Compiling OpenGL/ NVidia CUDA-based applications on Debian Linux
The Debian platform managed by ISG.EE uses the following directory layout for the OpenGL libraries and headers:
The /usr/lib/x86_64-linux-gnu/libGL*.so OpenGL libraries are symbolic links to the hardware-specific libraries. There is a mechanism in the startup process of each client workstation which detects the accurate OpenGL library based on the information about the graphics card and the kernel driver. The CUDA runtime libraries are found in the same directory.
OpenGL header files
The OpenGL headers are found under /usr/include/GL.
CUDA header files
For NVidia programming, a CUDA toolkit matching the installed NVidia driver is selected when a toolkit program like nvccis run.
Any CUDA headers have to bee included by manually matching the toolkit version used. Check the content of the SEPP package cuda_toolkit-1x.x-sr for available versions by listing its contents with ls /usr/pack/cuda_toolkit-1x.x-sr
Usually, there is a lower driver/toolkit version combo for desktop PCs and a higher version combo for Slurm GPU nodes:
For desktop PCs: driver version 418 works with toolkit version 10.1.243
For Slurm GPU nodes: driver version 460 works with toolkit version 11.2.2
The following environment variables have to be set with the correct driver or toolkit version:
export CPPFLAGS='-I/usr/pack/cuda_toolkit-1x.x-sr/<driver or toolkit version>/include'` export LDFLAGS='-L/usr/pack/cuda_toolkit-1x.x-sr/<driver or toolkit version>/lib64 -Wl,-rpath,/usr/pack/cuda_toolkit-1x.x-sr/<driver or toolkit version>/lib64' `
Compiling sources and linking against NVidia libraries
Make sure no special CPPFLAGS and LDFLAGS are set. The required headers and libraries are all found under the standard system paths. If you use your own OpenGL/ CUDA toolkit, e.g. installed in your home, make sure it is compatible with the graphics driver/ hardware installed on the system. Note: if you don't have brand new hardware in your computer, the most current CUDA release most probably won't work with it - use an older relase or ask ISG.EE if you are in doubt about the right version.
Then set CPPFLAGS (for the C preprocessor used by most compilers) and LDFLAGS (linker flags) as follows:
Assuming you installed the toolkit under /home/$USER/toolkit you set the mentioned environment variables in your Debian shell (bash, tcsh, ...) as follows, before you start compiling/ linking:
export CPPFLAGS="-I/home/$USER/toolkit/include" export LDFLAGS="-L/home/$USER/toolkit/lib -Wl,-rpath,/home/$USER/toolkit/lib"
$USER must of course be replaced with your ETH (login-)username.