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cannam@127:Before calling any other FFTW MPI (‘fftw_mpi_’) function, and cannam@127: before importing any wisdom for MPI problems, you must call: cannam@127:
cannam@127: cannam@127:void fftw_mpi_init(void); cannam@127:
If FFTW threads support is used, however, fftw_mpi_init should
cannam@127: be called after fftw_init_threads (see Combining MPI and Threads). Calling fftw_mpi_init additional times (before
cannam@127: fftw_mpi_cleanup) has no effect.
cannam@127:
If you want to deallocate all persistent data and reset FFTW to the cannam@127: pristine state it was in when you started your program, you can call: cannam@127:
cannam@127: cannam@127:void fftw_mpi_cleanup(void); cannam@127:
(This calls fftw_cleanup, so you need not call the serial
cannam@127: cleanup routine too, although it is safe to do so.) After calling
cannam@127: fftw_mpi_cleanup, all existing plans become undefined, and you
cannam@127: should not attempt to execute or destroy them. You must call
cannam@127: fftw_mpi_init again after fftw_mpi_cleanup if you want
cannam@127: to resume using the MPI FFTW routines.
cannam@127: