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

David Beer dbeer at adaptivecomputing.com
Mon Sep 23 09:56:13 MDT 2013


Can you be more specific about what you mean when you say semaphores?

On Sat, Sep 21, 2013 at 3:09 PM, Andrew Savchenko <bircoph at gmail.com> wrote:

> Hello,
> is it possible to limit or isolate semaphores per job or user at
> worker node in torque?
> At our cluster we have a problem with buggy user jobs which left
> semaphores behind leading to semaphore limit exhaustion. While limit
> may be lifted, this is not a proper solution since it will be reached
> again later. ATM we a running cron job using some heuristics to
> determine which semaphores are safe to clear. But this is still
> nothing but a workaround.
> The proper way is to isolate job or at least user IPC namespace on
> nodes. This can be done using IPC namespace kernel feature, though I
> don't know if torque is capable of this or any other ways to control
> job's IPC.
> ATM we're using torque-3.0.6, though if 4.x branch is capable of this
> feature, it will be a good reason to migrate.
> Best regards,
> Andrew Savchenko
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David Beer | Senior Software Engineer
Adaptive Computing
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