[Paraview] Cron job and ParaView

[Moreland, Kenneth]

That is basically the difference. To use any implementation of OpenGL (which is what Mesa3D is), you first need an OpenGL context. On *nix you typically get this by opening a window with the Xhost. Even when doing offscreen rendering you need to get a context with the Xhost (because classically this was the interface to the graphics hardware).

Osmesa is a small library that sits on top of Mesa3D. It creates an OpenGL context without having to go to an Xhost. It has a different interface than GLX, so your software needs to specifically open an osmesa “window” in addition to linking to the correct library.

As I recall, in order to use osmesa, you need to set VTK_OPENGL_HAS_OSMESA to ON and then set OSMESA_INCLUDE_DIR and OSMESA_LIBRARY. Typically the osmesa headers and libraries are in the same location as the Mesa 3D install.

See this Wiki page for more info: http://www.paraview.org/Wiki/ParaView_And_Mesa_3D

-Ken


From: Walter Scott <wascott at sandia.gov>
Date: Monday, May 2, 2016 at 3:11 PM
To: Kenneth Moreland <kmorel at sandia.gov>, "paraview at paraview.org" <paraview at paraview.org>
Subject: RE: [Paraview] Cron job and ParaView

OK, taking small steps here,  what is OSMesa, and want is Mesa?  Utkarsh and I had this discussion, but I never understood the difference.

Having just googled the difference, If I understand correctly, OSMesa actually means Off Screen Mesa, and is compiled into Mesa.  Otherwise, you get Mesa – software rendering, but into a GLX window?

You are correct – I am not building OSMesa.  Thus, my problem?

Alan



From: Moreland, Kenneth
Sent: Monday, May 02, 2016 3:01 PM
To: Scott, W Alan <wascott at sandia.gov>; paraview at paraview.org
Subject: Re: [Paraview] Cron job and ParaView

Are you sure you are building with osmesa? Just using mesa is not sufficient.

-Ken

From: ParaView <paraview-bounces at paraview.org<mailto:paraview-bounces at paraview.org>> on behalf of Walter Scott <wascott at sandia.gov<mailto:wascott at sandia.gov>>
Date: Monday, May 2, 2016 at 2:58 PM
To: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] Cron job and ParaView

I have a user that is trying to run ParaView in a cron job, and keeps getting the following error on PV 4.4.0: 4.4.0/ParaView4/VTK/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx, line 542 vtkXOpenGLRenderWindow (0x5197850): bad X server connection

Has anyone tried to do this, and figured out a solution?  User has tried running a build I did – which attaches to Mesa – and has –use-offscreen-rendering turned on, and is running pvbatch.  Same error.

Any ideas?

Thanks,

Alan


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