juFFTe¶

juFFTe is a modern Fast Fourier Transform library written in Fortran 2003, inspired by the FFTE library.

Features¶

1D, 2D, and 3D FFTs - Complex-to-complex, real-to-complex, and complex-to-real transforms
FFTW compatibility - Drop-in replacement for FFTW with familiar API
OpenMP parallelization - Multi-core performance out of the box
Multiple backends - Standard, Spiral (optimized kernels), SVE, and RVV support
Modern Fortran - Clean, maintainable codebase using Fortran 2003+

Quick Start¶

Installation¶

# Using Make
cd src
make
make install PREFIX=/your/installation/folder

# Using CMake
cd src && mkdir build && cd build
cmake ..
make install

First FFT¶

program example
    use juffte
    use iso_fortran_env
    implicit none

    complex(real64), allocatable :: data(:)
    integer :: n

    n = 1024
    allocate(data(n))

    ! Initialize FFT tables
    call zfft1d(data, n, juffte_init)

    ! Forward transform
    call zfft1d(data, n, juffte_fw)

    ! Backward transform
    call zfft1d(data, n, juffte_bw)

    deallocate(data)
end program example

Build with juFFTe¶

Link against the library:

gfortran -fopenmp your_code.f90 -ljuffte -L/path/to/juffte/lib -I/path/to/juffte/include

For C/C++ programs:

gcc your_code.c -ljuffte -lgfortran -lm -L/path/to/juffte/lib -I/path/to/juffte/include

License¶

juFFTe is licensed under the Apache License 2.0. See the LICENSE file for details.

Contributing¶

Contributions are welcome! Please see CONTRIBUTING for guidelines.

Credits¶

juFFTe is developed at Jülich Supercomputing Centre (JSC) and other juFFTe developers.