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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<html lang="en">
+<head>
+<title>MPI Wisdom Communication - FFTW 3.3.3</title>
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+<link rel="up" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" title="FFTW MPI Reference">
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+<!--
+This manual is for FFTW
+(version 3.3.3, 25 November 2012).
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+Copyright (C) 2003 Matteo Frigo.
+
+Copyright (C) 2003 Massachusetts Institute of Technology.
+
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+     notice are preserved on all copies.
+
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+</head>
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+<div class="node">
+<a name="MPI-Wisdom-Communication"></a>
+<p>
+Previous:&nbsp;<a rel="previous" accesskey="p" href="MPI-Plan-Creation.html#MPI-Plan-Creation">MPI Plan Creation</a>,
+Up:&nbsp;<a rel="up" accesskey="u" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>
+<hr>
+</div>
+
+<h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
+
+<p>To facilitate synchronizing wisdom among the different MPI processes,
+we provide two functions:
+
+   <p><a name="index-fftw_005fmpi_005fgather_005fwisdom-492"></a><a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-493"></a>
+<pre class="example">     void fftw_mpi_gather_wisdom(MPI_Comm comm);
+     void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
+</pre>
+   <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
+given communicator <code>comm</code> to the process of rank 0 in the
+communicator: that process obtains the union of all wisdom on all the
+processes.  As a side effect, some other processes will gain
+additional wisdom from other processes, but only process 0 will gain
+the complete union.
+
+   <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
+wisdom from process 0 in <code>comm</code> to all other processes in the
+communicator, replacing any wisdom they currently have.
+
+   <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
+
+<!--  -->
+   </body></html>
+