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Hello Ramon--

> 
> On the Node that is running two processes named xplor are spawned by
> xplor-NIH. Both processes generate output PDBs, whereas I only want one.
> (Just like I would like to run ONE xplor-NIH on this node)
> 

If, in your PBS script, you have a line like this 
cat $PBS_NODEFILE $PBS_NODEFILE > $XPLOR_MACHINES
change it to
cat $PBS_NODEFILE > $XPLOR_MACHINES


> The logfile remains empty. Probably because writing is hampered by two
> processes trying to write to this file.

what is in the file script.out.0? This is the Xplor-NIH logfile as
specified in the PBS script.

> 
> When I type qdel 14477 (delete the xplor-NIH process)
> The process is eliminated from the queue, but both processes keep on
> running on the node.

This is a problem for your PSB administrator- it should clean up after
rogue jobs. That said, you could simplify your ``run xplor'' statement
for your case to make this more bulletproof. Change it to

 $XPLOR $PY -parallel -o $LOGFILE $XPLOR_SCRIPT

if you really only want a single process running.

If you have a cluster with 2-cpus per node, and your PBS daemon
allocates one job per node (as is the case here at NIH), there will be
an idle CPU if you make the changes above.

hope this helps--
Charles

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