Re: Clusterwide pids

["David L. Nicol" <dnicol@cstp.umkc.edu>]

Greg Freemyer wrote:
> 
> SInce this mailing list is dedicated to sharing cluster component technologies
> amongst the various Open Source cluster projects, Bruce Walker's comments got
> me thinking:
> 
> Definition:
> CPID - Clusterwide Process ID.  Guaranteed to be unique for each process across the entire cluster.
> 
> (please advise if there is a pre-existing Acronym for this.)
> 
> Assumptions:
> CPIDs are a useful concept and one that is used by several existing cluster solutions.
> 
> Sophisticated features, such as transparent clusterwide IPC, seem to require CPIDs


Without reading all the other posts in this thread, here's what I have to
say on the subject (yes, how arrogant.)

if per-machine PIDs  (LPID) remain as they are now, and CPID is created by
combining
the LPID with the node number, a CPID then becomes a structure of two
identifiers.

A process could have one or more CPIDs over its life, and might have
different
CPIDs in two different clusters that its node is part of.


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