---
title: "Why Does Python Multiprocessing Behave Differently on Windows and Linux?"  
description: "Why Does Python Multiprocessing Behave Differently on Windows and Linux?"  
author: "Magdalena Michalska"  
published: 2026-10-22  
canonical: https://answers.mindstick.com/qa/118125/why-does-python-multiprocessing-behave-differently-on-windows-and-linux  
category: "Mix Category"  
tags: ["Python", "Multiprocessing", "programming"]  
reading_time: 1 minute  

---

# Why Does Python Multiprocessing Behave Differently on Windows and Linux?

A small Python script that uses `multiprocessing` works on my Linux machine, but on Windows it either starts extra processes or fails when I run it from a notebook. The processing function itself seems fine.

What differences in [process startup](https://answers.mindstick.com/qa/113578/what-is-the-process-for-startup-india-registration) or program structure should I check when making multiprocessing code portable across both systems? I’m trying to understand the cause rather than just patch this one script.


---

Original Source: https://answers.mindstick.com/qa/118125/why-does-python-multiprocessing-behave-differently-on-windows-and-linux

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