6 Aug
2023
6 Aug
'23
12:02 p.m.
Dear Stefan,
Have you tried setting the OMP variable in your batch script? Something
like:
export OMP_NUM_THREADS=<No. of threads>
You should do this before your srun call to the nest script and in
combination to setting the local_num_threads, as well as the right value
for -c (or --cpus-per-task).
All the best,
Sandra
On 05.08.23 13:05, Stefan Dvoretskii wrote:
Hello all,
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-l…)
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?
Best regards,
--
Stefan Dvoretskii
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Dr. Sandra Diaz Pier
Simulation & Data Lab Neuroscience
Jülich Supercomputing Centre
Institute for Advanced Simulation
Forschungszentrum Jülich
Office: +49 2461 61-8913
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