Title: How to allocate one job with one processor in 2 (physical cpus) 4 ( processors in each cup) nodes?

Dear all,
I have setup a cluster running on Centos5.2. The hardware: Dell poweredge 1950 for compute node with 64-bit Quad-Core Intel®  Xeon®  processors. That is, in each node there are 2 physical cpus with 4 Processors in each.
I specify np=8 in server_priv/nodes file for each node. in maui.cfg I just specify NODECFG[nodex] MAXJOB=8.
The job submission script looks like:
#!/bin/sh

#PBS -q serial
#PBS -N Serial_Job
#PBS -l nodes=1:ppn=1
#PBS -l ncpus=1
#PBS -V
#PBS -o output
#PBS -e error

./a.out

However, when I submit 8 jobs to a node, it seemed that the 8 jobs are crampped into only one processor, not one job one processor !

Anyone can tell me how?

Regards

RQ Wu

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