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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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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
cannam@127 9
cannam@127 10 Permission is granted to make and distribute verbatim copies of this
cannam@127 11 manual provided the copyright notice and this permission notice are
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cannam@127 14 Permission is granted to copy and distribute modified versions of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Installation and Supported Hardware/Software</title>
cannam@127 26
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cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Installation-and-Supported-Hardware_002fSoftware"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 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>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Installation-and-Supported-Hardware_002fSoftware-1"></a>
cannam@127 79 <h3 class="section">5.1 Installation and Supported Hardware/Software</h3>
cannam@127 80
cannam@127 81 <p>All of the FFTW threads code is located in the <code>threads</code>
cannam@127 82 subdirectory of the FFTW package. On Unix systems, the FFTW threads
cannam@127 83 libraries and header files can be automatically configured, compiled,
cannam@127 84 and installed along with the uniprocessor FFTW libraries simply by
cannam@127 85 including <code>--enable-threads</code> in the flags to the <code>configure</code>
cannam@127 86 script (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>), or <code>--enable-openmp</code> to use
cannam@127 87 <a href="http://www.openmp.org">OpenMP</a> threads.
cannam@127 88 <a name="index-configure"></a>
cannam@127 89 </p>
cannam@127 90
cannam@127 91 <a name="index-portability-3"></a>
cannam@127 92 <a name="index-OpenMP"></a>
cannam@127 93 <p>The threads routines require your operating system to have some sort
cannam@127 94 of shared-memory threads support. Specifically, the FFTW threads
cannam@127 95 package works with POSIX threads (available on most Unix variants,
cannam@127 96 from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which
cannam@127 97 are supported in many common compilers (e.g. gcc) are also supported,
cannam@127 98 and may give better performance on some systems. (OpenMP threads are
cannam@127 99 also useful if you are employing OpenMP in your own code, in order to
cannam@127 100 minimize conflicts between threading models.) If you have a
cannam@127 101 shared-memory machine that uses a different threads API, it should be
cannam@127 102 a simple matter of programming to include support for it; see the file
cannam@127 103 <code>threads/threads.c</code> for more detail.
cannam@127 104 </p>
cannam@127 105 <p>You can compile FFTW with <em>both</em> <code>--enable-threads</code> and
cannam@127 106 <code>--enable-openmp</code> at the same time, since they install libraries
cannam@127 107 with different names (&lsquo;<samp>fftw3_threads</samp>&rsquo; and &lsquo;<samp>fftw3_omp</samp>&rsquo;, as
cannam@127 108 described below). However, your programs may only link to <em>one</em>
cannam@127 109 of these two libraries at a time.
cannam@127 110 </p>
cannam@127 111 <p>Ideally, of course, you should also have multiple processors in order to
cannam@127 112 get any benefit from the threaded transforms.
cannam@127 113 </p>
cannam@127 114
cannam@127 115
cannam@127 116
cannam@127 117 </body>
cannam@127 118 </html>