Running error with OMP_NUM_THREADS

[Alpha-Legion]

I tried to run the first example "helmholtz.py" of the tutorial.
The error message is:

firedrake:WARNING OMP_NUM_THREADS is not set or is set to a value greater than 1, we suggest setting OMP_NUM_THREADS=1 to improve performance

I don't understand this. It seems related to the failure of the multislot(?) test after installation. The single-slot(?) test was successful.

[connorjward]

That is just an advisory to improve performance, not an error. If something failed please share the full output (not as a screenshot).

[Alpha-Legion]

Thanks! The full output is:

firedrake:WARNING OMP_NUM_THREADS is not set or is set to a value greater than 1, we suggest setting OMP_NUM_THREADS=1 to improve performance
Traceback (most recent call last):
File "/mnt/d/Research/1_Projects/firedrake_tutorial/helmholtz.py", line 96, in
VTKFile("helmholtz.pvd").write(u)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/l/venv-firedrake/lib/python3.12/site-packages/firedrake/output/vtk_unavailable.py", line 3, in init
raise ModuleNotFoundError(
ModuleNotFoundError: Error importing vtkmodules. Firedrake does not install VTK by default, you may need to install VTK by running
pip install vtk