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IPython Interactive Computing and Visualization Cookbook

IPython Interactive Computing and Visualization Cookbook

By : Cyrille Rossant
4.5 (13)
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IPython Interactive Computing and Visualization Cookbook

IPython Interactive Computing and Visualization Cookbook

4.5 (13)
By: Cyrille Rossant

Overview of this book

Intended to anyone interested in numerical computing and data science: students, researchers, teachers, engineers, analysts, hobbyists... Basic knowledge of Python/NumPy is recommended. Some skills in mathematics will help you understand the theory behind the computational methods.
Table of Contents (22 chapters)
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IPython Interactive Computing and Visualization Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Distributing Python code across multiple cores with IPython


Despite CPython's GIL, it is possible to execute several tasks in parallel on multi-core computers using multiple processes instead of multiple threads. Python offers a native multiprocessing module. IPython offers an even simpler interface that brings powerful parallel computing features in an interactive environment. We will describe this tool here.

How to do it…

  1. First, we launch four IPython engines in separate processes. We have basically two options to do this:

    • Executing ipcluster start -n 4 in a system shell

    • Using the web interface provided in the IPython notebook's main page by clicking on the Clusters tab and launching four engines

  2. Then, we create a client that will act as a proxy to the IPython engines. The client automatically detects the running engines:

    In [2]: from IPython.parallel import Client
            rc = Client()
  3. Let's check the number of running engines:

    In [3]: rc.ids
    Out[3]: [0, 1, 2, 3]
  4. To run commands in parallel over...

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