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1 <html lang="en">
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2 <head>
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3 <title>MPI Initialization - FFTW 3.3.4</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.4">
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6 <meta name="generator" content="makeinfo 4.13">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" title="FFTW MPI Reference">
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9 <link rel="prev" href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" title="MPI Files and Data Types">
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10 <link rel="next" href="Using-MPI-Plans.html#Using-MPI-Plans" title="Using MPI Plans">
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11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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12 <!--
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13 This manual is for FFTW
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14 (version 3.3.4, 20 September 2013).
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15
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16 Copyright (C) 2003 Matteo Frigo.
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17
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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19
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20 Permission is granted to make and distribute verbatim copies of
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21 this manual provided the copyright notice and this permission
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22 notice are preserved on all copies.
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23
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24 Permission is granted to copy and distribute modified versions of
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25 this manual under the conditions for verbatim copying, provided
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26 that the entire resulting derived work is distributed under the
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27 terms of a permission notice identical to this one.
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28
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29 Permission is granted to copy and distribute translations of this
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30 manual into another language, under the above conditions for
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31 modified versions, except that this permission notice may be
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32 stated in a translation approved by the Free Software Foundation.
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33 -->
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35 <style type="text/css"><!--
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45 --></style>
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46 </head>
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47 <body>
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48 <div class="node">
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49 <a name="MPI-Initialization"></a>
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50 <p>
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51 Next: <a rel="next" accesskey="n" href="Using-MPI-Plans.html#Using-MPI-Plans">Using MPI Plans</a>,
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52 Previous: <a rel="previous" accesskey="p" href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types">MPI Files and Data Types</a>,
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53 Up: <a rel="up" accesskey="u" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>
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54 <hr>
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55 </div>
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56
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57 <h4 class="subsection">6.12.2 MPI Initialization</h4>
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58
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59 <p>Before calling any other FFTW MPI (‘<samp><span class="samp">fftw_mpi_</span></samp>’) function, and
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60 before importing any wisdom for MPI problems, you must call:
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61
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62 <p><a name="index-fftw_005fmpi_005finit-437"></a>
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63 <pre class="example"> void fftw_mpi_init(void);
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64 </pre>
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65 <p><a name="index-fftw_005finit_005fthreads-438"></a>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
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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
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67 <code>fftw_mpi_cleanup</code>) has no effect.
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68
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69 <p>If you want to deallocate all persistent data and reset FFTW to the
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70 pristine state it was in when you started your program, you can call:
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71
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72 <p><a name="index-fftw_005fmpi_005fcleanup-439"></a>
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73 <pre class="example"> void fftw_mpi_cleanup(void);
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74 </pre>
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75 <p><a name="index-fftw_005fcleanup-440"></a>(This calls <code>fftw_cleanup</code>, so you need not call the serial
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76 cleanup routine too, although it is safe to do so.) After calling
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77 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
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78 should not attempt to execute or destroy them. You must call
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79 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
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80 to resume using the MPI FFTW routines.
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81
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82 </body></html>
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83
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