Number of cores Skyfield

[denislecodeur13]

Hello, I would like to ask a question on the number of cores that Skyfield uses. Skyfield uses the maximum core on the machine or only one core?

[brandon-rhodes]

Skyfield is written in simple single-threaded Python. Any parallel operations will occur because you either create threads yourself and set them to work on different segments of your problem, or because NumPy — the vector library that Skyfield uses for number array operations — performs matrix operations in parallel. In general, users have found parallel operations to be a problem rather than a benefit. Here's the relevant documentation, with a link to a relevant issue:

https://rhodesmill.org/skyfield/accuracy-efficiency.html#bad-performance-and-using-100-cpu