97 lines
3.9 KiB
HTML
97 lines
3.9 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This manual is for FFTW
|
|
(version 3.3.10, 10 December 2020).
|
|
|
|
Copyright (C) 2003 Matteo Frigo.
|
|
|
|
Copyright (C) 2003 Massachusetts Institute of Technology.
|
|
|
|
Permission is granted to make and distribute verbatim copies of this
|
|
manual provided the copyright notice and this permission notice are
|
|
preserved on all copies.
|
|
|
|
Permission is granted to copy and distribute modified versions of this
|
|
manual under the conditions for verbatim copying, provided that the
|
|
entire resulting derived work is distributed under the terms of a
|
|
permission notice identical to this one.
|
|
|
|
Permission is granted to copy and distribute translations of this manual
|
|
into another language, under the above conditions for modified versions,
|
|
except that this permission notice may be stated in a translation
|
|
approved by the Free Software Foundation. -->
|
|
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>MPI Wisdom Communication (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="MPI Wisdom Communication (FFTW 3.3.10)">
|
|
<meta name="keywords" content="MPI Wisdom Communication (FFTW 3.3.10)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="FFTW-MPI-Reference.html" rel="up" title="FFTW MPI Reference">
|
|
<link href="FFTW-MPI-Fortran-Interface.html" rel="next" title="FFTW MPI Fortran Interface">
|
|
<link href="MPI-Plan-Creation.html" rel="prev" title="MPI Plan Creation">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<span id="MPI-Wisdom-Communication"></span><div class="header">
|
|
<p>
|
|
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>
|
|
</div>
|
|
<hr>
|
|
<span id="MPI-Wisdom-Communication-1"></span><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>
|
|
<span id="index-fftw_005fmpi_005fgather_005fwisdom-1"></span>
|
|
<span id="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></span>
|
|
<div class="example">
|
|
<pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
|
|
void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
|
|
</pre></div>
|
|
|
|
<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>
|
|
<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>
|
|
<p>See <a href="FFTW-MPI-Wisdom.html">FFTW MPI Wisdom</a>.
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|