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:
#PBS -N helloTest
#PBS -j eo
echo `cat $PBS_NODEFILE` # shows two nodes: WN1 WN2
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!
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