[torqueusers] specifying nodes and ppn: what is expected?
sdavis2 at mail.nih.gov
Fri Nov 30 10:40:02 MST 2007
I have a simple cluster (two nodes for now) set up and running using
pbs_sched. I submit the following using qsub as a script:
# --- send the job to 4 nodes, with 2 processors per node
# PBS -l nodes=2:ppn=4
# --- send the output to the test.out file
# the default is .o<jobid>
#PBS -o test.out
# --- send the error output to the test.err file
# the default is .e<jobid>
#PBS -e test.err
# --- print out the list of nodes this job is running upon
echo "Print out the hostname and date"
The output that I get for $PBS_NODEFILE is a single line representing a
single node. However, if I replace the node specification with:
I get eight lines in PBS_NODEFILE, four for each node. I would have
expected the output of both nodes specification to be the same. The
documentation and examples I have seen suggest this, also. Have I missed
some configuration flag or the like to get -l nodes=2:ppn=4 to get me four
processors on each of two nodes?
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