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author Chris Cannam
date Wed, 07 Sep 2016 10:40:32 +0100
parents 26056e866c29
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Chris@19 1 <html lang="en">
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Chris@19 3 <title>Installation and Supported Hardware/Software - FFTW 3.3.4</title>
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Chris@19 12 <!--
Chris@19 13 This manual is for FFTW
Chris@19 14 (version 3.3.4, 20 September 2013).
Chris@19 15
Chris@19 16 Copyright (C) 2003 Matteo Frigo.
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Chris@19 18 Copyright (C) 2003 Massachusetts Institute of Technology.
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Chris@19 20 Permission is granted to make and distribute verbatim copies of
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Chris@19 22 notice are preserved on all copies.
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Chris@19 25 this manual under the conditions for verbatim copying, provided
Chris@19 26 that the entire resulting derived work is distributed under the
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Chris@19 29 Permission is granted to copy and distribute translations of this
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Chris@19 48 <div class="node">
Chris@19 49 <a name="Installation-and-Supported-Hardware%2fSoftware"></a>
Chris@19 50 <a name="Installation-and-Supported-Hardware_002fSoftware"></a>
Chris@19 51 <p>
Chris@19 52 Next:&nbsp;<a rel="next" accesskey="n" href="Usage-of-Multi_002dthreaded-FFTW.html#Usage-of-Multi_002dthreaded-FFTW">Usage of Multi-threaded FFTW</a>,
Chris@19 53 Previous:&nbsp;<a rel="previous" accesskey="p" href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW">Multi-threaded FFTW</a>,
Chris@19 54 Up:&nbsp;<a rel="up" accesskey="u" href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW">Multi-threaded FFTW</a>
Chris@19 55 <hr>
Chris@19 56 </div>
Chris@19 57
Chris@19 58 <h3 class="section">5.1 Installation and Supported Hardware/Software</h3>
Chris@19 59
Chris@19 60 <p>All of the FFTW threads code is located in the <code>threads</code>
Chris@19 61 subdirectory of the FFTW package. On Unix systems, the FFTW threads
Chris@19 62 libraries and header files can be automatically configured, compiled,
Chris@19 63 and installed along with the uniprocessor FFTW libraries simply by
Chris@19 64 including <code>--enable-threads</code> in the flags to the <code>configure</code>
Chris@19 65 script (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>), or <code>--enable-openmp</code> to use
Chris@19 66 <a href="http://www.openmp.org">OpenMP</a> threads.
Chris@19 67 <a name="index-configure-332"></a>
Chris@19 68
Chris@19 69 <p><a name="index-portability-333"></a><a name="index-OpenMP-334"></a>The threads routines require your operating system to have some sort
Chris@19 70 of shared-memory threads support. Specifically, the FFTW threads
Chris@19 71 package works with POSIX threads (available on most Unix variants,
Chris@19 72 from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which
Chris@19 73 are supported in many common compilers (e.g. gcc) are also supported,
Chris@19 74 and may give better performance on some systems. (OpenMP threads are
Chris@19 75 also useful if you are employing OpenMP in your own code, in order to
Chris@19 76 minimize conflicts between threading models.) If you have a
Chris@19 77 shared-memory machine that uses a different threads API, it should be
Chris@19 78 a simple matter of programming to include support for it; see the file
Chris@19 79 <code>threads/threads.c</code> for more detail.
Chris@19 80
Chris@19 81 <p>You can compile FFTW with <em>both</em> <code>--enable-threads</code> and
Chris@19 82 <code>--enable-openmp</code> at the same time, since they install libraries
Chris@19 83 with different names (&lsquo;<samp><span class="samp">fftw3_threads</span></samp>&rsquo; and &lsquo;<samp><span class="samp">fftw3_omp</span></samp>&rsquo;, as
Chris@19 84 described below). However, your programs may only link to <em>one</em>
Chris@19 85 of these two libraries at a time.
Chris@19 86
Chris@19 87 <p>Ideally, of course, you should also have multiple processors in order to
Chris@19 88 get any benefit from the threaded transforms.
Chris@19 89
Chris@19 90 <!-- -->
Chris@19 91 </body></html>
Chris@19 92