[cgs-wg] Proposal for. Bug 14

["Viktor Mihajlovski" <MIHAJLOV@de.ibm.com>]

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