Why does multiprocessing use only a single core after I import numpy?

Why does multiprocessing use only a single core after I import numpy?

python linux numpy multiprocessing blas

linux

Time waste of execv() and fork()

linux unix operating-system multiprocessing fork

linux

Performance discrepancy between OSX and Linux for communication using Python multiprocessing

python linux macos multiprocessing communication

linux

Multiprocessing with "fork" context blocks on Linux/Intel Xeon with Python 3.6.1?

python linux python-3.x multiprocessing fork

linux

Kill Python Multiprocessing Pool

python linux multiprocessing

linux

Python multiprocessing memory usage

python linux memory-management multiprocessing

linux

High Kernel CPU when running multiple python programs

python linux performance multiprocessing

linux

OSError 38 [Errno 38] with multiprocessing

python linux multiprocessing

linux

Bash: Running the same program over multiple cores

linux bash parallel-processing multiprocessing

linux

How to do proper file locking on NFS?

python linux multiprocessing locking nfs

linux

Multiple instances of Python running simultaneously limited to 35

python linux parallel-processing multiprocessing openblas

linux

Why are the children failing to die?

python linux multiprocessing

linux

What's the advantage of queues over pipes when communicating between processes?

python linux queue multiprocessing pipe

linux

performance - multithreaded or multiprocess applications

linux multithreading multiprocessing

linux

Multiprocessing Process terminate fails on Linux

python linux python-3.x multiprocessing

linux