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fftw3: MPI Files and Data Types

 
 6.12.1 MPI Files and Data Types
 -------------------------------
 
 All programs using FFTW's MPI support should include its header file:
 
      #include <fftw3-mpi.h>
 
    Note that this header file includes the serial-FFTW 'fftw3.h' header
 file, and also the 'mpi.h' header file for MPI, so you need not include
 those files separately.
 
    You must also link to _both_ the FFTW MPI library and to the serial
 FFTW library.  On Unix, this means adding '-lfftw3_mpi -lfftw3 -lm' at
 the end of the link command.
 
    Different precisions are handled as in the serial interface: See
 Precision.  That is, 'fftw_' functions become 'fftwf_' (in single
 precision) etcetera, and the libraries become '-lfftw3f_mpi -lfftw3f
 -lm' etcetera on Unix.  Long-double precision is supported in MPI, but
 quad precision ('fftwq_') is not due to the lack of MPI support for this
 type.
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