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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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3 <!-- This manual is for FFTW
4 (version 3.3.5, 30 July 2016).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
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10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
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25 <title>FFTW 3.3.5: Installation and Supported Hardware/Software</title>
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72 <a name="Installation-and-Supported-Hardware_002fSoftware"></a>
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74 <p>
75 Next: <a href="Usage-of-Multi_002dthreaded-FFTW.html#Usage-of-Multi_002dthreaded-FFTW" accesskey="n" rel="next">Usage of Multi-threaded FFTW</a>, Previous: <a href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW" accesskey="p" rel="prev">Multi-threaded FFTW</a>, Up: <a href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW" accesskey="u" rel="up">Multi-threaded FFTW</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>
76 </div>
77 <hr>
78 <a name="Installation-and-Supported-Hardware_002fSoftware-1"></a>
79 <h3 class="section">5.1 Installation and Supported Hardware/Software</h3>
80
81 <p>All of the FFTW threads code is located in the <code>threads</code>
82 subdirectory of the FFTW package. On Unix systems, the FFTW threads
83 libraries and header files can be automatically configured, compiled,
84 and installed along with the uniprocessor FFTW libraries simply by
85 including <code>--enable-threads</code> in the flags to the <code>configure</code>
86 script (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>), or <code>--enable-openmp</code> to use
87 <a href="http://www.openmp.org">OpenMP</a> threads.
88 <a name="index-configure"></a>
89 </p>
90
91 <a name="index-portability-3"></a>
92 <a name="index-OpenMP"></a>
93 <p>The threads routines require your operating system to have some sort
94 of shared-memory threads support. Specifically, the FFTW threads
95 package works with POSIX threads (available on most Unix variants,
96 from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which
97 are supported in many common compilers (e.g. gcc) are also supported,
98 and may give better performance on some systems. (OpenMP threads are
99 also useful if you are employing OpenMP in your own code, in order to
100 minimize conflicts between threading models.) If you have a
101 shared-memory machine that uses a different threads API, it should be
102 a simple matter of programming to include support for it; see the file
103 <code>threads/threads.c</code> for more detail.
104 </p>
105 <p>You can compile FFTW with <em>both</em> <code>--enable-threads</code> and
106 <code>--enable-openmp</code> at the same time, since they install libraries
107 with different names (&lsquo;<samp>fftw3_threads</samp>&rsquo; and &lsquo;<samp>fftw3_omp</samp>&rsquo;, as
108 described below). However, your programs may only link to <em>one</em>
109 of these two libraries at a time.
110 </p>
111 <p>Ideally, of course, you should also have multiple processors in order to
112 get any benefit from the threaded transforms.
113 </p>
114
115
116
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