[glue-wg] Multicore related information in GLUE 2

[stephen.burke at stfc.ac.uk]

Resending to see if it gets out this time ...

> -----Original Message-----
> From: Burke, Stephen (STFC,RAL,PPD)
> Sent: 18 October 2015 10:46
> To: 'Maria Alandes Pradillo'; glue-wg at ogf.org
> Subject: RE: Multicore related information in GLUE 2
> 
> glue-wg-bounces at ogf.org [mailto:glue-wg-bounces at ogf.org] On Behalf Of
> Maria Alandes Pradillo said:
> > Are there any attributes in GLUE 2 describing multicore related
> information?
> 
> The model we ended up with describes execution slots rather than cores
> per se, i.e. GLUE itself doesn't say what hardware resources a slot
> corresponds to, but a profile could. However the expectation is that a
> slot will usually correspond to one core (or hyperthread) as that has
> been the traditional way to configure batch systems. A batch job can
> then be either single-slot or multi-slot - the assumption is that each
> job will specify a fixed number of slots and the scheduler will manage
> a fixed pool of slots, distributed in some way over the WNs. Whether
> that's sufficient for WLCG usage I don't know - what information do you
> think is required? When the schema was defined the ideas were based on
> MPI-type jobs which may be somewhat different.
> 
> > Is there a way in GLUE 2 to specify whether a queue has access to
> multicore resources?
> 
> The Share has a MaxSlotsPerjob attribute, so if that's > 1 it allows
> multislot jobs up to that limit. I'm not sure if that attribute is
> correctly published at the moment, but there was an MPI working group
> in EGI (possibly there still is) which tried to get sites correctly
> configured for their purposes.
> 
> Stephen