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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <!-- This manual is for FFTW
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4 (version 3.3.5, 30 July 2016).
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5
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6 Copyright (C) 2003 Matteo Frigo.
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7
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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9
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10 Permission is granted to make and distribute verbatim copies of this
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11 manual provided the copyright notice and this permission notice are
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12 preserved on all copies.
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13
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14 Permission is granted to copy and distribute modified versions of this
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15 manual under the conditions for verbatim copying, provided that the
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16 entire resulting derived work is distributed under the terms of a
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17 permission notice identical to this one.
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18
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19 Permission is granted to copy and distribute translations of this manual
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20 into another language, under the above conditions for modified versions,
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21 except that this permission notice may be stated in a translation
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22 approved by the Free Software Foundation. -->
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23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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24 <head>
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25 <title>FFTW 3.3.5: Installation and Supported Hardware/Software</title>
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26
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27 <meta name="description" content="FFTW 3.3.5: Installation and Supported Hardware/Software">
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28 <meta name="keywords" content="FFTW 3.3.5: Installation and Supported Hardware/Software">
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33 <link href="index.html#Top" rel="start" title="Top">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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36 <link href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW" rel="up" title="Multi-threaded FFTW">
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37 <link href="Usage-of-Multi_002dthreaded-FFTW.html#Usage-of-Multi_002dthreaded-FFTW" rel="next" title="Usage of Multi-threaded FFTW">
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38 <link href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW" rel="prev" title="Multi-threaded FFTW">
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64 ul.no-bullet {list-style: none}
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65 -->
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66 </style>
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67
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68
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69 </head>
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70
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71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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72 <a name="Installation-and-Supported-Hardware_002fSoftware"></a>
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73 <div class="header">
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74 <p>
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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> [<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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76 </div>
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77 <hr>
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78 <a name="Installation-and-Supported-Hardware_002fSoftware-1"></a>
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79 <h3 class="section">5.1 Installation and Supported Hardware/Software</h3>
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80
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81 <p>All of the FFTW threads code is located in the <code>threads</code>
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82 subdirectory of the FFTW package. On Unix systems, the FFTW threads
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83 libraries and header files can be automatically configured, compiled,
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84 and installed along with the uniprocessor FFTW libraries simply by
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85 including <code>--enable-threads</code> in the flags to the <code>configure</code>
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86 script (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>), or <code>--enable-openmp</code> to use
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87 <a href="http://www.openmp.org">OpenMP</a> threads.
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88 <a name="index-configure"></a>
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89 </p>
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90
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91 <a name="index-portability-3"></a>
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92 <a name="index-OpenMP"></a>
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93 <p>The threads routines require your operating system to have some sort
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94 of shared-memory threads support. Specifically, the FFTW threads
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95 package works with POSIX threads (available on most Unix variants,
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96 from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which
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97 are supported in many common compilers (e.g. gcc) are also supported,
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98 and may give better performance on some systems. (OpenMP threads are
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99 also useful if you are employing OpenMP in your own code, in order to
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100 minimize conflicts between threading models.) If you have a
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101 shared-memory machine that uses a different threads API, it should be
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102 a simple matter of programming to include support for it; see the file
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103 <code>threads/threads.c</code> for more detail.
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104 </p>
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105 <p>You can compile FFTW with <em>both</em> <code>--enable-threads</code> and
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106 <code>--enable-openmp</code> at the same time, since they install libraries
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107 with different names (‘<samp>fftw3_threads</samp>’ and ‘<samp>fftw3_omp</samp>’, as
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108 described below). However, your programs may only link to <em>one</em>
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109 of these two libraries at a time.
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110 </p>
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111 <p>Ideally, of course, you should also have multiple processors in order to
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112 get any benefit from the threaded transforms.
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113 </p>
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114
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115
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116
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117 </body>
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118 </html>
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