Out-of-core arrays

# Numpy

np.ndarray(shape=(2,2), dtype=float, order='F')

# Out-of-core data

np.ndarray(shape=(1e18,2), dtype=float, order='F')

# Full out-of-core

np.ndarray(shape=(1e9,2e9), dtype=float, order='F')

2 Exabyte

Best out-of-core topology depends on the algorithm and array geometry