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1 <html lang="en">
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2 <head>
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3 <title>Using MPI Plans - 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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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="MPI-Initialization.html#MPI-Initialization" title="MPI Initialization">
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10 <link rel="next" href="MPI-Data-Distribution-Functions.html#MPI-Data-Distribution-Functions" title="MPI Data Distribution Functions">
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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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35 <style type="text/css"><!--
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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="Using-MPI-Plans"></a>
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50 <p>
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51 Next: <a rel="next" accesskey="n" href="MPI-Data-Distribution-Functions.html#MPI-Data-Distribution-Functions">MPI Data Distribution Functions</a>,
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52 Previous: <a rel="previous" accesskey="p" href="MPI-Initialization.html#MPI-Initialization">MPI Initialization</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">6.12.3 Using MPI Plans</h4>
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58
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59 <p>Once an MPI plan is created, you can execute and destroy it using
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60 <code>fftw_execute</code>, <code>fftw_destroy_plan</code>, and the other functions
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61 in the serial interface that operate on generic plans (see <a href="Using-Plans.html#Using-Plans">Using Plans</a>).
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62
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63 <p><a name="index-collective-function-438"></a><a name="index-MPI-communicator-439"></a>The <code>fftw_execute</code> and <code>fftw_destroy_plan</code> functions, applied to
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64 MPI plans, are <em>collective</em> calls: they must be called for all processes
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65 in the communicator that was used to create the plan.
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66
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67 <p><a name="index-new_002darray-execution-440"></a>You must <em>not</em> use the serial new-array plan-execution functions
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68 <code>fftw_execute_dft</code> and so on (see <a href="New_002darray-Execute-Functions.html#New_002darray-Execute-Functions">New-array Execute Functions</a>) with MPI plans. Such functions are specialized to the
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69 problem type, and there are specific new-array execute functions for MPI plans:
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70
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71 <p><a name="index-fftw_005fmpi_005fexecute_005fdft-441"></a><a name="index-fftw_005fmpi_005fexecute_005fdft_005fr2c-442"></a><a name="index-fftw_005fmpi_005fexecute_005fdft_005fc2r-443"></a><a name="index-fftw_005fmpi_005fexecute_005fr2r-444"></a>
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72 <pre class="example"> void fftw_mpi_execute_dft(fftw_plan p, fftw_complex *in, fftw_complex *out);
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73 void fftw_mpi_execute_dft_r2c(fftw_plan p, double *in, fftw_complex *out);
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74 void fftw_mpi_execute_dft_c2r(fftw_plan p, fftw_complex *in, double *out);
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75 void fftw_mpi_execute_r2r(fftw_plan p, double *in, double *out);
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76 </pre>
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77 <p><a name="index-alignment-445"></a><a name="index-fftw_005fmalloc-446"></a>These functions have the same restrictions as those of the serial
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78 new-array execute functions. They are <em>always</em> safe to apply to
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79 the <em>same</em> <code>in</code> and <code>out</code> arrays that were used to
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80 create the plan. They can only be applied to new arrarys if those
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81 arrays have the same types, dimensions, in-placeness, and alignment as
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82 the original arrays, where the best way to ensure the same alignment
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83 is to use FFTW's <code>fftw_malloc</code> and related allocation functions
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84 for all arrays (see <a href="Memory-Allocation.html#Memory-Allocation">Memory Allocation</a>). Note that distributed
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85 transposes (see <a href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes">FFTW MPI Transposes</a>) use
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86 <code>fftw_mpi_execute_r2r</code>, since they count as rank-zero r2r plans
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87 from FFTW's perspective.
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88
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89 </body></html>
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90
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