[Beowulf] first cluster

[Mark Hahn]

> It's a very neat idea, but it has the disadvantage - unless I'm
>misunderstanding - that if the job fails, and leaves droppings in, say, /tmp
>on the cluster node, the user can't log in to diagnose things or clean up
>after themselves.

my organization has ~4k users (~3-500 active at any time), and does not 
attempt to prevent access to compute nodes by users.  it just doesn't 
seem like a real, worth-solving problem.  heck, we have more trouble 
with users running jobs on _login_ nodes, rather than compute notes.
(many of our systems came with a pam-slurm module which did this;
we remove it.)

I don't think this is at all surprising.  if a user groks clusters 
at all, they'll know that cheating is not very effective (and not very
scalable) and stands a good chance of bringing trouble.

those who don't grok wind up running on the login nodes 
(where we have fairly tight RLIMIT_AS and CPU...)

regards, mark hahn.