[Mauiusers] job submitted to multiple nodes is blocked

Robert Jacobi rjacobi at email.arizona.edu
Tue Mar 29 19:30:23 MDT 2011


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            
1272                 robert  BatchHold     1    00:00:30  Tue Mar 29 

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

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.


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

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