Learning Forum

[sophie.nicoud]

Always this message in the Fluent console :

"Software rasterizer found, hardware acceleration will be disabled...."

I understand it's mean I can't run 3D simulation. 

What's the solution, please ?

My configuration :

Linux machine ubuntu 22 Nvidia RTX4000

GPU and OS matched the requirements

Information in the console of Fluent :

CPU/Memory Usage:
---------------------------------------------------------------------------------------
                    | CPU                                  | System Mem (GB)                  
Hostname            | Sock x Core x HT  Clock (MHz) Load   | Total        Available  
---------------------------------------------------------------------------------------
xyz| 2 x 36 x 2        0           6.66   | 1007.38      995.638    
---------------------------------------------------------------------------------------
Total               | 144               -           -      | 1007.38      995.638    
---------------------------------------------------------------------------------------

CUDA visible GPUs on xyz
  CUDA runtime version 6000
  Driver version 12040
  Number of GPUs 1
    0. NVIDIA RTX 4000 Ada Generation (*)
       48 SMs
       2.175 GHz
       21.1253 GBytes

Many thanks

[randyk]

Hi sophie.nicoud,

I am assuming you are running with a remote desktop - such as VNC.

If that is accurate, please install and configure VirtualGL to do server side rendering.

1. Confirm that VirtualGL rendering is active

If you set the VGL_LOGO environment variable before starting an application, a small logo reading "VGL" will be shown in the bottom-right corner of any OpenGL scene that is rendered through VirtualGL in that application:

 

$ VGL_LOGO=1 vglrun glxgears

 

If the application runs but the logo does not appear, it means VirtualGL has failed to take effect and the application has probably fallen back to software rendering.

2. Run the Ansys application 

$ vglrun /path/v251/fluent/bin/fluent

Please let me know if this helps.

thanks
Randy

[sophie.nicoud]

Hi Randy,

Step 1 is OK. I got the logo VGL

Step 2 it's same, I got teh message ""Software rasterizer found, hardware acceleration will be disabled...." in fluent console

Thanks for your reply

Sophie

[randyk]

Hi Sophie,

Can you please share the output from:
$  vglrun glxinfo | grep -i opengl

thanks
Randy

[sophie.nicoud]

Hi,

# vglrun glxinfo | grep -i opengl
OpenGL vendor string: Mesa
OpenGL renderer string: llvmpipe (LLVM 15.0.7, 256 bits)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 23.2.1-1ubuntu3.1~22.04.3
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:

Thanks a lot

Sophie

[randyk]

llvmpipe is software rendering. The llvmpipe driver is used when the hardware graphics driver is not available or if there’s a problem with the hardware. 
You will need to resolve the driver issue.
Make sure you have the NVIDIA driver installed, xorg.conf configured, BIOS configured, etc…
I suggest a web search with keywords: llvmpipe instead nvidia gpu

[sophie.nicoud]

Hi Rand,

Apologize, it was a no configuration of BIOS.

I set "Secure boot" in the BIOS at no and it's OK (I hope)

Fluent run without error with this command : vglrun /path/fluent

xrdp or TurboVNC are fine to connect to the server if I use vglrun

Thank a lot for your help

Best regards

Sophie