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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <!-- This manual is for FFTW
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4 (version 3.3.8, 24 May 2018).
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5
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6 Copyright (C) 2003 Matteo Frigo.
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7
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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9
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10 Permission is granted to make and distribute verbatim copies of this
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11 manual provided the copyright notice and this permission notice are
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12 preserved on all copies.
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13
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14 Permission is granted to copy and distribute modified versions of this
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15 manual under the conditions for verbatim copying, provided that the
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16 entire resulting derived work is distributed under the terms of a
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17 permission notice identical to this one.
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18
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19 Permission is granted to copy and distribute translations of this manual
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20 into another language, under the above conditions for modified versions,
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22 approved by the Free Software Foundation. -->
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23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
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24 <head>
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25 <title>FFTW 3.3.8: MPI Initialization</title>
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26
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27 <meta name="description" content="FFTW 3.3.8: MPI Initialization">
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28 <meta name="keywords" content="FFTW 3.3.8: MPI Initialization">
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33 <link href="index.html#Top" rel="start" title="Top">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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36 <link href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" rel="up" title="FFTW MPI Reference">
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37 <link href="Using-MPI-Plans.html#Using-MPI-Plans" rel="next" title="Using MPI Plans">
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38 <link href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" rel="prev" title="MPI Files and Data Types">
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64 -->
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65 </style>
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66
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67
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68 </head>
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69
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70 <body lang="en">
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71 <a name="MPI-Initialization"></a>
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72 <div class="header">
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73 <p>
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74 Next: <a href="Using-MPI-Plans.html#Using-MPI-Plans" accesskey="n" rel="next">Using MPI Plans</a>, Previous: <a href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" accesskey="p" rel="prev">MPI Files and Data Types</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>
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75 </div>
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76 <hr>
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77 <a name="MPI-Initialization-1"></a>
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78 <h4 class="subsection">6.12.2 MPI Initialization</h4>
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79
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80 <p>Before calling any other FFTW MPI (‘<samp>fftw_mpi_</samp>’) function, and
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81 before importing any wisdom for MPI problems, you must call:
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82 </p>
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83 <a name="index-fftw_005fmpi_005finit-4"></a>
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84 <div class="example">
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85 <pre class="example">void fftw_mpi_init(void);
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86 </pre></div>
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87
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88 <a name="index-fftw_005finit_005fthreads-3"></a>
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89 <p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
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90 be called <em>after</em> <code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html#Combining-MPI-and-Threads">Combining MPI and Threads</a>). Calling <code>fftw_mpi_init</code> additional times (before
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91 <code>fftw_mpi_cleanup</code>) has no effect.
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92 </p>
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93
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94 <p>If you want to deallocate all persistent data and reset FFTW to the
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95 pristine state it was in when you started your program, you can call:
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96 </p>
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97 <a name="index-fftw_005fmpi_005fcleanup-1"></a>
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98 <div class="example">
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99 <pre class="example">void fftw_mpi_cleanup(void);
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100 </pre></div>
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101
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102 <a name="index-fftw_005fcleanup-1"></a>
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103 <p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
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104 cleanup routine too, although it is safe to do so.) After calling
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105 <code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
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106 should not attempt to execute or destroy them. You must call
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107 <code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
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108 to resume using the MPI FFTW routines.
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109 </p>
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110
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111
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112
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113 </body>
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114 </html>
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