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108 lines
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108 lines
4.6 KiB
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<html>
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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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approved by the Free Software Foundation. -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Linking and Initializing MPI FFTW (FFTW 3.3.10)</title>
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<meta name="description" content="Linking and Initializing MPI FFTW (FFTW 3.3.10)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Distributed_002dmemory-FFTW-with-MPI.html" rel="up" title="Distributed-memory FFTW with MPI">
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<link href="2d-MPI-example.html" rel="next" title="2d MPI example">
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<link href="FFTW-MPI-Installation.html" rel="prev" title="FFTW MPI Installation">
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</head>
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<body lang="en">
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<span id="Linking-and-Initializing-MPI-FFTW"></span><div class="header">
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<p>
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Next: <a href="2d-MPI-example.html" accesskey="n" rel="next">2d MPI example</a>, Previous: <a href="FFTW-MPI-Installation.html" accesskey="p" rel="prev">FFTW MPI Installation</a>, Up: <a href="Distributed_002dmemory-FFTW-with-MPI.html" accesskey="u" rel="up">Distributed-memory FFTW with MPI</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Linking-and-Initializing-MPI-FFTW-1"></span><h3 class="section">6.2 Linking and Initializing MPI FFTW</h3>
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<p>Programs using the MPI FFTW routines should be linked with
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<code>-lfftw3_mpi -lfftw3 -lm</code> on Unix in double precision,
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<code>-lfftw3f_mpi -lfftw3f -lm</code> in single precision, and so on
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(see <a href="Precision.html">Precision</a>). You will also need to link with whatever library
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is responsible for MPI on your system; in most MPI implementations,
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there is a special compiler alias named <code>mpicc</code> to compile and
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link MPI code.
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<span id="index-mpicc-1"></span>
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<span id="index-linking-on-Unix-1"></span>
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<span id="index-precision-5"></span>
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</p>
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<span id="index-fftw_005finit_005fthreads-1"></span>
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<p>Before calling any FFTW routines except possibly
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<code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html">Combining MPI and Threads</a>), but after calling
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<code>MPI_Init</code>, you should call the function:
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</p>
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<div class="example">
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<pre class="example">void fftw_mpi_init(void);
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</pre></div>
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<span id="index-fftw_005fmpi_005finit"></span>
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<p>If, at the end of your program, you want to get rid of all memory and
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other resources allocated internally by FFTW, for both the serial and
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MPI routines, you can call:
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</p>
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<div class="example">
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<pre class="example">void fftw_mpi_cleanup(void);
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</pre></div>
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<span id="index-fftw_005fmpi_005fcleanup"></span>
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<p>which is much like the <code>fftw_cleanup()</code> function except that it
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also gets rid of FFTW’s MPI-related data. You must <em>not</em> execute
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any previously created plans after calling this function.
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</p>
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</body>
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</html>
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