[Beowulf] picking out a job scheduler
reuti at staff.uni-marburg.de
Fri Jan 5 07:58:28 EST 2007
Am 05.01.2007 um 01:09 schrieb Chris Samuel:
> On Thursday 04 January 2007 22:16, Reuti wrote:
>> Linda and PVM* need some kind of rsh/ssh between the nodes, and I
>> didn't get a clue up to now to convince Linda to use the PBS TM of
> Torque provides a pbsdsh command that uses the TM interface and
> acts like the
> various DSH variants. What it doesn't appear to be able to do
> (which I've
> just discovered) is to be able to only run once per node in the
> job. Hmm..
You can run it once per node with the -n option. Trying to simulate
rsh would simply mean to map the hostname of the requested machine to
an index in the list of granted machines - no big deal. The bigger
problem seems to be, that there is no real environment on the nodes
where the slave tasks are started. I.e. no environment variables set.
>> As you mentioned in your other post about keeping control of
>> MPI processes, the similar thing to TM is the qrsh command in SGE,
>> which will replace rsh/ssh and SGE is controlling this way these
>> spawned processes on the nodes.
> Sounds very similar to pbsdsh in the way it works.
>> I'm also always looking in a cluster setup, without any common rsh/
>> between the nodes at all, where users could by accident start
>> processes out
>> of control of the queuing system on the nodes.
> Exactly. What we do here is a hack in the /etc/profile that checks
> for the
> existence of $PBS_ENVIRONMENT and kicks them off with a message
> about only
> being permitted to access the node if you have a job on it. Ugly,
> but it
> Newer versions of Torque have a PAM module contributed by Jim
> Prewett which
> will check the user against the current list of Torque jobs on a
> node and
> only permit access if they have a job on the node.
> We prefer to only allow access via a PBS jobs which is why we still
> use our
> hack, but the PAM module might be a handy backstop for us.
> Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
> Victorian Partnership for Advanced Computing http://www.vpac.org/
> Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia
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