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2 <head>
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3 <title>Advanced distributed-transpose interface - FFTW 3.3.3</title>
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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-Transposes.html#FFTW-MPI-Transposes" title="FFTW MPI Transposes">
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9 <link rel="prev" href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface" title="Basic distributed-transpose interface">
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10 <link rel="next" href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall" title="An improved replacement for MPI_Alltoall">
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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="Advanced-distributed-transpose-interface"></a>
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50 <a name="Advanced-distributed_002dtranspose-interface"></a>
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51 <p>
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52 Next: <a rel="next" accesskey="n" href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall">An improved replacement for MPI_Alltoall</a>,
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53 Previous: <a rel="previous" accesskey="p" href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface">Basic distributed-transpose interface</a>,
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54 Up: <a rel="up" accesskey="u" href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes">FFTW MPI Transposes</a>
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55 <hr>
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56 </div>
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57
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58 <h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>
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59
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60 <p>The above routines are for a transpose of a matrix of numbers (of type
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61 <code>double</code>), using FFTW's default block sizes. More generally, one
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62 can perform transposes of <em>tuples</em> of numbers, with
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63 user-specified block sizes for the input and output:
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64
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65 <pre class="example"> fftw_plan fftw_mpi_plan_many_transpose
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66 (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
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67 ptrdiff_t block0, ptrdiff_t block1,
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68 double *in, double *out, MPI_Comm comm, unsigned flags);
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69 </pre>
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70 <p><a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose-403"></a>
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71 In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
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72 <code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers).
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73 The input is distributed along the <code>n0</code> dimension with block size
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74 <code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
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75 along the <code>n1</code> dimension with block size <code>block1</code>. If
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76 <code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
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77 uses its default block size. To get the local size of the data on
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78 each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>.
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79 <a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-404"></a><a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed-405"></a>
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80
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81 </body></html>
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82
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