CUDALink not working on Linux-64 and Asus GTX460

Question

On my hardware I have a CUDA enabled video card an ASUS GTX460, yet Mathematica does not seem to recognize this.

I have:

• CUDA Toolkit 4.1
• CUDA SDK 4.0
• NVIDIA Driver 295.49

on Sabayon Linux 64 bit with Mathematica 8.0.0.

For example, following the CUDALink Setup, I get

Needs["CUDALink`"]
CUDAQ[](* False *)
CUDADriverVersion[] (* CUDADriverVersion::nodriv message raised. *)

The NVIDIA command /opt/cuda/sdk/C/bin/linux/release/deviceQuery finds the card and reports "passed" as well as listing the card capabilities.

Examples from /opt/cuda/sdk/C/bin/linux/release directory, such as smokeParticles, scan, randomFog, run well.

The relevant shell variables are set as follows:

export CUDA_LIBRARY_PATH=/usr/lib64/libcuda.so

export NVIDIA_DRIVER_LIBRARY_PATH=/usr/lib64/opengl/nvidia/lib/libnvidia-tls.so.*

Additional Information

Supported Hardware

The Wolfram CUDA reference page CUDA Reference does not explicitly list the GTX 460 GPU. It does list the GTX 460M, the mobile version, and a mysterious GTS 460.

The Wolfram linked NVIDIA CUDA GPUs lists the popular GTX 460 but has no entry at all for the GTS 460. Perhaps this is a typo in the Wolfram documentation, as it would seem unlikely that they wouldn't support a commonplace NVIDIA GPU whilst supporting a seemingly non-existent GPU. If this isn't the case - I'm clearly stuck.

Problems finding the NVIDIA driver

Some poking around suggests that one sticking point is that

GPUTools`Internal`$NVIDIADriverLibraryVersion

is set to $Failed.

Would anyone know where this is set? From trying to Trace CUDADriverVersion it isn't obvious to me where things go wrong.

How do I convince Mathematica that my card supports CUDA?

Answer 1

Try setting your shell variable to

NVIDIA_DRIVER_LIBRARY_PATH=/usr/lib64/opengl/nvidia/lib/libnvidia-tls.so

i.e. point it to a specific library.

Answer 2

I have managed to get CUDALink working on an ubuntu 14.04 with an NVidia GTX 750 Ti with CUDA 7 toolkit (installed the toolkit following these instructions; http://www.r-tutor.com/gpu-computing/cuda-installation/cuda7.0-ubuntu ).

I have never been able to change NVIDIA_DRIVER_LIBRARY_PATH and CUDA_LIBRARY_PATH using env variables and get CUDALink to work.

I assume the Mathematica CUDA and Nvidia library paths as hardwired and I use symlinks from the libraries to the default locations where Mathematica is looking. It works for me! Mathematica is looking in /usr/lib64, this does not exist on my system, so;

cd /usr
sudo mkdir lib64

Locate your libnvidia-tls.so file, I used find

stuart@stuart-2015:~$ find / -name libnvidia-tls.so* 2>/dev/null
/usr/lib/nvidia-346/libnvidia-tls.so.346.82
/usr/lib/nvidia-346/tls/libnvidia-tls.so.346.82
/usr/lib32/nvidia-346/libnvidia-tls.so.346.82
/usr/lib32/nvidia-346/tls/libnvidia-tls.so.346.82

I have a 64bit system, I ignore the lib32 libraries, I have 2 choices;

/usr/lib/nvidia-346/libnvidia-tls.so.346.82
/usr/lib/nvidia-346/tls/libnvidia-tls.so.346.82

these are actually different files, I dont know what the difference is, or which is preferred, but there are only two choices, so I try the second file first and symlink like so;

sudo ln -s /usr/lib/nvidia-346/tls/libnvidia-tls.so.346.82 /usr/lib64/libnvidia-tls.so.346.82

With the cuda library, we find these files;

find / -name libcuda.so 2>/dev/null
/usr/lib/i386-linux-gnu/libcuda.so
/usr/lib/x86_64-linux-gnu/libcuda.so
/usr/local/cuda-7.0/targets/x86_64-linux/lib/stubs/libcuda.so

I need the 64-bit version, issue the symlink command;

 sudo ln -s /usr/lib/x86_64-linux-gnu/libcuda.so.346.82 /usr/lib64/libcuda.so

Now open Mathematica and test;