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2 <head>
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3 <title>Linking and Initializing MPI FFTW - FFTW 3.3.4</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.4">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI" title="Distributed-memory FFTW with MPI">
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9 <link rel="prev" href="FFTW-MPI-Installation.html#FFTW-MPI-Installation" title="FFTW MPI Installation">
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10 <link rel="next" href="2d-MPI-example.html#g_t2d-MPI-example" title="2d MPI example">
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11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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12 <!--
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13 This manual is for FFTW
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14 (version 3.3.4, 20 September 2013).
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15
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16 Copyright (C) 2003 Matteo Frigo.
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17
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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19
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20 Permission is granted to make and distribute verbatim copies of
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21 this manual provided the copyright notice and this permission
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22 notice are preserved on all copies.
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23
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24 Permission is granted to copy and distribute modified versions of
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25 this manual under the conditions for verbatim copying, provided
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26 that the entire resulting derived work is distributed under the
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27 terms of a permission notice identical to this one.
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28
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29 Permission is granted to copy and distribute translations of this
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30 manual into another language, under the above conditions for
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31 modified versions, except that this permission notice may be
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32 stated in a translation approved by the Free Software Foundation.
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45 --></style>
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46 </head>
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47 <body>
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48 <div class="node">
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49 <a name="Linking-and-Initializing-MPI-FFTW"></a>
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50 <p>
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51 Next: <a rel="next" accesskey="n" href="2d-MPI-example.html#g_t2d-MPI-example">2d MPI example</a>,
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52 Previous: <a rel="previous" accesskey="p" href="FFTW-MPI-Installation.html#FFTW-MPI-Installation">FFTW MPI Installation</a>,
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53 Up: <a rel="up" accesskey="u" href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI">Distributed-memory FFTW with MPI</a>
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54 <hr>
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55 </div>
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56
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57 <h3 class="section">6.2 Linking and Initializing MPI FFTW</h3>
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58
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59 <p>Programs using the MPI FFTW routines should be linked with
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60 <code>-lfftw3_mpi -lfftw3 -lm</code> on Unix in double precision,
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61 <code>-lfftw3f_mpi -lfftw3f -lm</code> in single precision, and so on
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62 (see <a href="Precision.html#Precision">Precision</a>). You will also need to link with whatever library
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63 is responsible for MPI on your system; in most MPI implementations,
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64 there is a special compiler alias named <code>mpicc</code> to compile and
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65 link MPI code.
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66 <a name="index-mpicc-354"></a><a name="index-linking-on-Unix-355"></a><a name="index-precision-356"></a>
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67
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68 <p><a name="index-fftw_005finit_005fthreads-357"></a>Before calling any FFTW routines except possibly
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69 <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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70 <code>MPI_Init</code>, you should call the function:
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71
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72 <pre class="example"> void fftw_mpi_init(void);
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73 </pre>
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74 <p><a name="index-fftw_005fmpi_005finit-358"></a>
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75 If, at the end of your program, you want to get rid of all memory and
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76 other resources allocated internally by FFTW, for both the serial and
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77 MPI routines, you can call:
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78
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79 <pre class="example"> void fftw_mpi_cleanup(void);
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80 </pre>
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81 <p><a name="index-fftw_005fmpi_005fcleanup-359"></a>
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82 which is much like the <code>fftw_cleanup()</code> function except that it
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83 also gets rid of FFTW's MPI-related data. You must <em>not</em> execute
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84 any previously created plans after calling this function.
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85
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86 <!-- -->
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87 </body></html>
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88
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