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cannam@167: (version 3.3.8, 24 May 2018).
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cannam@167: <title>FFTW 3.3.8: Installation and Supported Hardware/Software</title>
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cannam@167: <a name="Installation-and-Supported-Hardware_002fSoftware-1"></a>
cannam@167: <h3 class="section">5.1 Installation and Supported Hardware/Software</h3>
cannam@167:
cannam@167: <p>All of the FFTW threads code is located in the <code>threads</code>
cannam@167: subdirectory of the FFTW package. On Unix systems, the FFTW threads
cannam@167: libraries and header files can be automatically configured, compiled,
cannam@167: and installed along with the uniprocessor FFTW libraries simply by
cannam@167: including <code>--enable-threads</code> in the flags to the <code>configure</code>
cannam@167: script (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>), or <code>--enable-openmp</code> to use
cannam@167: <a href="http://www.openmp.org">OpenMP</a> threads.
cannam@167: <a name="index-configure"></a>
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cannam@167:
cannam@167: <a name="index-portability-3"></a>
cannam@167: <a name="index-OpenMP"></a>
cannam@167: <p>The threads routines require your operating system to have some sort
cannam@167: of shared-memory threads support. Specifically, the FFTW threads
cannam@167: package works with POSIX threads (available on most Unix variants,
cannam@167: from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which
cannam@167: are supported in many common compilers (e.g. gcc) are also supported,
cannam@167: and may give better performance on some systems. (OpenMP threads are
cannam@167: also useful if you are employing OpenMP in your own code, in order to
cannam@167: minimize conflicts between threading models.) If you have a
cannam@167: shared-memory machine that uses a different threads API, it should be
cannam@167: a simple matter of programming to include support for it; see the file
cannam@167: <code>threads/threads.c</code> for more detail.
cannam@167: </p>
cannam@167: <p>You can compile FFTW with <em>both</em> <code>--enable-threads</code> and
cannam@167: <code>--enable-openmp</code> at the same time, since they install libraries
cannam@167: with different names (‘<samp>fftw3_threads</samp>’ and ‘<samp>fftw3_omp</samp>’, as
cannam@167: described below). However, your programs may only link to <em>one</em>
cannam@167: of these two libraries at a time.
cannam@167: </p>
cannam@167: <p>Ideally, of course, you should also have multiple processors in order to
cannam@167: get any benefit from the threaded transforms.
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