856 | | Furthermore, the fftw (see http://www.fftw.org ) can be used by setting '''fft_method''' = '' 'fftw' ''. This also requires to set the cpp-preprocessor switch {{{-D__fftw}}} in the {{{%cpp_options}}}-line of the configuration file, and to give the paths to the respective fftw include file and library by a {{{%fftw_inc}}} and {{{%fftw_lib}}} line, respectively. The fftw-routines are more than two times faster than the Temperton-fft. |
| 856 | Furthermore, the fftw (see http://www.fftw.org ) can be used by setting '''fft_method''' = '' 'fftw' ''. This also requires to set the cpp-preprocessor switch {{{-D__fftw}}} in the {{{%cpp_options}}}-line of the configuration file, and to give the paths to the respective fftw include file and library by a {{{%fftw_inc}}} and {{{%fftw_lib}}} line, respectively. The fftw-routines are more than two times faster than the Temperton-fft.\\ |
| 857 | Finally, '''fft_method''' can also be set to '' 'system-specific' '' to account for fft routines from IBM or NEC. This also requires to set the cpp-preprocessor switch {{{-D__ibm}}} or {{{-D__nec}}} in the {{{%cpp_options}}}-line of the configuration file |