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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.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Installation on Unix</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-on-Unix"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 Next: <a href="Installation-on-non_002dUnix-systems.html#Installation-on-non_002dUnix-systems" accesskey="n" rel="next">Installation on non-Unix systems</a>, Previous: <a href="Installation-and-Customization.html#Installation-and-Customization" accesskey="p" rel="prev">Installation and Customization</a>, Up: <a href="Installation-and-Customization.html#Installation-and-Customization" accesskey="u" rel="up">Installation and Customization</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-on-Unix-1"></a>
cannam@127 79 <h3 class="section">10.1 Installation on Unix</h3>
cannam@127 80
cannam@127 81 <p>FFTW comes with a <code>configure</code> program in the GNU style.
cannam@127 82 Installation can be as simple as:
cannam@127 83 <a name="index-configure-2"></a>
cannam@127 84 </p>
cannam@127 85 <div class="example">
cannam@127 86 <pre class="example">./configure
cannam@127 87 make
cannam@127 88 make install
cannam@127 89 </pre></div>
cannam@127 90
cannam@127 91 <p>This will build the uniprocessor complex and real transform libraries
cannam@127 92 along with the test programs. (We recommend that you use GNU
cannam@127 93 <code>make</code> if it is available; on some systems it is called
cannam@127 94 <code>gmake</code>.) The &ldquo;<code>make install</code>&rdquo; command installs the fftw
cannam@127 95 and rfftw libraries in standard places, and typically requires root
cannam@127 96 privileges (unless you specify a different install directory with the
cannam@127 97 <code>--prefix</code> flag to <code>configure</code>). You can also type
cannam@127 98 &ldquo;<code>make check</code>&rdquo; to put the FFTW test programs through their paces.
cannam@127 99 If you have problems during configuration or compilation, you may want
cannam@127 100 to run &ldquo;<code>make distclean</code>&rdquo; before trying again; this ensures that
cannam@127 101 you don&rsquo;t have any stale files left over from previous compilation
cannam@127 102 attempts.
cannam@127 103 </p>
cannam@127 104 <p>The <code>configure</code> script chooses the <code>gcc</code> compiler by default,
cannam@127 105 if it is available; you can select some other compiler with:
cannam@127 106 </p><div class="example">
cannam@127 107 <pre class="example">./configure CC=&quot;<span class="roman"><i>&lt;the name of your C compiler&gt;</i></span>&quot;
cannam@127 108 </pre></div>
cannam@127 109
cannam@127 110 <p>The <code>configure</code> script knows good <code>CFLAGS</code> (C compiler flags)
cannam@127 111 <a name="index-compiler-flags"></a>
cannam@127 112 for a few systems. If your system is not known, the <code>configure</code>
cannam@127 113 script will print out a warning. In this case, you should re-configure
cannam@127 114 FFTW with the command
cannam@127 115 </p><div class="example">
cannam@127 116 <pre class="example">./configure CFLAGS=&quot;<span class="roman"><i>&lt;write your CFLAGS here&gt;</i></span>&quot;
cannam@127 117 </pre></div>
cannam@127 118 <p>and then compile as usual. If you do find an optimal set of
cannam@127 119 <code>CFLAGS</code> for your system, please let us know what they are (along
cannam@127 120 with the output of <code>config.guess</code>) so that we can include them in
cannam@127 121 future releases.
cannam@127 122 </p>
cannam@127 123 <p><code>configure</code> supports all the standard flags defined by the GNU
cannam@127 124 Coding Standards; see the <code>INSTALL</code> file in FFTW or
cannam@127 125 <a href="http://www.gnu.org/prep/standards/html_node/index.html">the GNU web page</a>.
cannam@127 126 Note especially <code>--help</code> to list all flags and
cannam@127 127 <code>--enable-shared</code> to create shared, rather than static, libraries.
cannam@127 128 <code>configure</code> also accepts a few FFTW-specific flags, particularly:
cannam@127 129 </p>
cannam@127 130 <ul>
cannam@127 131 <li> <a name="index-precision-9"></a>
cannam@127 132 <code>--enable-float</code>: Produces a single-precision version of FFTW
cannam@127 133 (<code>float</code>) instead of the default double-precision (<code>double</code>).
cannam@127 134 See <a href="Precision.html#Precision">Precision</a>.
cannam@127 135
cannam@127 136 </li><li> <a name="index-precision-10"></a>
cannam@127 137 <code>--enable-long-double</code>: Produces a long-double precision version of
cannam@127 138 FFTW (<code>long double</code>) instead of the default double-precision
cannam@127 139 (<code>double</code>). The <code>configure</code> script will halt with an error
cannam@127 140 message if <code>long double</code> is the same size as <code>double</code> on your
cannam@127 141 machine/compiler. See <a href="Precision.html#Precision">Precision</a>.
