220.127.116.11. Fastest Fourier Transform in the West (FFTW)
The spectral solver as well as some pre and post processing tools use Fast Fourier Transforms (FFT).
The library used is the »Fastest Fourier Transform in the West
FFTW is free software, released under the GNU General Public License.
DAMASK requires FFTW version 3.3 or later
There are 3 ways how to install FFTW.
FFTW is generally available as a package on Unix-based operating systems.
However, the MPI version must be available to compile the current DAMASK version.
This is not the case for Ubuntu 16.04, where only the serial version is available as a package.
Ubuntu 18.04 packages
Automated installation by PETSc
PETSc offers the possibility to download, configure, and install FFTW.
See the PETSc manual
for further instructions.
Compile from source
If there is a need to compile FFTW on your own machine, download the sources from www.fftw.org/download
and follow the instructions on www.fftw.org#documentation
The C compiler should match the vendor of the Fortran compiler
FFTW must be build with MPI support.
Suitable options are
--enable-mpi --enable-sse2 --enable-avx --enable-shared --disable-fortran
The required library files are called libfftw3.a
, and libfftw3_mpi.la
- Libraries are missing (using a distribution package)
Install the developer version as well (i.e. on Ubuntu 18.04 libfftw3-dev and libfftw3-mpi3-dev)
- Cannot find fftw_alloc_complex
Most probably you're using an older version of FFTW without the Fortran 2003 interface. Update your FFTW to 3.3.x