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Before calling any other FFTW MPI (‘fftw_mpi_’) function, and before importing any wisdom for MPI problems, you must call:
If FFTW threads support is used, however,
be called after
fftw_init_threads (see 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:
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.