The traceback module enables 'set -eu' which makes the shell fail when
bash scripts not written considering strict-mode are loaded.
For instance conda's de/activate scripts fail with 'set -u'.

Using --ntasks actually causes srun to spawn that many tasks.
So @5 with -c 10 actually ran 50!! jobs.

One extra feature from using --cpus-per-task is that each thread gets
pinned to a different CPU-thread on different CPU alignments.
Probably the best for that little extra performance gain.