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Subject: [OMPI users] Problem submitting TORQUE jobs with ppn=1
From: Gijsbert Wiesenekker (gijsbert.wiesenekker_at_[hidden])
Date: 2010-08-17 05:29:27


I have a four-node quad core cluster. I am running OpenMPI (version 1.4.2) jobs with Torque (version 2.4.8). I can submit jobs using
#PBS -lnodes=4:ppn=4
And 16 processes are launched. However if I use
#PBS -lnodes=4:ppn=1
or
#PBS -lnodes=4
The call to MPI_Init is succesful, but the call to
MPI_Comm_size(MPI_COMM_WORLD, &mpi_nprocs)
hangs and never returns.

Any ideas? Any workarounds?

Gijsbert