cannam@167: Next: Using MPI Plans, Previous: MPI Files and Data Types, Up: FFTW MPI Reference [Contents][Index]
cannam@167:Before calling any other FFTW MPI (‘fftw_mpi_’) function, and cannam@167: before importing any wisdom for MPI problems, you must call: cannam@167:
cannam@167: cannam@167:void fftw_mpi_init(void); cannam@167:
If FFTW threads support is used, however, fftw_mpi_init should
cannam@167: be called after fftw_init_threads (see Combining MPI and Threads). Calling fftw_mpi_init additional times (before
cannam@167: fftw_mpi_cleanup) has no effect.
cannam@167:
If you want to deallocate all persistent data and reset FFTW to the cannam@167: pristine state it was in when you started your program, you can call: cannam@167:
cannam@167: cannam@167:void fftw_mpi_cleanup(void); cannam@167:
(This calls fftw_cleanup, so you need not call the serial
cannam@167: cleanup routine too, although it is safe to do so.) After calling
cannam@167: fftw_mpi_cleanup, all existing plans become undefined, and you
cannam@167: should not attempt to execute or destroy them. You must call
cannam@167: fftw_mpi_init again after fftw_mpi_cleanup if you want
cannam@167: to resume using the MPI FFTW routines.
cannam@167: