Gain insights into Python's scalability, concurrency, and distribution. Learn about CPU scaling, event loops, queue-based distribution, and building REST APIs to optimize and deploy high-performance applications.

python.tar.gz

Chapter2

Chapter7

Chapter5

Chapter6

Chapter3

Chapter7-without-etcd

Chapter8-with-etcd

Chapter9

Chapter9-gabbi

Chapter10-heroku

Chapter10-aws_eb

Chapter11_Tox_integration

Chapter11_Tox_integration-pifpaf

Chapter11_pifpaf_fixtures

Chapter12_caching

Chapter13_Performance

Chapter13_Performace_KCacheGrind

Chapter5-rq-dashboard

Chapter5-celery-flower

Chapter10-gcloud

Chapter2-zsh

Chapter13_Performace_KCacheGrind-copy

Chapter11_Tox_integration-pifpaf-postgresql

Celery-Project1_Sol

Celery-Project1_Sol2

Python, in all of its greatness, is often dismissed when needing to write performant and distributed applications. It’s considered to be slow and not suited for the task. In this course, you will find that with the right implementation of Python, you can write applications that scale horizontally, perform well, and are distributed. 

To kick things off, you’ll learn about CPU scaling, concurrency, and event loops, all of which are crucial for implementing a distributed system. After that, you’ll move on to queue-based distribution, lock management, and group memberships, which are fundamental concepts for maintaining availability and consistency in distributed applications.

In the last half, you’ll learn how to build a REST API, how to deploy your app to a PaaS, and how to optimize your application's performance.

By the end of this course, you’ll be more productive with Python, you’ll be able to write faster applications that are distributed, and you’ll have a great new skill that is highly coveted.

The Hacker's Guide to Scaling Python

As stated earlier, `multiprocessing.Lock` only works for processes started from a single Python process. If your application is distributed across several Python processes, such as a daemon started independently, you need an _interprocess lock_ mechanism.

Those locks are usually not portable across operating systems. POSIX, System V or even Windows all offer different interprocess communication mechanisms, and they are not compatible with one another. You may want to look in this direction if you are not afraid of making your software platform-dependent.

# `fasteners`

The `fasteners` module provides an excellent implementation of a generic solution based on file locks in Python.

> **Note:** Locks implemented by `fasteners` are based on file-system locks. They are not specific to Python. Therefore you could also implement the same file-locking mechanism in another programming language in order to have cross-language locking.

_Fasteners_ provides a lock class `fasteners.InterProcessLock` that takes a file path as its first argument. This file path is going to be the identifier for this lock, and it can be used across multiple independent processes. This is why _fasteners_ is helpful to lock access to resources across processes that were started independently.

> To run the application below, press the **Run** button and run the command `python fasteners-lock.py`.

Learn about inter-processes locks in Python.

Processes Locks: Inter-Processes Locks

Scaling

CPU Scaling

Event Loops

Functional Programming

Queue-Based Distribution

Designing for Failure

Create a Web Crawler

Project Walkthrough

Lock Management

Group Membership

REST Interfaces

Deploying on PaaS

Testing Distributed Systems

Caching

Performance

Conclusion

Processes Locks: Inter-Processes Locks