Improve / monitor CLI load time

[Dieter Werthmüller]

CLI load time

The load time of emg3d is somewhat slow. As the 3D computation is likely to take much longer, it is not that crucial. Yet it is still annoying for a simple, e.g., emg3d --help or emg3d --version.

The main culprits are

• discretize, principally the load of matplotlib -> make it lazy loading!
• xarray -> check in their issues/PR's
• numba => This should improve significantly with numba v0.56.0
• numpy, scipy.special (not much to do about)
• h5py -> make it lazy loading!

ToDo

• Try to bring down load time!
• Add a test monitoring the load time

Relevant links

• https://peps.python.org/pep-0690/
• https://scientific-python.org/specs/spec-0001/

Snapshots

emg3d v1.7.0, Date: Fri Jul 22 2022

[Dieter Werthmüller]

Situation improved a lot. With #319, the minimum requirement is now SciPy 1.9, which lazy-loads its module. Load time is down from 2.6 s to 0.3 s: emg3d 1.8.3.dev3, numpy 1.24.4, scipy 1.11.1, numba 0.57.1, discretize 0.10.0, xarray 2023.6.0; most dependencies improved massively: discretize (lazy loading matplotlib), scipy (lazy loading submodules), numba, numpy, xarray.