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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam
date Tue, 19 Nov 2019 14:52:55 +0000
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3 <!-- This manual is for FFTW
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36 <link href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes" rel="up" title="FFTW MPI Transposes">
37 <link href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall" rel="next" title="An improved replacement for MPI_Alltoall">
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71 <a name="Advanced-distributed_002dtranspose-interface"></a>
72 <div class="header">
73 <p>
74 Next: <a href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall" accesskey="n" rel="next">An improved replacement for MPI_Alltoall</a>, Previous: <a href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface" accesskey="p" rel="prev">Basic distributed-transpose interface</a>, Up: <a href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes" accesskey="u" rel="up">FFTW MPI Transposes</a> &nbsp; [<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>
75 </div>
76 <hr>
77 <a name="Advanced-distributed_002dtranspose-interface-1"></a>
78 <h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>
79
80 <p>The above routines are for a transpose of a matrix of numbers (of type
81 <code>double</code>), using FFTW&rsquo;s default block sizes. More generally, one
82 can perform transposes of <em>tuples</em> of numbers, with
83 user-specified block sizes for the input and output:
84 </p>
85 <div class="example">
86 <pre class="example">fftw_plan fftw_mpi_plan_many_transpose
87 (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
88 ptrdiff_t block0, ptrdiff_t block1,
89 double *in, double *out, MPI_Comm comm, unsigned flags);
90 </pre></div>
91 <a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose"></a>
92
93 <p>In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
94 <code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers).
95 The input is distributed along the <code>n0</code> dimension with block size
96 <code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
97 along the <code>n1</code> dimension with block size <code>block1</code>. If
98 <code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
99 uses its default block size. To get the local size of the data on
100 each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>.
101 <a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-1"></a>
102 <a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed"></a>
103 </p>
104
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