Skip to content
Switch branches/tags

Latest commit

* reuse sort by perm code

* try some optimizations

* fix int size in sort

* more improvements

* Fix int compare

* improve sort by perm

* remove some timers

* remove unused code

* fix test

* revert default

* fix tests

* fix test for mixed topologies

* fix loop range

* Remove some includes

* Minor edits

Co-authored-by: Garth N. Wells <>


Failed to load latest commit information.


DOLFINx CI CircleCI Actions Docker environment images Actions Docker image builds Actions Spack build

DOLFINx is a new version of DOLFIN. It is being actively developed and features may come and go as development proceeds.

DOLFINx is the computational environment of FEniCS and implements the FEniCS Problem Solving Environment in Python and C++.


Documentation can be viewed at:


From source

C++ core

To build and install the C++ core, in the cpp/ directory, run::

mkdir build
cd build
cmake ..
make install

Python interface

To install the Python interface, first install the C++ core, and then in the python/ directory run::

pip install .

(you may need to use pip3, depending on your system).

For detailed instructions, see the file INSTALL.


To build from source using Spack (assuming a bash shell):

git clone
. ./spack/share/spack/
spack env create fenicsx-env
spack env activate fenicsx-env
echo "  concretization: together" >> ./spack/var/spack/environments/fenicsx-env/spack.yaml
spack add py-fenics-dolfinx@main ^petsc+mumps+hypre cflags="-O3" fflags="-O3"
spack install

See the Spack documentation for comprehensive instructions.

Docker images

A Docker image with DOLFINx built nightly:

docker run -ti dolfinx/dolfinx:latest

To switch between real and complex builds of DOLFINx.

source /usr/local/bin/dolfinx-complex-mode
source /usr/local/bin/dolfinx-real-mode

A Jupyter Lab environment with DOLFINx built nightly:

docker run --init -ti -p 8888:8888 dolfinx/lab:latest # Access at http://localhost:8888

A development image with all of the dependencies required to build DOLFINx:

docker run -ti dolfinx/dev-env:latest

All Docker images support arm64 and amd64 architectures.

For more information, see


DOLFINx is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

DOLFINx is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with DOLFINx. If not, see


For questions about using DOLFINx, visit the FEniCS Discourse page:

For bug reports, visit the DOLFINx GitHub page:

For comments and requests, send an email to the FEniCS mailing list:

For questions related to obtaining, building or installing DOLFINx, send an email to the FEniCS support mailing list: