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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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1 <html lang="en">
2 <head>
3 <title>MPI Initialization - FFTW 3.3.3</title>
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12 <!--
13 This manual is for FFTW
14 (version 3.3.3, 25 November 2012).
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16 Copyright (C) 2003 Matteo Frigo.
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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49 <a name="MPI-Initialization"></a>
50 <p>
51 Next:&nbsp;<a rel="next" accesskey="n" href="Using-MPI-Plans.html#Using-MPI-Plans">Using MPI Plans</a>,
52 Previous:&nbsp;<a rel="previous" accesskey="p" href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types">MPI Files and Data Types</a>,
53 Up:&nbsp;<a rel="up" accesskey="u" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>
54 <hr>
55 </div>
56
57 <h4 class="subsection">6.12.2 MPI Initialization</h4>
58
59 <p>Before calling any other FFTW MPI (&lsquo;<samp><span class="samp">fftw_mpi_</span></samp>&rsquo;) function, and
60 before importing any wisdom for MPI problems, you must call:
61
62 <p><a name="index-fftw_005fmpi_005finit-434"></a>
63 <pre class="example"> void fftw_mpi_init(void);
64 </pre>
65 <p><a name="index-fftw_005finit_005fthreads-435"></a>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
66 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
67 <code>fftw_mpi_cleanup</code>) has no effect.
68
69 <p>If you want to deallocate all persistent data and reset FFTW to the
70 pristine state it was in when you started your program, you can call:
71
72 <p><a name="index-fftw_005fmpi_005fcleanup-436"></a>
73 <pre class="example"> void fftw_mpi_cleanup(void);
74 </pre>
75 <p><a name="index-fftw_005fcleanup-437"></a>(This calls <code>fftw_cleanup</code>, so you need not call the serial
76 cleanup routine too, although it is safe to do so.) After calling
77 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
78 should not attempt to execute or destroy them. You must call
79 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
80 to resume using the MPI FFTW routines.
81
82 </body></html>
83