cannam@127 142
cannam@127 143 </li><li> <a name="index-precision-11"></a>
cannam@127 144 <code>--enable-quad-precision</code>: Produces a quadruple-precision version
cannam@127 145 of FFTW using the nonstandard <code>__float128</code> type provided by
cannam@127 146 <code>gcc</code> 4.6 or later on x86, x86-64, and Itanium architectures,
cannam@127 147 instead of the default double-precision (<code>double</code>). The
cannam@127 148 <code>configure</code> script will halt with an error message if the
cannam@127 149 compiler is not <code>gcc</code> version 4.6 or later or if <code>gcc</code>&rsquo;s
cannam@127 150 <code>libquadmath</code> library is not installed. See <a href="Precision.html#Precision">Precision</a>.
cannam@127 151
cannam@127 152 </li><li> <a name="index-threads-3"></a>
cannam@127 153 <code>--enable-threads</code>: Enables compilation and installation of the
cannam@127 154 FFTW threads library (see <a href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW">Multi-threaded FFTW</a>), which provides a
cannam@127 155 simple interface to parallel transforms for SMP systems. By default,
cannam@127 156 the threads routines are not compiled.
cannam@127 157
cannam@127 158 </li><li> <code>--enable-openmp</code>: Like <code>--enable-threads</code>, but using OpenMP
cannam@127 159 compiler directives in order to induce parallelism rather than
cannam@127 160 spawning its own threads directly, and installing an &lsquo;<samp>fftw3_omp</samp>&rsquo; library
cannam@127 161 rather than an &lsquo;<samp>fftw3_threads</samp>&rsquo; library (see <a href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW">Multi-threaded FFTW</a>). You can use both <code>--enable-openmp</code> and <code>--enable-threads</code>
cannam@127 162 since they compile/install libraries with different names. By default,
cannam@127 163 the OpenMP routines are not compiled.
cannam@127 164
cannam@127 165 </li><li> <code>--with-combined-threads</code>: By default, if <code>--enable-threads</code>
cannam@127 166 is used, the threads support is compiled into a separate library that
cannam@127 167 must be linked in addition to the main FFTW library. This is so that
cannam@127 168 users of the serial library do not need to link the system threads
cannam@127 169 libraries. If <code>--with-combined-threads</code> is specified, however,
cannam@127 170 then no separate threads library is created, and threads are included
cannam@127 171 in the main FFTW library. This is mainly useful under Windows, where
cannam@127 172 no system threads library is required and inter-library dependencies
cannam@127 173 are problematic.
cannam@127 174
cannam@127 175 </li><li> <a name="index-MPI-1"></a>
cannam@127 176 <code>--enable-mpi</code>: Enables compilation and installation of the FFTW
cannam@127 177 MPI library (see <a href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI">Distributed-memory FFTW with MPI</a>), which provides
cannam@127 178 parallel transforms for distributed-memory systems with MPI. (By
cannam@127 179 default, the MPI routines are not compiled.) See <a href="FFTW-MPI-Installation.html#FFTW-MPI-Installation">FFTW MPI Installation</a>.
cannam@127 180
cannam@127 181 </li><li> <a name="index-Fortran_002dcallable-wrappers"></a>
cannam@127 182 <code>--disable-fortran</code>: Disables inclusion of legacy-Fortran
cannam@127 183 wrapper routines (see <a href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran">Calling FFTW from Legacy Fortran</a>) in the standard
cannam@127 184 FFTW libraries. These wrapper routines increase the library size by
cannam@127 185 only a negligible amount, so they are included by default as long as
cannam@127 186 the <code>configure</code> script finds a Fortran compiler on your system.
cannam@127 187 (To specify a particular Fortran compiler <i>foo</i>, pass
cannam@127 188 <code>F77=</code><i>foo</i> to <code>configure</code>.)
