97 lines
3.9 KiB
HTML
97 lines
3.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>MPI Wisdom Communication (FFTW 3.3.10)</title>
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<meta name="description" content="MPI Wisdom Communication (FFTW 3.3.10)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="FFTW-MPI-Reference.html" rel="up" title="FFTW MPI Reference">
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<link href="FFTW-MPI-Fortran-Interface.html" rel="next" title="FFTW MPI Fortran Interface">
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<link href="MPI-Plan-Creation.html" rel="prev" title="MPI Plan Creation">
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</head>
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<body lang="en">
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<span id="MPI-Wisdom-Communication"></span><div class="header">
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<p>
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Previous: <a href="MPI-Plan-Creation.html" accesskey="p" rel="prev">MPI Plan Creation</a>, Up: <a href="FFTW-MPI-Reference.html" 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" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="MPI-Wisdom-Communication-1"></span><h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
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<p>To facilitate synchronizing wisdom among the different MPI processes,
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we provide two functions:
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</p>
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<span id="index-fftw_005fmpi_005fgather_005fwisdom-1"></span>
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<span id="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></span>
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<div class="example">
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<pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
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void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
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</pre></div>
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<p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
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given communicator <code>comm</code> to the process of rank 0 in the
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communicator: that process obtains the union of all wisdom on all the
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processes. As a side effect, some other processes will gain
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additional wisdom from other processes, but only process 0 will gain
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the complete union.
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</p>
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<p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
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wisdom from process 0 in <code>comm</code> to all other processes in the
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communicator, replacing any wisdom they currently have.
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</p>
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<p>See <a href="FFTW-MPI-Wisdom.html">FFTW MPI Wisdom</a>.
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</p>
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</body>
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</html>
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