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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam
date Tue, 19 Nov 2019 14:52:55 +0000
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<!-- This manual is for FFTW
+(version 3.3.8, 24 May 2018).
+
+Copyright (C) 2003 Matteo Frigo.
+
+Copyright (C) 2003 Massachusetts Institute of Technology.
+
+Permission is granted to make and distribute verbatim copies of this
+manual provided the copyright notice and this permission notice are
+preserved on all copies.
+
+Permission is granted to copy and distribute modified versions of this
+manual under the conditions for verbatim copying, provided that the
+entire resulting derived work is distributed under the terms of a
+permission notice identical to this one.
+
+Permission is granted to copy and distribute translations of this manual
+into another language, under the above conditions for modified versions,
+except that this permission notice may be stated in a translation
+approved by the Free Software Foundation. -->
+<!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
+<head>
+<title>FFTW 3.3.8: MPI Initialization</title>
+
+<meta name="description" content="FFTW 3.3.8: MPI Initialization">
+<meta name="keywords" content="FFTW 3.3.8: MPI Initialization">
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+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<link href="index.html#Top" rel="start" title="Top">
+<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
+<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
+<link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
+<link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
+<link href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" rel="prev" title="MPI Files and Data Types">
+<style type="text/css">
+<!--
+a.summary-letter {text-decoration: none}
+blockquote.indentedblock {margin-right: 0em}
+blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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+-->
+</style>
+
+
+</head>
+
+<body lang="en">
+<a name="MPI-Initialization"></a>
+<div class="header">
+<p>
+Next: <a href="Using-MPI-Plans.html#Using-MPI-Plans" accesskey="n" rel="next">Using MPI Plans</a>, Previous: <a href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" accesskey="p" rel="prev">MPI Files and Data Types</a>, Up: <a href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" accesskey="u" rel="up">FFTW MPI Reference</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>
+</div>
+<hr>
+<a name="MPI-Initialization-1"></a>
+<h4 class="subsection">6.12.2 MPI Initialization</h4>
+
+<p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
+before importing any wisdom for MPI problems, you must call:
+</p>
+<a name="index-fftw_005fmpi_005finit-4"></a>
+<div class="example">
+<pre class="example">void fftw_mpi_init(void);
+</pre></div>
+
+<a name="index-fftw_005finit_005fthreads-3"></a>
+<p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
+be called <em>after</em> <code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html#Combining-MPI-and-Threads">Combining MPI and Threads</a>).  Calling <code>fftw_mpi_init</code> additional times (before
+<code>fftw_mpi_cleanup</code>) has no effect.
+</p>
+
+<p>If you want to deallocate all persistent data and reset FFTW to the
+pristine state it was in when you started your program, you can call:
+</p>
+<a name="index-fftw_005fmpi_005fcleanup-1"></a>
+<div class="example">
+<pre class="example">void fftw_mpi_cleanup(void);
+</pre></div>
+
+<a name="index-fftw_005fcleanup-1"></a>
+<p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
+cleanup routine too, although it is safe to do so.)  After calling
+<code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
+should not attempt to execute or destroy them.  You must call
+<code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
+to resume using the MPI FFTW routines.
+</p>
+
+
+
+</body>
+</html>