pycuda.autoinit fails after upgrade to 14.10

Bug #1388217 reported by on 2014-10-31
This bug affects 1 person
Affects Status Importance Assigned to Milestone
pycuda (Ubuntu)
pyopencl (Ubuntu)

Bug Description

From a Python terminal (python2 or python3):

>>> import pycuda.autoinit
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/pycuda/", line 4, in <module>
pycuda._driver.Error: cuInit failed: unknown

This worked in Ubuntu 14.04, fails in Ubuntu 14.10.

I can manually compile and run at least this example (devicequery):

and my system is using the proprietary NVIDIA drivers, so CUDA appears to be configured properly on my system.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: python-pycuda 2014.1-2
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Oct 31 11:47:39 2014
InstallationDate: Installed on 2011-03-04 (1337 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110301.7)
SourcePackage: pycuda
UpgradeStatus: No upgrade log present (probably fresh install)

I also git cloned the latest version of pycuda from the homepage, ran "python" and "python install --user", and have the same behavior.

Oh wow. I meant 14.10, not 12.10. Sorry :)

summary: - pycuda.autoinit fails after upgrade to 12.10
+ pycuda.autoinit fails after upgrade to 14.10
description: updated
Graham Inggs (ginggs) wrote :

Please try:

sudo apt-get install nvidia-modprobe

Will do when I get back to my computer on Monday, and I'll report back.

If you have time to fill me in a bit before then -- do you suspect that the
nvidia module isn't being loaded into the kernel? It seems like it is
because it's listed in lsmod (and performance indicates it, too), but I'm
not sure what that package is designed to do. I've never noticed it before.
Curious what the debugging motivation is...

Graham Inggs (ginggs) wrote :

I suspect the nvidia-uvm module isn't loaded. You can load it manually with 'sudo modprobe nvidia-uvm' before running python. The nvidia-modprobe package loads the necessary modules as needed, see LP: #1361207 .


sudo apt-get install nvidia-modprobe

Did indeed work! Awesome. So I guess this is a packaging / requirements error, then?

Answered my own question (it is a requirements problem) by looking at the linked issue. Feel free to close this as a duplicate.

Graham Inggs (ginggs) wrote :

Thanks for the feedback!

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