using VMD:
> Info) Humphrey, W., Dalke, A. and Schulten, K., `VMD - Visual
> Info) Molecular Dynamics', J. Molec. Graphics 1996, 14.1, 33-38.
> Info) -------------------------------------------------------------
> Info) Multithreading available, 16 CPUs detected.
> Info) Free system memory: 53302MB (82%)
> Info) Creating CUDA device pool and initializing hardware...
> Info) Detected 1 available CUDA accelerator:
> Info) [0] GeForce GTX 770 8 SM_3.0 @ 1.08 GHz, 2.0GB RAM, KTO, AE1, ZCP
> Info) Detected 1 available TachyonL/OptiX ray tracing accelerator
> Info) OpenGL renderer: NVIDIA GeForce GT 330M OpenGL Engine
> Info) Features: STENCIL MSAA(4) MDE MTX NPOT PP PS
> Info) GLSL rendering mode is NOT available.
> Info) Textures: 2-D (8192x8192), 3-D (2048x2048x2048), Multitexture (8)
> Info) Dynamically loaded 2 plugins in directory:
> Info) /home/mbelkin/lib_vmd/vmd/plugins/LINUXAMD64/molfile
> ....
> Info) Ambient occlusion enabled.
> Info) Shadow rendering enabled.
> ERROR) OptiX error: Invalid context (Details: Function "RTresult _rtContextCompile(RTcontext)" caught exception: Unable to set the CUDA device., [3735714]) (OptiXRenderer.C:986
> OptiXRenderer) An error occured compiling the context. Rendering is aborted.
>
>
>
> > On Oct 23, 2014, at 10:48 AM, Norman Geist <norman.geist_at_uni-greifswald.de> wrote:
> >
> > Hi John,
> >
> > Yes, using it locally works fine, here the output:
> >
> > Local:
> >
> > Info) VMD for LINUXAMD64, version 1.9.2beta1 (September 12, 2014)
> > Info) http://www.ks.uiuc.edu/Research/vmd/
> > Info) Email questions and bug reports to vmd_at_ks.uiuc.edu
> > Info) Please include this reference in published work using VMD:
> > Info) Humphrey, W., Dalke, A. and Schulten, K., `VMD - Visual
> > Info) Molecular Dynamics', J. Molec. Graphics 1996, 14.1, 33-38.
> > Info) -------------------------------------------------------------
> > Info) Multithreading available, 64 CPUs detected.
> > Info) Free system memory: 117456MB (90%)
> > Info) Creating CUDA device pool and initializing hardware...
> > Info) Detected 1 available CUDA accelerator:
> > Info) [0] GeForce GTX 660 5 SM_3.0 @ 1.03 GHz, 2.0GB RAM, KTO, AE1, ZCP
> > Info) Detected 1 available TachyonL/OptiX ray tracing accelerator
> > Warning) Detected X11 'Composite' extension: if incorrect display occurs
> > Warning) try disabling this X server option. Most OpenGL drivers
> > Warning) disable stereoscopic display when 'Composite' is enabled.
> > Info) OpenGL renderer: GeForce GTX 660/PCIe/SSE2
> > Info) Features: STENCIL MSAA(4) MDE CVA MTX NPOT PP PS GLSL(OVFGS)
> > Info) Full GLSL rendering mode is available.
> > Info) Textures: 2-D (16384x16384), 3-D (2048x2048x2048), Multitexture (4)
> > Info) Dynamically loaded 2 plugins in directory:
> > Info) /alfred/bin/vmd/vmd-1.9.2b1/plugins/LINUXAMD64/molfile
> > after#0
> > vmd >
> > [...]
> > vmd > Info) Rendering current scene to 'vmdscene.ppm' ...
> > Total OptiX rendering time: 0.9 sec
> > Info) Executing post-render cmd 'display vmdscene.ppm' ...
> >
> > SSH Forwarded:
> >
> > Info) VMD for LINUXAMD64, version 1.9.2beta1 (September 12, 2014)
> > Info) http://www.ks.uiuc.edu/Research/vmd/
> > Info) Email questions and bug reports to vmd_at_ks.uiuc.edu
> > Info) Please include this reference in published work using VMD:
> > Info) Humphrey, W., Dalke, A. and Schulten, K., `VMD - Visual
> > Info) Molecular Dynamics', J. Molec. Graphics 1996, 14.1, 33-38.
