[Paraview] [EXT] Re: v5.0.1 & RealVNC

Thu Apr 14 07:53:32 EDT 2016

Chuck & Utkarsh,

Well, this is good news, at least we know what is going on.

I tried paraview –mesa-llvm  and got error that libatomic.so.1 is missing

So, what is the minimum required version of OpenGL required for Paraview5?

At this point, since we have a support contract with realVNC, we will go back to them with your 2 options, but specifying what version of OpenGL is required and then see what they can do.

Thanks very much,  I believe with this 1 additional fact we can chart a path forward with realVNC.

As far as the distro – we are on SUSE, but are migrating to RedHat very soon.

Dennis

From: Chuck Atkins [mailto:chuck.atkins at kitware.com]
Sent: Wednesday, April 13, 2016 2:38 PM
To: Utkarsh Ayachit <utkarsh.ayachit at kitware.com>
Cc: Dennis Conklin <dennis_conklin at goodyear.com>; ParaView Mailing List <paraview at paraview.org>
Subject: Re: [Paraview] [EXT] Re: v5.0.1 & RealVNC

Hi Dennis,

Xlib:  extension "NV-GLX" missing on display "alnx031:15.0".
OpenGL vendor string: Mesa project: www.mesa3d.org<http://www.mesa3d.org>
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 (1.5 Mesa 6.4.1)
OpenGL extensions:

As I suspected, this is telling us is that the VNC server does not have access to the GPU on the machine it's running on and is falling back to the Mesa software driver, which does not support the version of OpenGL that ParaView requires.  Older versions of ParaView (4.x) used a much older OpenGL stack while the newer 5.x releases have a completely overhauled rendering backend but it requires support for newer OpenGL versions. So, even though older ParaView versions worked, they still were not able to use the GPU and likely had fairly poor performance.  Given that, there are 2 options:

  *   Ideal:

     *   See if your sysadmins can "fix" or configure the VNC server on the workstation to work with the GPU.

  *   Workable:

     *   Run ParaView using a newer version of Mesa.

        *   You can probably use the binaries packaged with Paraview as Utkarsh mentioned by adding --mesa-llvm.
        *   If this doesn't work, the mesa binaries we ship with ParaView are probably incompatible with the Linux distro the server runs.  Which distro does the server run?  We may have a new version already built that you can try to use.
        *   Not ideal since it's still using software rendering but better than nothing if your admins can't get the VNC server working with the GPU.
- Chuck

- Chuck

On Wed, Apr 13, 2016 at 2:19 PM, Utkarsh Ayachit <utkarsh.ayachit at kitware.com<mailto:utkarsh.ayachit at kitware.com>> wrote:
Dennis,

Don't mean to distract this conversation -- I'll let Chuck follow  up
on the VNC thing -- but a a small sidetrack:

Can you trying running paraview as:

> paraview --mesa-llvm

Does that work?

Utkarsh

On Wed, Apr 13, 2016 at 12:12 PM, Dennis Conklin
<dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>> wrote:
> Chuck,
>
>
>
> This is what I get – none of this means anything to me!
>
>
>
> Dennis
>
>
>
>
>
> Xlib:  extension "NV-GLX" missing on display "alnx031:15.0".
>
> OpenGL vendor string: Mesa project: www.mesa3d.org<http://www.mesa3d.org>
>
> OpenGL renderer string: Mesa GLX Indirect
>
> OpenGL version string: 1.2 (1.5 Mesa 6.4.1)
>
> OpenGL extensions:
>
>
>
> From: Chuck Atkins [mailto:chuck.atkins at kitware.com<mailto:chuck.atkins at kitware.com>]
> Sent: Wednesday, April 13, 2016 11:56 AM
> To: Dennis Conklin <dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>>
> Cc: ParaView Mailing List <paraview at paraview.org<mailto:paraview at paraview.org>>
> Subject: Re: [EXT] Re: [Paraview] v5.0.1 & RealVNC
>
>
>
> Hi Dennis,
>
> I suspect the GPU is not getting used by the VNC server and thus falling
> back to a software OpenGL implementation with older mesa and not a new
> enough OpenGL support.  Different VNC servers on Linux have different
> capabilities, with some able to reach their underlying GPU and some not.
> From your VNC session, can you open up a terminal and run: glxinfo | grep
> '^OpenGL' ?  That should be more telling.
>
>
> - Chuck
>
>
>
> On Wed, Apr 13, 2016 at 9:58 AM, Dennis Conklin
> <dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>> wrote:
>
> Chuck,
>
>
>
> Sorry, got additional details from the sysops.
>
>
>
> We have GPUs in our workstations – he was referring that we don’t have GPU
> clusters for computation.    I understand that the VNC server is running on
> the workstation that I attach to, and yes, we are using the GPU on that
> workstation to render.
>
>
>
> FYI,  the workstations have Nvidia K4000 cards and we are running realVNC –
> any chance this is part of your test suite?
>
>
>
> Thanks again, sorry for the confusion, but I am NOT a Linux or VNC guru!!
>
>
>
> Dennis
>
>
>
> From: Chuck Atkins [mailto:chuck.atkins at kitware.com<mailto:chuck.atkins at kitware.com>]
> Sent: Tuesday, April 12, 2016 6:05 PM
> To: Dennis Conklin <dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>>
> Cc: ParaView Mailing List <paraview at paraview.org<mailto:paraview at paraview.org>>
> Subject: [EXT] Re: [Paraview] v5.0.1 & RealVNC
>
>
>
> Sorry, forgot to cc the list.
>
> Hi Dennis, a few questions:
>
> Are you using the binaries from paraview.org<http://paraview.org> or did you build it yourself?
> Does the machine with the vnc server have a GPU you're trying use?
> You said previous versions of paraview worked.  Does that include 5.0 and
> 4.x or just 4.x?
>
> On Apr 12, 2016 4:04 PM, "Dennis Conklin" <dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>>
> wrote:
>
> All,
>
>
>
> So I started testing Paraview v5.0.1 Linux and it doesn’t work with RealVNC
> v4, or v5.1.1 or v5.3 (dies with Segmentation fault without even displaying
> a screen).   Earlier versions of Paraview work but not 5.0.1.  I am not very
> familiar with VNC.   Are there graphics or other options in VNC that need to
> be tuned that I could refer to my sysops?
>
>
>
> Thanks for any hints.
>
>
>
> Dennis
>
>
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