I am trying to use as much parallelism as possible on my computing grid. In this sense, I combine MPI+OpenMP. MPI processes are spawned fine, but OpenMP threads always amount to 1, no matter that I set local_num_threads correctly (https://nest-simulator.readthedocs.io/en/latest/hpc/slurm_script.html#set-local-num-threads-in-your-nest-script) as well as all SLURM variables. I am sure I have compiled nest with OpenMP too.

I use slightly modified izhikevich neurons with stdp synapses. Can the model specifics be the cause of underutilizing available threads? Or is there something else in the system that could be the reason for that?
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