Mercurial > hg > sv-dependency-builds

<html lang="en">
<head>
<title>MPI Wisdom Communication - FFTW 3.3.3</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="FFTW 3.3.3">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" title="FFTW MPI Reference">
<link rel="prev" href="MPI-Plan-Creation.html#MPI-Plan-Creation" title="MPI Plan Creation">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This manual is for FFTW
(version 3.3.3, 25 November 2012).

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.
   -->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
  pre.display { font-family:inherit }
  pre.format  { font-family:inherit }
  pre.smalldisplay { font-family:inherit; font-size:smaller }
  pre.smallformat  { font-family:inherit; font-size:smaller }
  pre.smallexample { font-size:smaller }
  pre.smalllisp    { font-size:smaller }
  span.sc    { font-variant:small-caps }
  span.roman { font-family:serif; font-weight:normal; }
  span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<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>
author	Chris Cannam
date	Wed, 20 Mar 2013 15:35:50 +0000
parents
children