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Add null config files
author Chris Cannam <cannam@all-day-breakfast.com>
date Mon, 02 Mar 2020 14:03:47 +0000
parents bd3cc4d1df30
children
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cannam@167 3 <!-- This manual is for FFTW
cannam@167 4 (version 3.3.8, 24 May 2018).
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cannam@167 6 Copyright (C) 2003 Matteo Frigo.
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cannam@167 24 <head>
cannam@167 25 <title>FFTW 3.3.8: MPI Wisdom Communication</title>
cannam@167 26
cannam@167 27 <meta name="description" content="FFTW 3.3.8: MPI Wisdom Communication">
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cannam@167 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
cannam@167 36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
cannam@167 37 <link href="FFTW-MPI-Fortran-Interface.html#FFTW-MPI-Fortran-Interface" rel="next" title="FFTW MPI Fortran Interface">
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cannam@167 68 </head>
cannam@167 69
cannam@167 70 <body lang="en">
cannam@167 71 <a name="MPI-Wisdom-Communication"></a>
cannam@167 72 <div class="header">
cannam@167 73 <p>
cannam@167 74 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>
cannam@167 75 </div>
cannam@167 76 <hr>
cannam@167 77 <a name="MPI-Wisdom-Communication-1"></a>
cannam@167 78 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
cannam@167 79
cannam@167 80 <p>To facilitate synchronizing wisdom among the different MPI processes,
cannam@167 81 we provide two functions:
cannam@167 82 </p>
cannam@167 83 <a name="index-fftw_005fmpi_005fgather_005fwisdom-1"></a>
cannam@167 84 <a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></a>
cannam@167 85 <div class="example">
cannam@167 86 <pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm);
cannam@167 87 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
cannam@167 88 </pre></div>
cannam@167 89
cannam@167 90 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
cannam@167 91 given communicator <code>comm</code> to the process of rank 0 in the
cannam@167 92 communicator: that process obtains the union of all wisdom on all the
cannam@167 93 processes. As a side effect, some other processes will gain
cannam@167 94 additional wisdom from other processes, but only process 0 will gain
cannam@167 95 the complete union.
cannam@167 96 </p>
cannam@167 97 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
cannam@167 98 wisdom from process 0 in <code>comm</code> to all other processes in the
cannam@167 99 communicator, replacing any wisdom they currently have.
cannam@167 100 </p>
cannam@167 101 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
cannam@167 102 </p>
cannam@167 103
cannam@167 104
cannam@167 105
cannam@167 106 </body>
cannam@167 107 </html>