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Programs using the MPI FFTW routines should be linked with
-lfftw3_mpi -lfftw3 -lm
on Unix. You will also need to link
with whatever library is responsible for MPI on your system; in most
MPI implementations, there is a special compiler alias named
mpicc
to compile and link MPI code.
Before calling any FFTW routines, but after calling MPI_Init
,
you should call the function:
void fftw_mpi_init(void);
If, at the end of your program, you want to get rid of all memory and other resources allocated internally by FFTW, for both the serial and MPI routines, you can call:
void fftw_mpi_cleanup(void);
which is much like the fftw_cleanup()
function except that it
also gets rid of FFTW's MPI-related data. You must not execute
any previously created plans after calling this function.