[Users] Cactus Core Usage on HPC Cluster

[Gwyneth Allwright]

Hi All,

I'm trying to get the Einstein Toolkit installed on an HPC cluster running
SLES. The trouble is that Cactus tries to use all the available processors
even when I specify a smaller number (by setting ppn in my PBS script).

As a test, I tried running the compilation with a parameter file that
required about 5 GB of RAM. In my PBS script, I set nodes=1 and ppn=3, and
then ran using openmpi-1.10.1:

mpirun -hostfile $PBS_NODEFILE <ET exe> <parameter file>

This resulted in the simulation running on all 24 available processors,
even though I'd only requested 3. Since PBS and MPI are integrated, I was
told that using -np with mpirun wouldn't help.

Does anyone know how to address this issue?

Thanks,

Gwyneth
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