Can't request all the nodes in my cluster

[itornes at juno.com]

I'm running an 8 node cluster using Redhat Linux 9.0.  I set the cluster up using Oscar 3.0 and I'm running OpenPBS 2.3.16 with mpiexec and using the Maui scheduler.  I was not able to patch OpenPBS b/c oscar doesn't install the source files.  mpiexec seems to run just fine without the patch.  

Each of my nodes has a 3.06 GHz P4 chip with hyper threading supported by the motherboard.  OpenPBS recognizes this and tells me I have 8 nodes each with 2 virtual processors.  

When I submit a  job via PBS I cannot request more than 8 nodes.  It complains that I have exceeded the available resources.  However if there are no jobs running on the cluster, and I request 8 nodes, it starts the job on 4 of the nodes using 2 processes per node.  This leads me to believe that hyperthreading is working fine.  

Is my problem a PBS problem, or something to do with mpiexec?  

Thanks.

Ivan



________________________________________________________________
The best thing to hit the Internet in years - Juno SpeedBand!
Surf the Web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!