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fftw3: MPI Initialization

 
 6.12.2 MPI Initialization
 -------------------------
 
 Before calling any other FFTW MPI ('fftw_mpi_') function, and before
 importing any wisdom for MPI problems, you must call:
 
      void fftw_mpi_init(void);
 
    If FFTW threads support is used, however, 'fftw_mpi_init' should be
 called _after_ 'fftw_init_threads' (Combining MPI and Threads).
 Calling 'fftw_mpi_init' additional times (before 'fftw_mpi_cleanup') has
 no effect.
 
    If you want to deallocate all persistent data and reset FFTW to the
 pristine state it was in when you started your program, you can call:
 
      void fftw_mpi_cleanup(void);
 
    (This calls 'fftw_cleanup', so you need not call the serial cleanup
 routine too, although it is safe to do so.)  After calling
 'fftw_mpi_cleanup', all existing plans become undefined, and you should
 not attempt to execute or destroy them.  You must call 'fftw_mpi_init'
 again after 'fftw_mpi_cleanup' if you want to resume using the MPI FFTW
 routines.
 

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