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author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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25 <title>FFTW 3.3.5: MPI Wisdom Communication</title>
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72 <a name="MPI-Wisdom-Communication"></a>
73 <div class="header">
74 <p>
75 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>
76 </div>
77 <hr>
78 <a name="MPI-Wisdom-Communication-1"></a>
79 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
80
81 <p>To facilitate synchronizing wisdom among the different MPI processes,
82 we provide two functions:
83 </p>
84 <a name="index-fftw_005fmpi_005fgather_005fwisdom-1"></a>
85 <a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></a>
86 <div class="example">
87 <pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
88 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
89 </pre></div>
90
91 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
92 given communicator <code>comm</code> to the process of rank 0 in the
93 communicator: that process obtains the union of all wisdom on all the
94 processes. As a side effect, some other processes will gain
95 additional wisdom from other processes, but only process 0 will gain
96 the complete union.
97 </p>
98 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
99 wisdom from process 0 in <code>comm</code> to all other processes in the
100 communicator, replacing any wisdom they currently have.
101 </p>
102 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
103 </p>
104
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