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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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cannam@127 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
cannam@127 2 <html>
cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: MPI Initialization</title>
cannam@127 26
cannam@127 27 <meta name="description" content="FFTW 3.3.5: MPI Initialization">
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cannam@127 36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
cannam@127 37 <link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
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cannam@127 69 </head>
cannam@127 70
cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="MPI-Initialization"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 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>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="MPI-Initialization-1"></a>
cannam@127 79 <h4 class="subsection">6.12.2 MPI Initialization</h4>
cannam@127 80
cannam@127 81 <p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
cannam@127 82 before importing any wisdom for MPI problems, you must call:
cannam@127 83 </p>
cannam@127 84 <a name="index-fftw_005fmpi_005finit-4"></a>
cannam@127 85 <div class="example">
cannam@127 86 <pre class="example">void fftw_mpi_init(void);
cannam@127 87 </pre></div>
cannam@127 88
cannam@127 89 <a name="index-fftw_005finit_005fthreads-3"></a>
cannam@127 90 <p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
cannam@127 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
cannam@127 92 <code>fftw_mpi_cleanup</code>) has no effect.
cannam@127 93 </p>
cannam@127 94
cannam@127 95 <p>If you want to deallocate all persistent data and reset FFTW to the
cannam@127 96 pristine state it was in when you started your program, you can call:
cannam@127 97 </p>
cannam@127 98 <a name="index-fftw_005fmpi_005fcleanup-1"></a>
cannam@127 99 <div class="example">
cannam@127 100 <pre class="example">void fftw_mpi_cleanup(void);
cannam@127 101 </pre></div>
cannam@127 102
cannam@127 103 <a name="index-fftw_005fcleanup-1"></a>
cannam@127 104 <p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
cannam@127 105 cleanup routine too, although it is safe to do so.) After calling
cannam@127 106 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
cannam@127 107 should not attempt to execute or destroy them. You must call
cannam@127 108 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
cannam@127 109 to resume using the MPI FFTW routines.
cannam@127 110 </p>
cannam@127 111
cannam@127 112
cannam@127 113
cannam@127 114 </body>
cannam@127 115 </html>