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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <!-- This manual is for FFTW
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4 (version 3.3.8, 24 May 2018).
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5
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6 Copyright (C) 2003 Matteo Frigo.
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7
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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9
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10 Permission is granted to make and distribute verbatim copies of this
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11 manual provided the copyright notice and this permission notice are
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12 preserved on all copies.
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13
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14 Permission is granted to copy and distribute modified versions of this
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15 manual under the conditions for verbatim copying, provided that the
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17 permission notice identical to this one.
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23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
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24 <head>
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25 <title>FFTW 3.3.8: MPI Wisdom Communication</title>
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26
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27 <meta name="description" content="FFTW 3.3.8: MPI Wisdom Communication">
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28 <meta name="keywords" content="FFTW 3.3.8: MPI Wisdom Communication">
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33 <link href="index.html#Top" rel="start" title="Top">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
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37 <link href="FFTW-MPI-Fortran-Interface.html#FFTW-MPI-Fortran-Interface" rel="next" title="FFTW MPI Fortran Interface">
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65 </style>
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66
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68 </head>
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69
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70 <body lang="en">
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71 <a name="MPI-Wisdom-Communication"></a>
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72 <div class="header">
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73 <p>
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74 Previous: <a href="MPI-Plan-Creation.html#MPI-Plan-Creation" accesskey="p" rel="prev">MPI Plan Creation</a>, Up: <a href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" accesskey="u" rel="up">FFTW MPI Reference</a> [<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>
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75 </div>
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76 <hr>
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77 <a name="MPI-Wisdom-Communication-1"></a>
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78 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
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79
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80 <p>To facilitate synchronizing wisdom among the different MPI processes,
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81 we provide two functions:
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82 </p>
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83 <a name="index-fftw_005fmpi_005fgather_005fwisdom-1"></a>
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84 <a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></a>
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85 <div class="example">
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86 <pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
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87 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
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88 </pre></div>
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89
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90 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
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91 given communicator <code>comm</code> to the process of rank 0 in the
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92 communicator: that process obtains the union of all wisdom on all the
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93 processes. As a side effect, some other processes will gain
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94 additional wisdom from other processes, but only process 0 will gain
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95 the complete union.
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96 </p>
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97 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
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98 wisdom from process 0 in <code>comm</code> to all other processes in the
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99 communicator, replacing any wisdom they currently have.
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100 </p>
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101 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
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102 </p>
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103
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104
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105
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106 </body>
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107 </html>
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