[cgs-wg] [CGS-WG Bug 14] Heidi Neumann's proposed class/association additions (OpenPBS)

[CGS-WG-bugzilla-daemon@gridforum.org]

http://bugzilla.gridforum.org/cgs-wg/show_bug.cgi?id=14

flon@isi.edu changed:

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                 CC|                            |mihajlov@de.ibm.com



------- Additional Comments From flon@isi.edu  2003-05-08 11:29 -------
Hi,

yesterday Heidi and I had the chance to talk to Waiman Chan (LoadLeveler) 
about the proposed extensions to the JSIM model. As a reminder: OpenPBS allows 
to specify a group of nodes (execution targets) on which the job can be run 
and the proposal was to reflect this appropriately in the model, if other 
scheduling systems have this capability too.

We learned that LoadLeveler also has the capability to restrict a job to a 
group of nodes. The difference is in the way these execution targets are 
specified. For OpenPBS they are statically defined entities, so 
called "Resources", that define the nodes belonging to the group. With 
LoadLeveler a job can require the presence of certain "Features", where  a 
feature is an arbitrarily defined property associated to a node. In contrast 
to OpenPBS multiple features can be specified for LoadLeveler jobs, thus 
allowing a fine grained selection of the execution targets.

Our proposal therefore would be to indeed add the node grouping concept to the 
model using a to-be-defined neutral name for the grouping class (i.e., neither 
feature nor resource).  The only structural change to Heidi's original 
proposal would be to change the cardinality of the association between Job and 
the "Group of Systems" class from one-to-one to one-to-many.

We're looking forward to your comments and would definitely welcome 
suggestions for a nice name for the "Group of Systems" class. I hope that we 
can close this item within the next two weeks.

Mit freundlichen Grüßen / Kind Regards
   Viktor Mihajlovski

Linux Technology Center

   IBM Laboratory Böblingen, Germany
   Phone +49-7031-16-2560
   E-Mail mihajlov@de.ibm.com




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