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2 <head>
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3 <title>MPI Wisdom Communication - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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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-Plan-Creation.html#MPI-Plan-Creation" title="MPI Plan Creation">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.3, 25 November 2012).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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34 <style type="text/css"><!--
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="MPI-Wisdom-Communication"></a>
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49 <p>
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50 Previous: <a rel="previous" accesskey="p" href="MPI-Plan-Creation.html#MPI-Plan-Creation">MPI Plan Creation</a>,
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51 Up: <a rel="up" accesskey="u" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>
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52 <hr>
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53 </div>
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54
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55 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
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56
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57 <p>To facilitate synchronizing wisdom among the different MPI processes,
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58 we provide two functions:
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59
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60 <p><a name="index-fftw_005fmpi_005fgather_005fwisdom-492"></a><a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-493"></a>
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61 <pre class="example"> void fftw_mpi_gather_wisdom(MPI_Comm comm);
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62 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
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63 </pre>
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64 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
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65 given communicator <code>comm</code> to the process of rank 0 in the
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66 communicator: that process obtains the union of all wisdom on all the
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67 processes. As a side effect, some other processes will gain
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68 additional wisdom from other processes, but only process 0 will gain
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69 the complete union.
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70
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71 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
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72 wisdom from process 0 in <code>comm</code> to all other processes in the
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73 communicator, replacing any wisdom they currently have.
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74
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75 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
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76
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77 <!-- -->
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78 </body></html>
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79
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