A Python implementation of spectral deferred correction methods and the likes
Welcome to pySDC!
pySDC project is a Python implementation of the
spectral deferred correction (SDC) approach and its flavors, esp. the
multilevel extension MLSDC and PFASST. It is intended for rapid
prototyping and educational purposes. New ideas like e.g. sweepers or
predictors can be tested and first toy problems can be easily
- Variants of SDC: explicit, implicit, IMEX, multi-implicit, Verlet, multi-level, diagonal, multi-step
- Variants of PFASST: virtual parallel or MPI-based parallel, classical of multigrid perspective
- 8 tutorials: from setting up a first collocation problem to SDC, PFASST and advanced topics
- Projects: many documented projects with defined and tested outcomes
- Many different examples, collocation types, data types already implemented
- Works with FEniCS, mpi4py-fft and PETSc (through petsc4py)
- Continuous integration via GitHub Actions and Gitlab CI
- Fully compatible with Python 3.7 - 3.10, runs at least on Ubuntu and MacOS
The code is hosted on GitHub, see
https://github.com/Parallel-in-Time/pySDC, and PyPI, see
https://pypi.python.org/pypi/pySDC. While using
pip install pySDC
will give you a core version of
pySDC to work with,
working with the developer version is most often the better choice. We
thus recommend to checkout the code from GitHub and install the
dependencies e.g. by using a conda
environment. For this,
pySDC ships with environment files
which can be found in the folder
etc/. Use these as e.g.
conda env create -f etc/environment-base.yml
To check your installation, run
pytest pySDC/tests -m NAME
NAME corresponds to the environment you chose (
base in the
example above). You may need to update your
PYTHONPATH by running
in particular if you want to run any of the playgrounds, projects or
import statements there assume that the
pySDC's base directory is part of
For many examples,
LaTeX is used for the plots, i.e. a
decent installation of this is needed in order to run those examples.
petsc4py, a C++
compiler is required (although installation may go through at first).
For more details on
pySDC, check out http://www.parallel-in-time.org/pySDC.
How to cite
If you use pySDC or parts of it for your work, great! Let us know if we can help you with this. Also, we would greatly appreciate a citation of this paper:
Robert Speck, Algorithm 997: pySDC - Prototyping Spectral Deferred Corrections, ACM Transactions on Mathematical Software (TOMS), Volume 45 Issue 3, August 2019, https://doi.org/10.1145/3310410
The current software release can be cited using Zenodo:
pySDC code was originally developed by Robert Speck (@pancetta),
and is now maintained and developed by a small community of scientists interested in SDC methods.
Checkout the Changelog to see pySDC's evolution since 2016.
Any contribution is dearly welcome ! If you want to take part of this, please take the time to read our Contribution Guidelines (and don't forget to take a pick at our nice Code of Conduct :wink:).
This project has received funding from the European High-Performance Computing Joint Undertaking (JU) under grant agreement No 955701 (TIME-X). The JU receives support from the European Union's Horizon 2020 research and innovation programme and Belgium, France, Germany, and Switzerland. This project also received funding from the German Federal Ministry of Education and Research (BMBF) grant 16HPC047. The project also received help from the Helmholtz Platform for Research Software Engineering - Preparatory Study (HiRSE_PS).
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