Provided by: libfftw3-dev_3.3-1ubuntu1_amd64 bug


       fftw-wisdom-to-conf - generate FFTW wisdom (pre-planned transforms)


       fftw-wisdom-to-conf [< INPUT] [> OUTPUT]


       fftw-wisdom-to-conf  is  a  utility  to generate C configuration routines from FFTW wisdom
       files, where the latter contain saved information about how to optimally compute (Fourier)
       transforms of various sizes.  A configuration routine is a C subroutine that you link into
       your program, replacing a routine of the same name in the FFTW  library,  that  determines
       which parts of FFTW are callable by your program.

       The  reason  to do this is that, if you only need transforms of a limited set of sizes and
       types, and if you are statically linking your program, then  using  a  configuration  file
       generated  from  wisdom  for  those  types  can  substantially  reduce  the  size  of your
       executable.  (Otherwise, because of FFTW's dynamic nature, all of  FFTW's  transform  code
       must be linked into any program using FFTW.)

       FFTW  is  a free library to compute discrete Fourier transforms in one or more dimensions,
       for arbitrary sizes, and of both real and complex data, among  other  related  operations.
       More information on FFTW can be found at the FFTW home page:

       fftw-wisdom-to-conf  reads  wisdom  from  standard  input  and writes the configuration to
       standard output.  It can easily be combined with the fftw-wisdom tool, for example:

       fftw-wisdom -n cof1024 cob1024 -o wisdom
       fftw-wisdom-to-conf < wisdom > conf.c

       will create a configuration "conf.c" containing only those parts of FFTW  needed  for  the
       optimized complex forwards and backwards out-of-place transforms of size 1024 (also saving
       the wisdom itself in "wisdom").

       Alternatively, you can run your actual program, export wisdom  for  all  plans  that  were
       created  (ideally  in  FFTW_PATIENT  or FFTW_EXHAUSTIVE mode), use this as input for fftw-
       wisdom-to-conf, and then re-link your program with the resulting configuration routine.

       Note that the configuration routine  does  not  contain  the  wisdom,  only  the  routines
       necessary  to implement the wisdom, so your program should also import the wisdom in order
       to benefit from the pre-optimized plans.


       -h, --help
              Display help on the command-line options and usage.

       -V, --version
              Print the version number and copyright information.


       Send bug reports to


       Written by Steven G. Johnson and Matteo Frigo.

       Copyright (c) 2003, 2007-11 Matteo Frigo
       Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology