[Beowulf] scheduler and perl

Stuart Midgley sdm900 at gmail.com
Tue Aug 1 17:58:14 PDT 2006

Rather than banning them or publishing behaviour, we simply disable  
their access to the queue and won't re-instate it until they have  
contacted us to indicate they have rectified their ways.

eg. rather than enforce hard disk quotas, which may result in a job  
loosing data, we simply detect when they are over quota and  
automatically stop their access to the queue and send them an email  
saying what has happened.

They tend to clean up quickly :)

Of course you need a tightly controlled system which prevents them  
circumventing the queue.


On 02/08/2006, at 6:58, Diego M. Vadell wrote:

>> Hi Jerry:
>>> the other example is that use system call and ssh
>>> to each node and run stuff and bypass the scheduler...
> Torque 2.1.2 has just been released. It comes with a pam module  
> that, if I
> understood it right, makes harder (though not impossible) for users to
> bypass the batch system. The documentation is inside the Torque  
> tarball.
> Maybe you can collect some logs and make a list of misbehaving  
> users. Then
> you can warn the users that you are collecting that information, that
> bypassing the system will degrade the performance for everybody,  
> and that
> you may post that information. Sometimes the perspective of public
> humillation makes wonders :)
> But, be warned! its just an idea, Im not expert in treating users (or
> anything else, for the matter).
> Hope it helps,
>  -- Diego.

Dr Stuart Midgley
sdm900 at gmail.com

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