Not sure how well defined these are - some more than other. I can give
you my understanding of them and then people can jump in and tell me
where I'm wrong :)
Master Host -> the SGE master, i.e. the machine that runs
the 'qmaster' process; that's the process that
handles the scheduling etc. So that's the machine
that 'decides' where a job goes, and the machine
you connect to with things like 'qsub', 'qstat', ...
Submit Host -> (that's a well defined one) - a host in the list of
'submit hosts'. Means that the qmaster has been told
that jobs can be submitted from these hosts. As in,
if you run 'qsub job.sh' from a submit host, the
qmaster will schedule 'job.sh' for execution. If you
are not on a submit host, the qmaster would tell
you 'this host is not a submit host' and reject the job.
Compute Node -> a machine provided for, well, computing - as in, a
machine that is meant to offer CPU time for compute
tasks (not, say, as an infrastructure server)
Cluster Node -> a compute node that is part of a cluster - i.e. runs
a service that makes a qmaster aware of it's existance
and allows said qmaster to farm jobs to it (in SGE
terms, and execution host - running an 'execd' process)
I think 'compute node' and 'cluster node' are quite
often used as / understood as being the same.
Head Node -> Term that's quite often used for the Master Host. I'm
not sure on this one, but I always understood this in
the context of the 'traditional' cluster architecture
where your nodes are on a completely private network,
with one server - the head node - being 'in charge' of
the lot, often providing things like DHCP, NFS, ... to
the cluster nodes (and the qmaster service).
Login Node -> That one, I'm not sure. I think I've heard this used
both for cluster nodes that allow interactive jobs,
and for the submit host(s) in setups where only very
few hosts are allowed to submit (and you have to log in
to a designated machine to submit a job). And tons of
other things. Basically, a node that allows user logins.
As I've said before, only my 2c...
Tina
On 04/04/14 04:55, VG wrote:
I am working on SGE and I need some precise definition of some terms.
These are the terms I often hear about, but does not really understand them.
These are
|Head Node
Login Node
Compute Node
Submit Host
Cluster Nodes
Master Host
|
Any insight would be helpful
Thanks
Varun
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