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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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3 <!-- This manual is for FFTW
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6 Copyright (C) 2003 Matteo Frigo.
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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25 <title>FFTW 3.3.5: MPI Initialization</title>
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
37 <link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
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72 <a name="MPI-Initialization"></a>
73 <div class="header">
74 <p>
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>
76 </div>
77 <hr>
78 <a name="MPI-Initialization-1"></a>
79 <h4 class="subsection">6.12.2 MPI Initialization</h4>
80
81 <p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
82 before importing any wisdom for MPI problems, you must call:
83 </p>
84 <a name="index-fftw_005fmpi_005finit-4"></a>
85 <div class="example">
86 <pre class="example">void fftw_mpi_init(void);
87 </pre></div>
88
89 <a name="index-fftw_005finit_005fthreads-3"></a>
90 <p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
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
92 <code>fftw_mpi_cleanup</code>) has no effect.
93 </p>
94
95 <p>If you want to deallocate all persistent data and reset FFTW to the
96 pristine state it was in when you started your program, you can call:
97 </p>
98 <a name="index-fftw_005fmpi_005fcleanup-1"></a>
99 <div class="example">
100 <pre class="example">void fftw_mpi_cleanup(void);
101 </pre></div>
102
103 <a name="index-fftw_005fcleanup-1"></a>
104 <p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
105 cleanup routine too, although it is safe to do so.) After calling
106 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
107 should not attempt to execute or destroy them. You must call
108 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
109 to resume using the MPI FFTW routines.
110 </p>
111
112
113
114 </body>
115 </html>