How do you stop numpy from multithreading? [duplicate]

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Only hopefully this fixes all scenarios and system you may be on.

  1. Use numpy.__config__.show() to see if you are using OpenBLAS or MKL

From this point on there are a few ways you can do this.

2.1. The terminal route export OPENBLAS_NUM_THREADS=1 or export MKL_NUM_THREADS=1

2.2 (This is my preferred way) In your python script import os and add the line os.environ['OPENBLAS_NUM_THREADS'] = '1' or os.environ['MKL_NUM_THREADS'] = '1'.

NOTE when setting os.environ[VAR] the number of threads must be a string! Also, you may need to set this environment variable before importing numpy/scipy.

There are probably other options besides openBLAS or MKL but step 1 will help you figure that out.

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