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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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Chris@42 25 <title>FFTW 3.3.5: Advanced distributed-transpose interface</title>
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Chris@42 72 <a name="Advanced-distributed_002dtranspose-interface"></a>
Chris@42 73 <div class="header">
Chris@42 74 <p>
Chris@42 75 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>
Chris@42 76 </div>
Chris@42 77 <hr>
Chris@42 78 <a name="Advanced-distributed_002dtranspose-interface-1"></a>
Chris@42 79 <h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>
Chris@42 80
Chris@42 81 <p>The above routines are for a transpose of a matrix of numbers (of type
Chris@42 82 <code>double</code>), using FFTW&rsquo;s default block sizes. More generally, one
Chris@42 83 can perform transposes of <em>tuples</em> of numbers, with
Chris@42 84 user-specified block sizes for the input and output:
Chris@42 85 </p>
Chris@42 86 <div class="example">
Chris@42 87 <pre class="example">fftw_plan fftw_mpi_plan_many_transpose
Chris@42 88 (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
Chris@42 89 ptrdiff_t block0, ptrdiff_t block1,
Chris@42 90 double *in, double *out, MPI_Comm comm, unsigned flags);
Chris@42 91 </pre></div>
Chris@42 92 <a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose"></a>
Chris@42 93
Chris@42 94 <p>In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
Chris@42 95 <code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers).
Chris@42 96 The input is distributed along the <code>n0</code> dimension with block size
Chris@42 97 <code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
Chris@42 98 along the <code>n1</code> dimension with block size <code>block1</code>. If
Chris@42 99 <code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
Chris@42 100 uses its default block size. To get the local size of the data on
Chris@42 101 each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>.
Chris@42 102 <a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-1"></a>
Chris@42 103 <a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed"></a>
Chris@42 104 </p>
Chris@42 105
Chris@42 106
Chris@42 107
Chris@42 108 </body>
Chris@42 109 </html>