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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: Linking and Initializing MPI FFTW</title>
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26
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27 <meta name="description" content="FFTW 3.3.8: Linking and Initializing MPI FFTW">
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28 <meta name="keywords" content="FFTW 3.3.8: Linking and Initializing MPI FFTW">
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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="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI" rel="up" title="Distributed-memory FFTW with MPI">
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37 <link href="2d-MPI-example.html#g_t2d-MPI-example" rel="next" title="2d MPI example">
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38 <link href="FFTW-MPI-Installation.html#FFTW-MPI-Installation" rel="prev" title="FFTW MPI Installation">
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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="Linking-and-Initializing-MPI-FFTW"></a>
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72 <div class="header">
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73 <p>
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74 Next: <a href="2d-MPI-example.html#g_t2d-MPI-example" accesskey="n" rel="next">2d MPI example</a>, Previous: <a href="FFTW-MPI-Installation.html#FFTW-MPI-Installation" accesskey="p" rel="prev">FFTW MPI Installation</a>, Up: <a href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI" accesskey="u" rel="up">Distributed-memory FFTW with MPI</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="Linking-and-Initializing-MPI-FFTW-1"></a>
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78 <h3 class="section">6.2 Linking and Initializing MPI FFTW</h3>
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79
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80 <p>Programs using the MPI FFTW routines should be linked with
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81 <code>-lfftw3_mpi -lfftw3 -lm</code> on Unix in double precision,
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82 <code>-lfftw3f_mpi -lfftw3f -lm</code> in single precision, and so on
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83 (see <a href="Precision.html#Precision">Precision</a>). You will also need to link with whatever library
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84 is responsible for MPI on your system; in most MPI implementations,
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85 there is a special compiler alias named <code>mpicc</code> to compile and
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86 link MPI code.
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87 <a name="index-mpicc-1"></a>
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88 <a name="index-linking-on-Unix-1"></a>
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89 <a name="index-precision-5"></a>
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90 </p>
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91
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92 <a name="index-fftw_005finit_005fthreads-1"></a>
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93 <p>Before calling any FFTW routines except possibly
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94 <code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html#Combining-MPI-and-Threads">Combining MPI and Threads</a>), but after calling
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95 <code>MPI_Init</code>, you should call the function:
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96 </p>
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97 <div class="example">
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98 <pre class="example">void fftw_mpi_init(void);
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99 </pre></div>
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100 <a name="index-fftw_005fmpi_005finit"></a>
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101
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102 <p>If, at the end of your program, you want to get rid of all memory and
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103 other resources allocated internally by FFTW, for both the serial and
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104 MPI routines, you can call:
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105 </p>
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106 <div class="example">
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107 <pre class="example">void fftw_mpi_cleanup(void);
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108 </pre></div>
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109 <a name="index-fftw_005fmpi_005fcleanup"></a>
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110
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111 <p>which is much like the <code>fftw_cleanup()</code> function except that it
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112 also gets rid of FFTW’s MPI-related data. You must <em>not</em> execute
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113 any previously created plans after calling this function.
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114 </p>
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115
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116
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117
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118 </body>
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119 </html>
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