[Beowulf] can't use both processors on each node

Shihnan Chen schen at hpl.umces.edu
Wed Apr 12 20:35:47 EDT 2006


hi all,
  we have a microway 10-node cluster (2 processors on each node) with 
OpenPBS and MAUI scheduler installed. I can  submit a MPI job through 
qsub but encountered some strange problems. Would somebody kindly give 
me some hints. Thanks

1. I can only use 1 cpu on 1 node when submitting a job.

   I tried the following in my script but failed.
   #PBS -l nodes=2:ppn=2
   mpirun -np 4 ./oceanM

I attach the /var/spool/pbs/server_priv/nodes and "pbsnodes -a" below. 
Is the configuaration correct (np=2) ?

2. Every time we submit a job, the master node will be used, which 
should not happen.



Here is the output of /var/spool/pbs/server_priv/nodes
 
node2 np=2
node3 np=2
node4 np=2
node5 np=2
node6 np=2
node7 np=2
node8 np=2
node9 np=2
node10 np=2

Here is the output of "pbsnodes -a"
node2
     state = free
     np = 2
     ntype = cluster
node3
     state = free
     np = 2
     ntype = cluster
node4
     state = free
     np = 2
     ntype = cluster
node5
     state = free
     np = 2
     ntype = cluster
node6
     state = free
     np = 2
     ntype = cluster
node7
     state = free
     np = 2
     ntype = cluster
node8
     state = free
     np = 2
     ntype = cluster
node9
     state = free
     np = 2
     ntype = cluster
node10
     state = free
     np = 2
     ntype = cluster

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