[torqueusers] Semaphores limit per job/user in torque?

Andrew Savchenko bircoph at gmail.com
Tue Sep 24 09:37:06 MDT 2013


Hello,

On Mon, 23 Sep 2013 14:50:47 -0600 David Beer wrote:
> Andrew,
> 
> So are the processes for these completed jobs still existent on the nodes,
> or is the issue that exiting the process doesn't guarantee a release of the
> semaphore?

The job processes are finished, but semaphores are left unattended on
the node. 

The problem is that it is not safe to remove semaphores in the
epilogue after job completed, because this semaphores may be used by
other jobs of the same user on the same node. IPC semaphores are not
connected to the job, but to the user, that is the problem. I
described it in more detail in another letter to Mark in this topic.

Best regards,
Andrew Savchenko
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