Sophie: libfftw-devel-3.3.8-3.mga7 armv7hl

libfftw-devel-3.3.8-3.mga7.armv7hl.rpm

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- This manual is for FFTW
(version 3.3.8, 24 May 2018).

Copyright (C) 2003 Matteo Frigo.

Copyright (C) 2003 Massachusetts Institute of Technology.

Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Permission is granted to copy and distribute translations of this manual
into another language, under the above conditions for modified versions,
except that this permission notice may be stated in a translation
approved by the Free Software Foundation. -->
<!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
<head>
<title>FFTW 3.3.8: Advanced distributed-transpose interface</title>

<meta name="description" content="FFTW 3.3.8: Advanced distributed-transpose interface">
<meta name="keywords" content="FFTW 3.3.8: Advanced distributed-transpose interface">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes" rel="up" title="FFTW MPI Transposes">
<link href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall" rel="next" title="An improved replacement for MPI_Alltoall">
<link href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface" rel="prev" title="Basic distributed-transpose interface">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en">
<a name="Advanced-distributed_002dtranspose-interface"></a>
<div class="header">
<p>
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>
</div>
<hr>
<a name="Advanced-distributed_002dtranspose-interface-1"></a>
<h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>

<p>The above routines are for a transpose of a matrix of numbers (of type
<code>double</code>), using FFTW&rsquo;s default block sizes.  More generally, one
can perform transposes of <em>tuples</em> of numbers, with
user-specified block sizes for the input and output:
</p>
<div class="example">
<pre class="example">fftw_plan fftw_mpi_plan_many_transpose
                (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
                 ptrdiff_t block0, ptrdiff_t block1,
                 double *in, double *out, MPI_Comm comm, unsigned flags);
</pre></div>
<a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose"></a>

<p>In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
<code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers).
The input is distributed along the <code>n0</code> dimension with block size
<code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
along the <code>n1</code> dimension with block size <code>block1</code>.  If
<code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
uses its default block size.  To get the local size of the data on
each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>.
<a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-1"></a>
<a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed"></a>
</p>



</body>
</html>