Thread usage of pywt

[stefanratea]

Hi! Sorry to bother you with this question, but i'm very curious why does including your package in an empty script spawn 15 threads on my computer.
`import pywt

while(True):
print("running")`

Your work is great, and it functions as expected. Thank you very much!

[rgommers]

That looks unrelated to PyWavelets. I'm guessing all it is is import numpy as np, and this is the OpenBLAS thread server. Can you please check if just importing numpy reproduces it? If so, it's known and harmless.

[stefanratea]

Thanks for the quick answer! Replacing pywt with numpy only created 8 threads.

I'm not worried about harmful code getting executed, rather i'm thinking about the reserved threads on a aws server.

[rgommers]

I'm not sure, nothing else beyond numpy and standard library modules should be imported. You can try export OPENBLAS_NUM_THREADS=1 to see if that makes a difference. PyWavelets itself shouldn't be doing anything thread-related.