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Subject: [OMPI users] openmpi 1.6.3, job submitted through torque/PBS + Moab (scheduler) only land on one node even though multiple nodes/processors are specified
From: Sabuj Pattanayek (sabujp_at_[hidden])
Date: 2013-01-24 09:34:29


I'm submitting a job through torque/PBS, the head node also runs the
Moab scheduler, the .pbs file has this in the resources line :

#PBS -l nodes=2:ppn=4

I've also tried something like :

#PBS -l procs=56

and at the end of script I'm running :

mpirun -np 8 cat /dev/urandom > /dev/null


mpirun -np 56 cat /dev/urandom > /dev/null

...depending on how many processors I requested. The job starts,
$PBS_NODEFILE has the nodes that the job was assigned listed, but all
the cat's are piled onto the first node. Any idea how I can get this
to submit jobs across multiple nodes? Note, I have OSU mpiexec working
without problems with mvapich and mpich2 on our cluster to launch jobs
across multiple nodes.