From: Axel Kohlmeyer (
Date: Mon May 14 2007 - 11:04:34 CDT

On Mon, 14 May 2007, Dow Hurst DPHURST wrote:

DH> Mario,
DH> The opteron can run 32bit and 64 bit code so you may be running a 32bit
DH> nvidia driver. The itanium is not enabled the same way, IIRC. There
DH> really isn't 64bit GLSL support from Nvidia or ATI yet.

i beg to differ. see:

i'm running this on an EM64t machine (dual woodcrest) in 64-bit
mode and GLSL works nicely when running locally.

the situation is very different on IA64, but for remote display
this is not so much an issue. the question is more whether
the local nvidia driver exposes the GLSL infrastructure to a
remote application via GLX, which is a cat of a different color.


DH> Dow
DH> wrote: -----
DH> To: John Stone <>,
DH> From: Mario Valle <>
DH> Sent by:
DH> Date: 04/24/2007 11:44PM
DH> Subject: Re: vmd-l: GLSL rendering problems (??)
DH> > So, at the present time the only option is to get a 64-bit OpenGL
DH> > driver that supports GLSL. So far as I know, none of the 64-bit
DH> > drivers from any of the vendors do GLSL yet.
DH> >
DH> I disagree, the new HP SVA line (Opteron 64 bits) has GLSL support and
DH> in fact I'm running VMD with GLSL rendering without trouble. Well, as
DH> usual, it says my driver is buggy, but it works.
DH> Ciao!
DH> mario
DH> > John Stone
DH> >
DH> >
DH> > On Tue, Apr 24, 2007 at 05:00:20PM -0400, Nichols A. Romero wrote:
DH> >
DH> >> Yes, the machine that I ssh (kerborized) into is an SGI Altix. My local
DH> >> machine is a laptop, but they appear to have
DH> >> the same graphics card. In order to get GLSL rendering working on my
DH> laptop,
DH> >> I had to update the NVIDIA drivers.
DH> >>
DH> >> So, is the problem the SSH or the NVIDIA driver on the Altix?
DH> >>
DH> >> On 4/24/07, John Stone <> wrote:
DH> >>
DH> >>> Hi,
DH> >>> The output of glxinfo indicates that your driver isn't exporting
DH> >>> the GLSL extensions. In fact, the only extra features you're getting
DH> are
DH> >>> the multitexture extension and a stencil buffer. It appears that
DH> you're
DH> >>> attaching through 'ssh', guessing by your DISPLAY variable being set
DH> >>> to "localhost:10.0". That combined with the fact that you appear to be
DH> >>> remote displaying onto a remote laptop may be the reason for problems.
DH> >>> What happens when you run VMD locally on the laptop? (the machine with
DH> >>> the Quadro FX Go1400 in it, which I'm assuming is NOT the Altix...)
DH> >>>
DH> >>> Cheers,
DH> >>> John Stone
DH> >>>
DH> >>>
DH> >>> On Tue, Apr 24, 2007 at 04:40:57PM -0400, Nichols A. Romero wrote:
DH> >>>
DH> >>>> Hi,
DH> >>>>
DH> >>>> This is on SGI Altix. 16-processors box, using VMD 1.8.5 (I know that
DH> >>>>
DH> >>> need
DH> >>>
DH> >>>> to upgrade).
DH> >>>>
DH> >>>> Receiving following message on start up.
DH> >>>> Info) Multithreading available, 16 CPUs detected.
DH> >>>> Xlib: extension "XFree86-DRI" missing on display "localhost:10.0".
DH> >>>> Info) OpenGL renderer: Quadro FX Go1400/PCI/SSE2
DH> >>>> Info) Features: STENCIL MTX
DH> >>>> Info) GLSL rendering mode is NOT available.
DH> >>>> Info) Textures: 2-D (4096x4096), 3-D (512x512x512), Multitexture (4)
DH> >>>> Found 1 plugins or data handlers in directory
DH> >>>> '/usr/people/naromero/vmd-1.8.5/lib/plugins/LINUXIA64/molfile'.
DH> >>>>
DH> >>>> Is the lack of GLSL rendering a XFree86 problem or an NVIDIA driver
DH> >>>>
DH> >>> problem?
DH> >>>
DH> >>>> I attach the glxinfo output.
DH> >>>>
DH> >>>> --
DH> >>>> Nichols A. Romero, Ph.D.
DH> >>>> 1613 Denise Dr. Apt. D
DH> >>>> Forest Hill, MD 21050
DH> >>>> 443-567-8328 (C)
DH> >>>> 410-306-0709 (O)
DH> >>>>
DH> >>>
DH> >>> --
DH> >>> NIH Resource for Macromolecular Modeling and Bioinformatics
DH> >>> Beckman Institute for Advanced Science and Technology
DH> >>> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
DH> >>> Email: Phone: 217-244-3349
DH> >>> WWW: Fax: 217-244-6078
DH> >>>
DH> >>>
DH> >>
DH> >> --
DH> >> Nichols A. Romero, Ph.D.
DH> >> 1613 Denise Dr. Apt. D
DH> >> Forest Hill, MD 21050
DH> >> 443-567-8328 (C)
DH> >> 410-306-0709 (O)
DH> >>
DH> >
DH> >
DH> --
DH> Ing. Mario Valle
DH> Visualization Group |
DH> Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60
DH> v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82

Axel Kohlmeyer
   Center for Molecular Modeling   --   University of Pennsylvania
Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
tel: 1-215-898-1582,  fax: 1-215-573-6233,  office-tel: 1-215-898-5425
If you make something idiot-proof, the universe creates a better idiot.