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.. include:: header.rst
.. _RecipesMultiprocessing:
==============================
Recipes: Multiprocessing
==============================
MuPDF has no integrated support for threading - they call themselves "threading-agnostic". While there do exist tricky possibilities to still use threading with MuPDF, the baseline consequence for **PyMuPDF** is:
**No Python threading support**.
Using PyMuPDF in a Python threading environment will lead to blocking effects for the main thread.
However, there is the option to use Python's *multiprocessing* module in a variety of ways.
If you are looking to speed up page-oriented processing for a large document, use this script as a starting point. It should be at least twice as fast as the corresponding sequential processing.
.. literalinclude:: samples/multiprocess-render.py
:language: python
Here is a more complex example involving inter-process communication between a main process (showing a GUI) and a child process doing PyMuPDF access to a document.
.. literalinclude:: samples/multiprocess-gui.py
:language: python
.. include:: footer.rst
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