> > Info) -------------------------------------------------------------
> > Info) Multithreading available, 64 CPUs detected.
> > Info) Free system memory: 117364MB (90%)
> > Info) Creating CUDA device pool and initializing hardware...
> > Info) Detected 1 available CUDA accelerator:
> > Info) [0] GeForce GTX 660 5 SM_3.0 @ 1.03 GHz, 2.0GB RAM, KTO, AE1, ZCP
> > Info) Detected 1 available TachyonL/OptiX ray tracing accelerator
> > Warning) Detected X11 'Composite' extension: if incorrect display occurs
> > Warning) try disabling this X server option. Most OpenGL drivers
> > Warning) disable stereoscopic display when 'Composite' is enabled.
> > Info) OpenGL renderer: GeForce GTX 660/PCIe/SSE2
> > Info) Features: STENCIL MSAA(4) MDE MTX NPOT PP PS GLSL(OVFG)
> > Info) Full GLSL rendering mode is available.
> > Info) Textures: 2-D (16384x16384), 3-D (2048x2048x2048), Multitexture (4)
> > Info) Dynamically loaded 2 plugins in directory:
> > Info) /alfred/bin/vmd/vmd-1.9.2b1/plugins/LINUXAMD64/molfile
> > after#0
> > vmd >
> > [...]
> > Info) Rendering current scene to 'vmdscene.ppm' ...
> > ERROR) OptiX error: Unknown error (Details: Function "RTresult
> > _rtContextLaunch2D(RTcontext, unsigned int, RTsize, RTsize)" caught
> > exception: Encountered a CUDA error: cuGLGetDevices() returned (201):
> > Invalid context, [3801520]) (OptiXRenderer.C:1002
> > OptiX: An error occured in AS generation. Rendering is aborted.
> > Total OptiX rendering time: 0.8 sec
> > Info) Executing post-render cmd 'display vmdscene.ppm' ...
> > display: improper image header `vmdscene.ppm' @
> > error/pnm.c/ReadPNMImage/295.
> >
> >
> > Norman Geist.
> >
> >> -----Ursprüngliche Nachricht-----
> >> Von: John Stone [mailto:johns_at_ks.uiuc.edu]
> >> Gesendet: Donnerstag, 23. Oktober 2014 17:30
> >> An: Norman Geist
> >> Cc: VMD Mailing List
> >> Betreff: Re: vmd-l: Tachyon-Optix failure when SSH X11
> >>
> >> Norman,
> >> Do you get a particular error message? I wouldn't expect it to
> >> matter
> >> if you're redirecting X to a remote display, at least in the OptiX code
> >> paths I'm actually using. I have run OptiX renderings with no display,
> >> e.g. with VMD using "-dispdev text" without any problems, so I'm
> >> puzzled
> >> why the remote display would matter. When you're remote displaying,
> >> does
> >> VMD identify the CUDA devices in the machine correctly? I assume you
> >> have
> >> also tested this same machine and when running to a local display it
> >> works fine?
> >>
> >> Cheers,
> >> John Stone
> >> vmd_at_ks.uiuc.edu
> >>
> >> On Thu, Oct 23, 2014 at 05:01:31PM +0200, Norman Geist wrote:
> >>> Just want to report that using the Tachyon Optix Renderer doesn't
> >> work
> >>> when redirected over SSH.
> >>>
> >>> - cheers -
> >>>
> >>>
> >>>
> >>> Norman Geist
> >>>
> >>> ------------------------------------------------------------------
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> >> --
> >> NIH Center for Macromolecular Modeling and Bioinformatics
> >> Beckman Institute for Advanced Science and Technology
> >> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> >> http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
> >> http://www.ks.uiuc.edu/Research/vmd/
> >
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-- 
NIH Center for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
http://www.ks.uiuc.edu/~johns/           Phone: 217-244-3349
http://www.ks.uiuc.edu/Research/vmd/