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Subject: [OMPI users] mpirun is using one PBS node only
From: Belaid MOA (belaid_moa_at_[hidden])
Date: 2009-12-01 15:15:54


Hi everyone,
 Here is another elementary question. I tried the following steps found in the FAQ section of www.open-mpi.org with a simple hello world example (with PBS/torque):
 $ qsub -l nodes=2 my_script.sh

my_script.sh is pasted below:
========================
#!/bin/sh -l
#PBS -N helloTest
#PBS -j eo
echo `cat $PBS_NODEFILE` # shows two nodes: WN1 WN2
cd $PBS_O_WORKDIR
/usr/local/bin/mpirun hello
========================

When the job is submitted, only one process is ran. When I add the -n 2 option to the mpirun command,
two processes are ran but on one node only. Note that echo `cat $PBS_NODEFILE` outputs
the two nodes I am using: WN1 and WN2.

The output from ompi_info is shown below:

$ ompi_info | grep tm
              MCA memory: ptmalloc2 (MCA v2.0, API v2.0, Component v1.3.3)
                 MCA ras: tm (MCA v2.0, API v2.0, Component v1.3.3)
                 MCA plm: tm (MCA v2.0, API v2.0, Component v1.3.3)

 Any help on why openMPI/mpirun is using only one PBS node is very appreciated.

Thanks a lot in advance and sorry for bothering you guys with my elementary questions!

~Belaid.

                                               
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