Boost Python App Performance: Multiprocessing & Threading

Python is a versatile language that is widely used for various applications. However, one common concern is its performance, especially when dealing with resource-intensive tasks. In this article, we will explore how to boost your Python application's performance using multiprocessing and threading.

Table of Contents

  1. Understanding Concurrency, Parallelism, and GIL
  2. Python Threading Module
  3. Python Multiprocessing Module
  4. When to Use Threading or Multiprocessing
  5. Conclusion

Understanding Concurrency, Parallelism, and GIL

Before diving into the techniques, let's clarify some key concepts:

  • Concurrency: Multiple tasks being executed independently but not necessarily simultaneously.
  • Parallelism: Multiple tasks being executed simultaneously.
  • Global Interpreter Lock (GIL): A mechanism in CPython (Python's default interpreter) that synchronizes the execution of threads to prevent multiple native threads from executing Python bytecodes concurrently. This prevents parallelism in Python threads.

Python Threading Module

Threading is a technique that allows a program to execute multiple threads concurrently. In Python, the threading module provides a way to create and manage threads.

Creating Threads

To create a new thread, you can define a function and use the Thread class from the threading module:

import threading

def my_function():
    # Your code here

thread = threading.Thread(target=my_function)

Joining Threads

To wait for a thread to finish, you can use the join() method:


Example: Downloading Files

In this example, we will use threads to download multiple files concurrently:

import threading
import requests

def download_file(url, filename):
    response = requests.get(url)
    with open(filename, 'wb') as file:

urls = [

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