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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 2cd0e3b3e1fd
children
rev   line source
Chris@42 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Chris@42 2 <html>
Chris@42 3 <!-- This manual is for FFTW
Chris@42 4 (version 3.3.5, 30 July 2016).
Chris@42 5
Chris@42 6 Copyright (C) 2003 Matteo Frigo.
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Chris@42 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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Chris@42 22 approved by the Free Software Foundation. -->
Chris@42 23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
Chris@42 24 <head>
Chris@42 25 <title>FFTW 3.3.5: MPI Initialization</title>
Chris@42 26
Chris@42 27 <meta name="description" content="FFTW 3.3.5: MPI Initialization">
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Chris@42 33 <link href="index.html#Top" rel="start" title="Top">
Chris@42 34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
Chris@42 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
Chris@42 36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
Chris@42 37 <link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
Chris@42 38 <link href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" rel="prev" title="MPI Files and Data Types">
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Chris@42 67
Chris@42 68
Chris@42 69 </head>
Chris@42 70
Chris@42 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
Chris@42 72 <a name="MPI-Initialization"></a>
Chris@42 73 <div class="header">
Chris@42 74 <p>
Chris@42 75 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>
Chris@42 76 </div>
Chris@42 77 <hr>
Chris@42 78 <a name="MPI-Initialization-1"></a>
Chris@42 79 <h4 class="subsection">6.12.2 MPI Initialization</h4>
Chris@42 80
Chris@42 81 <p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
Chris@42 82 before importing any wisdom for MPI problems, you must call:
Chris@42 83 </p>
Chris@42 84 <a name="index-fftw_005fmpi_005finit-4"></a>
Chris@42 85 <div class="example">
Chris@42 86 <pre class="example">void fftw_mpi_init(void);
Chris@42 87 </pre></div>
Chris@42 88
Chris@42 89 <a name="index-fftw_005finit_005fthreads-3"></a>
Chris@42 90 <p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
Chris@42 91 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
Chris@42 92 <code>fftw_mpi_cleanup</code>) has no effect.
Chris@42 93 </p>
Chris@42 94
Chris@42 95 <p>If you want to deallocate all persistent data and reset FFTW to the
Chris@42 96 pristine state it was in when you started your program, you can call:
Chris@42 97 </p>
Chris@42 98 <a name="index-fftw_005fmpi_005fcleanup-1"></a>
Chris@42 99 <div class="example">
Chris@42 100 <pre class="example">void fftw_mpi_cleanup(void);
Chris@42 101 </pre></div>
Chris@42 102
Chris@42 103 <a name="index-fftw_005fcleanup-1"></a>
Chris@42 104 <p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
Chris@42 105 cleanup routine too, although it is safe to do so.) After calling
Chris@42 106 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
Chris@42 107 should not attempt to execute or destroy them. You must call
Chris@42 108 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
Chris@42 109 to resume using the MPI FFTW routines.
Chris@42 110 </p>
Chris@42 111
Chris@42 112
Chris@42 113
Chris@42 114 </body>
Chris@42 115 </html>