[SCore-users-jp] [SCore-users] Re: [Mauiusers] Maui with OpenPBS and SCore

[James O'Dell]

I'm not sure that I'm fully qualified to answer all of your questions,
so I've CC'd the SCore useres mailing lits. 

First off, SCore has made some minor changes to PBS directly related to
the issue of who is the master. A SCore job gets launched on the
cluster front-end node. The front end node establishes the compute
environment by executing the "scout" command with a node-list.

First, what is the best 
> way to determine which node is the master? 

Currently, the SCore modifications to PBS look for a SCore property
in the nodelist and then ask the front-end to establish the environment.

Is it guaranteed to have 
> certain node features.

The master must be on the front-end node and have the "scout" command
available.

Should the master only receive SCore jobs or are 
> other jobs fair game.

The master can only receive SCore jobs if they are so marked by the
SCore attribute. Without the SCore attribute, the node can execute
other kinds of parallel jobs.

There might be other attributes that would be nice to pass through to
SCore, such as the network interface to use but I am not sure, in
general how to answer your question.

In the PBS node file, an attribute, score, is added to indicate which
nodes are capable of running SCore jobs.

I'm sure that the SCore developers can be more precise that I can, I've
only been working with the system for a few weeks.

Thanks for the support!

Jim
>  

On Tue, 2003-04-08 at 12:43, help ＠ supercluster.org wrote:
> James,
> 
>   Maui is currently unaware of SCore and any of its dependencies.  With 
> luck, this will not be true by the end of the week however!  To help you 
> out, we need more information about a typical SCore cluster including its 
> layout, and how jobs are supposed to be launched.  First, what is the best 
> way to determine which node is the master?  Is it guaranteed to have 
> certain node features.  Should the master only receive SCore jobs or are 
> other jobs fair game.  Are there other node attributes which have 
> significance?  Does the scheduler launch a single task of the job to the 
> master?  How does it tell the master which nodes are available for its 
> use?  Is the master constrained to use these nodes?
> 
> Thanks!
> Supercluster Development Group
> 
> On 4 Apr 2003, James O'Dell wrote:
> 
> > Has anyone tried the combination above?
> > 
> > I have dropped in Maui and gotten it to schedule jobs
> > in the SCore/OpenPBS environment.
> > 
> > Using the standard OpenPBS scheduler everything interacts
> > with SCore correctly (i.e., if follows the correct protocol
> > to spawn a compute job)
> > 
> > Using Maui causes OpenPBS to use an incorrect procedure to
> > spawn a job. (In the SCore environment, one executes a
> > job - scout, which then gets everything else going. scout only
> > exists on the front-end node) Using the maui scheduler, OpenPBS tries to
> > run scout on one of the compute nodes.
> > 
> > Typically one tells OpenPBS about SCore by doing
> > 
> > qsub -l nodes=4:score
> > 
> > Would there be any reason that Maui doesn't pass on the score
> > attribute correctly?
> > 
> > Thanks,
> > Jim
> > _______________________________________________
> > mauiusers mailing list
> > mauiusers ＠ supercluster.org
> > http://supercluster.org/mailman/listinfo/mauiusers
> > 
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