==== OpenMP and process pinning ====

When starting hybrid OpenMP/MPI jobs, process pinning (cpu affinity) should be disabled. Otherwise
all threads will bind to one core. Pinning can be disabled by setting an environment variable, depending 
on the MPI version used:


IntelMPI:
<code>
export I_MPI_PIN=0
</code>

MVAPICH2:
<code>
export MV2_ENABLE_AFFINITY=0
</code>