Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

Complex MPI FFTW

Complex One-dimensional MPI FFTW Transforms

fftw_mpi_plan fftw_mpi_create_plan(MPI_Comm
comm
, int
n
, fftw_direction
dir
, int
flags
);
void fftw_mpi(fftw_mpi_plan
p
, int
n_fields
, fftw_complex
*local_data
, fftw_complex
*work
);
void fftw_mpi_local_sizes(fftw_mpi_plan
p
, int
*local_n
, int
*local_start
, int
*local_n_after_transform
, int
*local_start_after_transform
, int
*total_local_size
);
void fftw_mpi_destroy_plan(fftw_mpi_plan
plan
);
Argument restrictions
:
  • Supported values of
    flags
     are
    FFTW_ESTIMATE, FFTW_MEASURE, FFTW_SCRAMBLED_INPUT
     and
    FFTW_SCRAMBLED_OUTPUT
    . The same algorithm corresponds to all these values of the flags parameter. If any other
    flags
     value is supplied, the wrapper library reports an error '
    CDFT error in wrapper: unknown flags
    '.
  • The only supported value of
    n_fields
     is 1.

Complex Multi-dimensional MPI FFTW Transforms

fftwnd_mpi_plan fftw2d_mpi_create_plan(MPI_Comm
comm
, int
nx
, int
ny
, fftw_direction
dir
, int
flags
);
fftwnd_mpi_plan fftw3d_mpi_create_plan(MPI_Comm
comm
, int
nx
, int
ny
, int
nz
, fftw_direction
dir
, int
flags
);
fftwnd_mpi_plan fftwnd_mpi_create_plan(MPI_Comm
comm
, int
dim
, int
*n
, fftw_direction
dir
, int
flags
);
void fftwnd_mpi(fftwnd_mpi_plan
p
, int
n_fields
, fftw_complex
*local_data
, fftw_complex
*work
, fftwnd_mpi_output_order
output_order
);
void fftwnd_mpi_local_sizes(fftwnd_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 fftwnd_mpi_destroy_plan(fftwnd_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.

Product and Performance Information

1

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