Python Doesn’t Use All CPU Cores

Is your Python script refusing to use all CPU scores on your server, and just using 1 CPU core out of the 16 CPU cores?

It could be that the core affinity is messed up.

As it turns out, some modules mess with the core affinity on import, which end up forcing your Python script to use only one CPU core in the end. Just add this before you run the Python script:

<span class="pln">os</span><span class="pun">.</span><span class="pln">system</span><span class="pun">(</span><span class="str" style="color: #800000;">"taskset -p 0xffffffff %d"</span><span class="pun">%</span><span class="pln"> os</span><span class="pun">.</span><span class="pln">getpid</span><span class="pun">())</span>

And then voila! It looks right now!

You can find more details in this StackOverflow thread.