Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

Real MPI FFTW

Real-to-Complex MPI FFTW Transforms

rfftwnd_mpi_plan rfftw2d_mpi_create_plan(MPI_Comm
comm
, int
nx
, int
ny
, fftw_direction
dir
, int
flags
);
rfftwnd_mpi_plan rfftw3d_mpi_create_plan(MPI_Comm
comm
, int
nx
, int
ny
, int
nz
, fftw_direction
dir
, int
flags
);
rfftwnd_mpi_plan rfftwnd_mpi_create_plan(MPI_Comm
comm
, int
dim
, int
*n
, fftw_direction
dir
, int
flags
);
void rfftwnd_mpi(rfftwnd_mpi_plan
p
, int
n_fields
, fftw_real
*local_data
, fftw_real
*work
, fftwnd_mpi_output_order
output_order
);
void rfftwnd_mpi_local_sizes(rfftwnd_mpi_plan
p
, int
*local_nx
, int
*local_x_start
, int
*local_ny_after_transpose
, int
*local_y_start_after_transpose
, int
*total_local_size
);
void rfftwnd_mpi_destroy_plan(rfftwnd_mpi_plan
plan
);
Argument restrictions
:
  • Supported values of
    flags
     are
    FFTW_ESTIMATE
     and
    FFTW_MEASURE
    . If any other value of
    flags
     is supplied, the wrapper library reports an error '
    CDFT error in wrapper: unknown flags
    '.
  • The only supported value of
    n_fields
     is 1.
  • Function
    rfftwnd_mpi_create_plan
     can be used for both one-dimensional and multi-dimensional transforms.
  • Both values of the
    output_order
     parameter are supported:
    FFTW_NORMAL_ORDER
     and
    FFTW_TRANSPOSED_ORDER
    .

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.