[Swift-user] Coasters and PBS resource requests: nodes and ppn

[Allan Espinosa]

Hi Matthew,

Does this mean, coasters will now submit nodes=1;ppn=1 and do node packing?

If there is no node packing being initiated by PBS, you can just
specify workersPerNode=8 .  But then what you request to PBS is now
different to what you actually use.

-Allan

2010/11/3 Matthew Woitaszek <matthew.woitaszek at gmail.com>:
> Good afternoon,
>
> Is there a way to update PBS resource requests when using coasters to supply
> modified PBS resource strings such as "nodes=1:ppn=8"? (Or other arbitrary
> resource requests, such as node properties?)
>
> Of course, I'm just trying to get coasters to allocate all of the processors
> on an 8-core node, using either the "gt2:gt2:pbs" or "local:pbs" provider.
> Both submit jobs just fine. I found no discernible difference with the
> "host_types" Globus namespace variable, presuming I'm setting it right.
>
> The particular cluster I'm using allows node packing for users that run lots
> of single-processor tasks, so without ppn, it will assume nodes=1,ncpus=1
> and thus pack 8 jobs on each node before moving on to the next node. (I know
> it won't be an issue at sites that make nodes exclusive. On this system, the
> queue default is "nodes=1:ppn=8", but because coasters explicitly specifies
> the number of nodes in its generated resource request, the ppn default seems
> to get lost!)
>
> I see that this has been discussed as far back as 2007, and I found Marcin
> and Mike's previous discussion of the topic at
>
>    http://mail.ci.uchicago.edu/pipermail/swift-user/2010-March/001409.html
>
> but there didn't seem to be any definitive conclusion. Any suggestions would
> be appreciated!
>
> Matthew
>

-- 
Allan M. Espinosa <http://amespinosa.wordpress.com>
PhD student, Computer Science
University of Chicago <http://people.cs.uchicago.edu/~aespinosa>