Hi Andreas! Yes, definitely
 

Hi Andreas!

Yes, definitely you're running on a single CPU. This explains the strange results.

About your job-script: I had similar problems when trying to run with the supplied OpenMPI and PBS. Do you use OpenMPI?

If yes, you should try to change your execution line to:

mpirun -hostfile m_nodes -np $nrnodes $solver $PBS_O_WORKDIR $casename -parallel

This delives the names of the "slaves" to mpirun.

Bye,

Carsten