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FFTW is a Freely available high performance library to perform fast Fourier transformations.


FFTW (Fastest Fourier Transform in the West) is a high performance library to calculate discrete Fourier transformations. The library is freely available and typically easy to install, if it is not done by the HPC centre you are using.

The software is self optimising, trying several algorithms at run time and choosing the best performing one. To achieve its high computational speed latest version supports the SSE and AVX instructions of the latest x86-processors. The library provides a native C-API. In Fortran-2003 this is easily accessed using the C-bindings which are part of the language standard. For older versions of Fortran the library also contains a Fortran interface. To avoid data alignment issues, which could inhibit the performance, using the Fortran-2003 bindings to the C-API is encouraged.

The library contains parallel versions using either of pthreads, OpenMP or MPI. Besides the current version 3.x, there is the older version 2.x, which has a different application interfaces. It is not recommended to use version 2.x for new developments, however it is still widely used in legacy code.


License: Free.

GNU GPL version 2


AbiskoHPC2Ncapability resource of 153 TFLOPS with full bisectional infiniband interconnect
AlarikLUNARCthroughput cluster resource of 40 TFLOPS
AuroraLUNARCthroughput/general purpose cluster resource
PlatonLUNARCthroughput cluster resource of 26 TFLOPS