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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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3 <!-- This manual is for FFTW
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6 Copyright (C) 2003 Matteo Frigo.
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25 <title>FFTW 3.3.8: MPI Wisdom Communication</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="FFTW-MPI-Fortran-Interface.html#FFTW-MPI-Fortran-Interface" rel="next" title="FFTW MPI Fortran Interface">
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71 <a name="MPI-Wisdom-Communication"></a>
72 <div class="header">
73 <p>
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> &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>
75 </div>
76 <hr>
77 <a name="MPI-Wisdom-Communication-1"></a>
78 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
79
80 <p>To facilitate synchronizing wisdom among the different MPI processes,
81 we provide two functions:
82 </p>
83 <a name="index-fftw_005fmpi_005fgather_005fwisdom-1"></a>
84 <a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></a>
85 <div class="example">
86 <pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
87 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
88 </pre></div>
89
90 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
91 given communicator <code>comm</code> to the process of rank 0 in the
92 communicator: that process obtains the union of all wisdom on all the
93 processes. As a side effect, some other processes will gain
94 additional wisdom from other processes, but only process 0 will gain
95 the complete union.
96 </p>
97 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
98 wisdom from process 0 in <code>comm</code> to all other processes in the
99 communicator, replacing any wisdom they currently have.
100 </p>
101 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
102 </p>
103
104
105
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