[Mauiusers] Standing reservations claiming too many and wrong nodes

[Gareth.Williams at csiro.au]

> -----Original Message-----
> From: Fokke Dijkstra [mailto:f.dijkstra at rug.nl]
> Sent: Monday, 28 March 2011 8:40 PM
> To: mauiusers at supercluster.org
> Subject: [Mauiusers] Standing reservations claiming too many and wrong
> nodes
> 
> Hi,
> 
> On our compute cluster, running maui 3.3, we have a problem with
> standing reservations claiming too many nodes, and also claiming nodes
> of the wrong type.
> 
> The two reservations are defined like this:
> 
> SRCFG[short]    DEPTH=2 TASKCOUNT=8  NODEFEATURES=nodes FLAGS=SPACEFLEX
> ACCESS=DEDICATED
> SRCFG[short]    CLASSLIST=short
> SRCFG[short]    DAYS=Mon,Tue,Wed,Thu,Fri STARTTIME=08:00:00
> ENDTIME=18:00:00
> 
> SRCFG[md] DEPTH=2 TASKCOUNT=24 NODEFEATURES=nodes FLAGS=SPACEFLEX
> ACCESS=DEDICATED GROUPLIST=md
> 
> The first is in order to reserve a few nodes during office hours for the
> short queue. The second reserves nodes for a group of users.
> Note that both are tied to nodes with the feature "nodes".
> 
> We see, however, that maui very often is reserving a lot of nodes extra
> for the next reserving period. It also reserves nodes with the wrong
> node feature. Restarting maui helps fixing the reservation problem.
> 
> Is there a way to fix this problem in a more structural way?
> 
> Kind regards,
> 
> Fokke Dijkstra

Hi Fokke,

We had a similar problem and decided to just list the nodes to include in the reservation.  That turns out to be quite robust and situations where it causes problems have been rare.

- Gareth

> 
> --
> Fokke Dijkstra<f.dijkstra at rug.nl>
> High Performance Computing&  Visualisation
> Donald Smits Center for Information Technology, University of Groningen
> Postbus 11044, 9700 CA  Groningen, The Netherlands
> +31-50-363 9243
>