cannam@127 189
cannam@127 190 </li><li> <code>--with-g77-wrappers</code>: By default, when Fortran wrappers are
cannam@127 191 included, the wrappers employ the linking conventions of the Fortran
cannam@127 192 compiler detected by the <code>configure</code> script. If this compiler is
cannam@127 193 GNU <code>g77</code>, however, then <em>two</em> versions of the wrappers are
cannam@127 194 included: one with <code>g77</code>&rsquo;s idiosyncratic convention of appending
cannam@127 195 two underscores to identifiers, and one with the more common
cannam@127 196 convention of appending only a single underscore. This way, the same
cannam@127 197 FFTW library will work with both <code>g77</code> and other Fortran
cannam@127 198 compilers, such as GNU <code>gfortran</code>. However, the converse is not
cannam@127 199 true: if you configure with a different compiler, then the
cannam@127 200 <code>g77</code>-compatible wrappers are not included. By specifying
cannam@127 201 <code>--with-g77-wrappers</code>, the <code>g77</code>-compatible wrappers are
cannam@127 202 included in addition to wrappers for whatever Fortran compiler
cannam@127 203 <code>configure</code> finds.
cannam@127 204 <a name="index-g77"></a>
cannam@127 205
cannam@127 206 </li><li> <code>--with-slow-timer</code>: Disables the use of hardware cycle counters,
cannam@127 207 and falls back on <code>gettimeofday</code> or <code>clock</code>. This greatly
cannam@127 208 worsens performance, and should generally not be used (unless you don&rsquo;t
cannam@127 209 have a cycle counter but still really want an optimized plan regardless
cannam@127 210 of the time). See <a href="Cycle-Counters.html#Cycle-Counters">Cycle Counters</a>.
cannam@127 211
cannam@127 212 </li><li> <code>--enable-sse</code> (single precision),
cannam@127 213 <code>--enable-sse2</code> (single, double),
cannam@127 214 <code>--enable-avx</code> (single, double),
cannam@127 215 <code>--enable-avx2</code> (single, double),
cannam@127 216 <code>--enable-avx512</code> (single, double),
cannam@127 217 <code>--enable-avx-128-fma</code>,
cannam@127 218 <code>--enable-kcvi</code> (single),
cannam@127 219 <code>--enable-altivec</code> (single),
cannam@127 220 <code>--enable-vsx</code> (single, double),
cannam@127 221 <code>--enable-neon</code> (single, double on aarch64),
cannam@127 222 <code>--enable-generic-simd128</code>,
cannam@127 223 and
cannam@127 224 <code>--enable-generic-simd256</code>:
cannam@127 225
cannam@127 226 <p>Enable various SIMD instruction sets. You need compiler that supports
cannam@127 227 the given SIMD extensions, but FFTW will try to detect at runtime
cannam@127 228 whether the CPU supports these extensions. That is, you can compile
cannam@127 229 with<code>--enable-avx</code> and the code will still run on a CPU without AVX
cannam@127 230 support.
cannam@127 231 </p>
cannam@127 232 <ul class="no-bullet">
cannam@127 233 <li>- These options require a compiler supporting SIMD extensions, and
cannam@127 234 compiler support is always a bit flaky: see the FFTW FAQ for a list of
cannam@127 235 compiler versions that have problems compiling FFTW.
cannam@127 236 </li><li>- Because of the large variety of ARM processors and ABIs, FFTW
cannam@127 237 does not attempt to guess the correct <code>gcc</code> flags for generating
cannam@127 238 NEON code. In general, you will have to provide them on the command line.
cannam@127 239 This command line is known to have worked at least once:
cannam@127 240 <div class="example">
cannam@127 241 <pre class="example">./configure --with-slow-timer --host=arm-linux-gnueabi \
cannam@127 242 --enable-single --enable-neon \
cannam@127 243 &quot;CC=arm-linux-gnueabi-gcc -march=armv7-a -mfloat-abi=softfp&quot;
cannam@127 244 </pre></div>
cannam@127 245 </li></ul>
cannam@127 246
cannam@127 247 </li></ul>
cannam@127 248
cannam@127 249 <a name="index-compiler-2"></a>
cannam@127 250 <p>To force <code>configure</code> to use a particular C compiler <i>foo</i>
cannam@127 251 (instead of the default, usually <code>gcc</code>), pass <code>CC=</code><i>foo</i> to the
cannam@127 252 <code>configure</code> script; you may also need to set the flags via the variable
cannam@127 253 <code>CFLAGS</code> as described above.
cannam@127 254 <a name="index-compiler-flags-1"></a>
cannam@127 255 </p>
cannam@127 256 <hr>
cannam@127 257 <div class="header">
cannam@127 258 <p>
cannam@127 259 Next: <a href="Installation-on-non_002dUnix-systems.html#Installation-on-non_002dUnix-systems" accesskey="n" rel="next">Installation on non-Unix systems</a>, Previous: <a href="Installation-and-Customization.html#Installation-and-Customization" accesskey="p" rel="prev">Installation and Customization</a>, Up: <a href="Installation-and-Customization.html#Installation-and-Customization" accesskey="u" rel="up">Installation and Customization</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>
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