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Add null config files
author Chris Cannam <cannam@all-day-breakfast.com>
date Mon, 02 Mar 2020 14:03:47 +0000
parents bd3cc4d1df30
children
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cannam@167 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
cannam@167 2 <html>
cannam@167 3 <!-- This manual is for FFTW
cannam@167 4 (version 3.3.8, 24 May 2018).
cannam@167 5
cannam@167 6 Copyright (C) 2003 Matteo Frigo.
cannam@167 7
cannam@167 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@167 10 Permission is granted to make and distribute verbatim copies of this
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cannam@167 23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
cannam@167 24 <head>
cannam@167 25 <title>FFTW 3.3.8: MPI Initialization</title>
cannam@167 26
cannam@167 27 <meta name="description" content="FFTW 3.3.8: MPI Initialization">
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cannam@167 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
cannam@167 36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
cannam@167 37 <link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
cannam@167 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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cannam@167 68 </head>
cannam@167 69
cannam@167 70 <body lang="en">
cannam@167 71 <a name="MPI-Initialization"></a>
cannam@167 72 <div class="header">
cannam@167 73 <p>
cannam@167 74 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>
cannam@167 75 </div>
cannam@167 76 <hr>
cannam@167 77 <a name="MPI-Initialization-1"></a>
cannam@167 78 <h4 class="subsection">6.12.2 MPI Initialization</h4>
cannam@167 79
cannam@167 80 <p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
cannam@167 81 before importing any wisdom for MPI problems, you must call:
cannam@167 82 </p>
cannam@167 83 <a name="index-fftw_005fmpi_005finit-4"></a>
cannam@167 84 <div class="example">
cannam@167 85 <pre class="example">void fftw_mpi_init(void);
cannam@167 86 </pre></div>
cannam@167 87
cannam@167 88 <a name="index-fftw_005finit_005fthreads-3"></a>
cannam@167 89 <p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
cannam@167 90 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
cannam@167 91 <code>fftw_mpi_cleanup</code>) has no effect.
cannam@167 92 </p>
cannam@167 93
cannam@167 94 <p>If you want to deallocate all persistent data and reset FFTW to the
cannam@167 95 pristine state it was in when you started your program, you can call:
cannam@167 96 </p>
cannam@167 97 <a name="index-fftw_005fmpi_005fcleanup-1"></a>
cannam@167 98 <div class="example">
cannam@167 99 <pre class="example">void fftw_mpi_cleanup(void);
cannam@167 100 </pre></div>
cannam@167 101
cannam@167 102 <a name="index-fftw_005fcleanup-1"></a>
cannam@167 103 <p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
cannam@167 104 cleanup routine too, although it is safe to do so.) After calling
cannam@167 105 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
cannam@167 106 should not attempt to execute or destroy them. You must call
cannam@167 107 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
cannam@167 108 to resume using the MPI FFTW routines.
cannam@167 109 </p>
cannam@167 110
cannam@167 111
cannam@167 112
cannam@167 113 </body>
cannam@167 114 </html>