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spectral.rst

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Building the spectral solver

By default, the code is compiled with a finite-difference (FDTD) Maxwell solver. In order to run the code with a spectral solver, you need to:

  • Install (or load) an MPI-enabled version of FFTW. For instance, for Debian, this can be done with :

    apt-get install libfftw3-dev libfftw3-mpi-dev

  • Set the environment variable FFTW_HOME to the path for FFTW. For instance, for Debian, this is done with :

    export FFTW_HOME=/usr/

  • Set USE_PSATD=TRUE when compiling: :

    make -j 4 USE_PSATD=TRUE

See rzgeometry for using the spectral solver with USE_RZ. Additional steps are needed. PSATD is compatible with single precision, but please note that, on CPU, FFTW needs to be compiled with option --enable-float.