[jsdl-wg] POSIXApplication Limits

[Donal K. Fellows]

Peter G. Lane wrote:
> Just to make sure I'm understanding your point completely, neither JSDL 
> nor any of it's normative extensions provide a way, not including custom 
> extensions, to specify resource limits for jobs submitted to resource 
> managers (i.e. PBS, LSF, Condor, ...). The POSIXApplication limits 
> should be used only by applications that are able to directly set the 
> ulimit values before executing a process. Is this is a valid statement?

To be exact, we expect people to specify (in the jsdl:Resources section)
what resources their job needs to execute successfully (if they specify
too little, that's too bad) and for the resource manager to use that
information to compute how many resources to allocate to the job. It is
also up to the resource manager to choose how to implement said
allocation; JSDL does not mandate any particular mechanism. If the
mechanism chosen includes the use of POSIX limits, it is obviously
incumbent upon the implementation to set the limits such that the
requirements within the POSIXApplication section are also met; I would
not expect any implementation to allow the Limits to be used to gain any
extra allocation of resources above and beyond what was asked for in the
Resources section.

One way of doing this might be for the resource manager to first set up
hard limits and then to use the various PA/*Limits to refine those with
extra soft limits.

Donal.