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comparison src/fftw-3.3.8/doc/html/MPI-Wisdom-Communication.html @ 167:bd3cc4d1df30
Add FFTW 3.3.8 source, and a Linux build
author | Chris Cannam <cannam@all-day-breakfast.com> |
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date | Tue, 19 Nov 2019 14:52:55 +0000 |
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166:cbd6d7e562c7 | 167:bd3cc4d1df30 |
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> | |
2 <html> | |
3 <!-- This manual is for FFTW | |
4 (version 3.3.8, 24 May 2018). | |
5 | |
6 Copyright (C) 2003 Matteo Frigo. | |
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8 Copyright (C) 2003 Massachusetts Institute of Technology. | |
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24 <head> | |
25 <title>FFTW 3.3.8: MPI Wisdom Communication</title> | |
26 | |
27 <meta name="description" content="FFTW 3.3.8: MPI Wisdom Communication"> | |
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> | |
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> | |
36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference"> | |
37 <link href="FFTW-MPI-Fortran-Interface.html#FFTW-MPI-Fortran-Interface" rel="next" title="FFTW MPI Fortran Interface"> | |
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66 | |
67 | |
68 </head> | |
69 | |
70 <body lang="en"> | |
71 <a name="MPI-Wisdom-Communication"></a> | |
72 <div class="header"> | |
73 <p> | |
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> [<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> | |
75 </div> | |
76 <hr> | |
77 <a name="MPI-Wisdom-Communication-1"></a> | |
78 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4> | |
79 | |
80 <p>To facilitate synchronizing wisdom among the different MPI processes, | |
81 we provide two functions: | |
82 </p> | |
83 <a name="index-fftw_005fmpi_005fgather_005fwisdom-1"></a> | |
84 <a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-1"></a> | |
85 <div class="example"> | |
86 <pre class="example">void fftw_mpi_gather_wisdom(MPI_Comm comm); | |
87 void fftw_mpi_broadcast_wisdom(MPI_Comm comm); | |
88 </pre></div> | |
89 | |
90 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the | |
91 given communicator <code>comm</code> to the process of rank 0 in the | |
92 communicator: that process obtains the union of all wisdom on all the | |
93 processes. As a side effect, some other processes will gain | |
94 additional wisdom from other processes, but only process 0 will gain | |
95 the complete union. | |
96 </p> | |
97 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports | |
98 wisdom from process 0 in <code>comm</code> to all other processes in the | |
99 communicator, replacing any wisdom they currently have. | |
100 </p> | |
101 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>. | |
102 </p> | |
103 | |
104 | |
105 | |
106 </body> | |
107 </html> |