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author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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72 <a name="Wisdom-Utilities"></a>
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74 <p>
75 Previous: <a href="Forgetting-Wisdom.html#Forgetting-Wisdom" accesskey="p" rel="prev">Forgetting Wisdom</a>, Up: <a href="Wisdom.html#Wisdom" accesskey="u" rel="up">Wisdom</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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77 <hr>
78 <a name="Wisdom-Utilities-1"></a>
79 <h4 class="subsection">4.7.4 Wisdom Utilities</h4>
80
81 <p>FFTW includes two standalone utility programs that deal with wisdom. We
82 merely summarize them here, since they come with their own <code>man</code>
83 pages for Unix and GNU systems (with HTML versions on our web site).
84 </p>
85 <p>The first program is <code>fftw-wisdom</code> (or <code>fftwf-wisdom</code> in
86 single precision, etcetera), which can be used to create a wisdom file
87 containing plans for any of the transform sizes and types supported by
88 FFTW. It is preferable to create wisdom directly from your executable
89 (see <a href="Caveats-in-Using-Wisdom.html#Caveats-in-Using-Wisdom">Caveats in Using Wisdom</a>), but this program is useful for
90 creating global wisdom files for <code>fftw_import_system_wisdom</code>.
91 <a name="index-fftw_002dwisdom-utility-1"></a>
92 </p>
93
94 <p>The second program is <code>fftw-wisdom-to-conf</code>, which takes a wisdom
95 file as input and produces a <em>configuration routine</em> as output. The
96 latter is a C subroutine that you can compile and link into your
97 program, replacing a routine of the same name in the FFTW library, that
98 determines which parts of FFTW are callable by your program.
99 <code>fftw-wisdom-to-conf</code> produces a configuration routine that links
100 to only those parts of FFTW needed by the saved plans in the wisdom,
101 greatly reducing the size of statically linked executables (which should
102 only attempt to create plans corresponding to those in the wisdom,
103 however).
104 <a name="index-fftw_002dwisdom_002dto_002dconf-utility"></a>
105 <a name="index-configuration-routines"></a>
106 </p>
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