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1 <html lang="en">
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2 <head>
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3 <title>MPI Files and Data Types - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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6 <meta name="generator" content="makeinfo 4.13">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" title="FFTW MPI Reference">
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9 <link rel="prev" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" title="FFTW MPI Reference">
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10 <link rel="next" href="MPI-Initialization.html#MPI-Initialization" title="MPI Initialization">
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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 3.3.3, 25 November 2012).
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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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33 -->
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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="MPI-Files-and-Data-Types"></a>
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50 <p>
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51 Next: <a rel="next" accesskey="n" href="MPI-Initialization.html#MPI-Initialization">MPI Initialization</a>,
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52 Previous: <a rel="previous" accesskey="p" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>,
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53 Up: <a rel="up" accesskey="u" href="FFTW-MPI-Reference.html#FFTW-MPI-Reference">FFTW MPI Reference</a>
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54 <hr>
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55 </div>
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56
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57 <h4 class="subsection">6.12.1 MPI Files and Data Types</h4>
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58
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59 <p>All programs using FFTW's MPI support should include its header file:
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60
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61 <pre class="example"> #include <fftw3-mpi.h>
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62 </pre>
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63 <p>Note that this header file includes the serial-FFTW <code>fftw3.h</code>
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64 header file, and also the <code>mpi.h</code> header file for MPI, so you
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65 need not include those files separately.
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66
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67 <p>You must also link to <em>both</em> the FFTW MPI library and to the
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68 serial FFTW library. On Unix, this means adding <code>-lfftw3_mpi
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69 -lfftw3 -lm</code> at the end of the link command.
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70
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71 <p><a name="index-precision-433"></a>Different precisions are handled as in the serial interface:
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72 See <a href="Precision.html#Precision">Precision</a>. That is, ‘<samp><span class="samp">fftw_</span></samp>’ functions become
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73 <code>fftwf_</code> (in single precision) etcetera, and the libraries become
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74 <code>-lfftw3f_mpi -lfftw3f -lm</code> etcetera on Unix. Long-double
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75 precision is supported in MPI, but quad precision (‘<samp><span class="samp">fftwq_</span></samp>’) is
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76 not due to the lack of MPI support for this type.
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77
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78 </body></html>
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79
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