CUDA - OwnerBox::close failure

From: Vlastimil Zíma (
Date: Wed Oct 24 2012 - 05:21:43 CDT


I use latest NAMD 2.9 for Linux-x86_64-multicore-CUDA downloaded as
compiled binary. I have troubles to run it on one of the machines I
use. It has GeForce 9600 GT and run on Ubuntu Precise with kernel
3.2.0-32-generic. We tried drivers from nvidia in versions 295.40 and

When I start namd there it runs for a few steps (between 0 and 38000)
then it pauses on error

OwnerBox::close() - close called, but closeCount 0 openCount 1

Namd is still running on all the processors which were used, it just
does not proceed with the computation (maybe it does, but it does not
produce any output).

The script I use to start the namd:

+idlepoll +p8 +devices 0 "$@"

The simulated system is small, it has only 10752 atoms and is under
periodic boundary condition. Simulation works fine, when I use namd
only on CPUs. I can add any additional information which are required
to identify or solve the problem.

I will be glad for any help

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