[Mauiusers] job submitted to multiple nodes is blocked

Peter Crosta pmc2107 at columbia.edu
Wed Mar 30 08:43:14 MDT 2011


Hi Robert,

Do you have the following line in your maui config?

ENABLEMULTIREQJOBS    TRUE

I believe it is require to request multiple resources.

Best,
Peter
 
-----Original Message-----
From: mauiusers-bounces at supercluster.org
[mailto:mauiusers-bounces at supercluster.org] On Behalf Of Robert Jacobi
Sent: Tuesday, March 29, 2011 9:30 PM
To: mauiusers at supercluster.org
Subject: [Mauiusers] job submitted to multiple nodes is blocked

Hello,

We're running Maui with Torque on our cluster (10 nodes, 8 cores each). 
When I submit a job on multiple nodes specifying them in a certain why my
job gets blocked by Maui, otherwise it runs just fine.

Here's the line I usually use in submission script to submit jobs to
mutliple nodes (say if I need 16 cores): "#PBS -l nodes=2:ppn=8". That works
just fine.

But when I don't need a multiple of 8 processors and don't want to block
processors unnecessarily, I tried the following (say to get 20 cores): 
"#PBS -l nodes=2:ppn=8+1:ppn=4"
According to the Torque user manual that should get me 16 cores on 2 nodes
and 4 cores on the third. I can submit it without a problem, but then it is
blocked by Maui.
For testing I also tried "#PBS -l nodes=1:ppn=1+1:ppn=1" and "#PBS -l
nodes=1:ppn=8+1:ppn=8", which are blocked as well

Output from showq for the blocked job:
================================================================
BLOCKED JOBS----------------
JOBNAME            USERNAME      STATE  PROC     WCLIMIT            
QUEUETIME
1272                 robert  BatchHold     1    00:00:30  Tue Mar 29 
18:06:47
================================================================

The relevant policies (as far as I know), which are set in maui.cfg, are:
NODEACCESSPOLICY        SHARED
JOBNODEMATCHPOLICY      EXACTNODE

Please, can anybody point me to where the problem might be? If there are
queue specific settings that could cause this, I'd be more than happy to
provide more information.

Thanks,
Robert

PS: I am aware that I could just reserve multiple of 8 processors and let
some of them sit idle, but on our relatively small cluster that amounts to s
significant waste of resources.

--
Robert Jacobi
Research Assistant
University of Arizona
Department of Aerospace & Mechanical Engineering
1130 N. Mountain Ave.
Tucson, AZ, 85721-0119

tel: +1 (520) 621 4369
mail: rjacobi at email.arizona.edu


The less time you spent on algebra in life, the more time you have to be a
happy person. (Kerschen)

Doubt is not a pleasant condition, but certainty is absurd. (Voltaire)

All great truths begin as blasphemies. (Shaw)

Denken ist etwas, das auf Schwierigkeiten folgt und dem das Handeln
vorausgeht.(Brecht)

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