[Mauiusers] Node allocation query

[Eugene van den Hurk]

Hello,

I am using Maui 3.2.6p16 and Torque 2.1.1
I am testing submitting a job to the maui scheduler using an mpirun.
All the nodes on the cluster are dual processor and if you choose:

#PBS -l nodes=<node_count>:ppn=2

in the pbs script everything is fine.

But if I choose just:

#PBS-l nodes=2

(I understand that this is the same as choosing: #PBS-l nodes=2:ppn=10)
It only picks one nodes for the machine file for the mpirun and not two nodes.
(My script uses the $PBS_NODEFILE variable to generate a machine file).

I would have thought in this case it would try to use one processor 
on two different nodes?

Any help would be greatly appreciated.

Thanks,
Regards,
Eugene.