96 lines
4.1 KiB
HTML
96 lines
4.1 KiB
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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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<title>MPI Files and Data Types (FFTW 3.3.10)</title>
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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="FFTW-MPI-Reference.html" rel="up" title="FFTW MPI Reference">
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<link href="MPI-Initialization.html" rel="next" title="MPI Initialization">
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<span id="MPI-Files-and-Data-Types"></span><div class="header">
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<p>
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Next: <a href="MPI-Initialization.html" accesskey="n" rel="next">MPI Initialization</a>, Previous: <a href="FFTW-MPI-Reference.html" accesskey="p" rel="prev">FFTW MPI Reference</a>, Up: <a href="FFTW-MPI-Reference.html" accesskey="u" rel="up">FFTW MPI Reference</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="MPI-Files-and-Data-Types-1"></span><h4 class="subsection">6.12.1 MPI Files and Data Types</h4>
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<p>All programs using FFTW’s MPI support should include its header file:
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</p>
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<div class="example">
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<pre class="example">#include <fftw3-mpi.h>
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</pre></div>
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<p>Note that this header file includes the serial-FFTW <code>fftw3.h</code>
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header file, and also the <code>mpi.h</code> header file for MPI, so you
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need not include those files separately.
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</p>
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<p>You must also link to <em>both</em> the FFTW MPI library and to the
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serial FFTW library. On Unix, this means adding <code>-lfftw3_mpi
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-lfftw3 -lm</code> at the end of the link command.
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</p>
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<span id="index-precision-6"></span>
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<p>Different precisions are handled as in the serial interface:
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See <a href="Precision.html">Precision</a>. That is, ‘<samp>fftw_</samp>’ functions become
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<code>fftwf_</code> (in single precision) etcetera, and the libraries become
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<code>-lfftw3f_mpi -lfftw3f -lm</code> etcetera on Unix. Long-double
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precision is supported in MPI, but quad precision (‘<samp>fftwq_</samp>’) is
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not due to the lack of MPI support for this type.
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</p>
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</html>
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