mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-06 21:05:04 +00:00
97 lines
4.7 KiB
HTML
97 lines
4.7 KiB
HTML
<!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 3.3.10, 10 December 2020).
|
|
|
|
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 6.7, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>Advanced distributed-transpose interface (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="Advanced distributed-transpose interface (FFTW 3.3.10)">
|
|
<meta name="keywords" content="Advanced distributed-transpose interface (FFTW 3.3.10)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="FFTW-MPI-Transposes.html" rel="up" title="FFTW MPI Transposes">
|
|
<link href="An-improved-replacement-for-MPI_005fAlltoall.html" rel="next" title="An improved replacement for MPI_Alltoall">
|
|
<link href="Basic-distributed_002dtranspose-interface.html" rel="prev" title="Basic distributed-transpose interface">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {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}
|
|
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">
|
|
<span id="Advanced-distributed_002dtranspose-interface"></span><div class="header">
|
|
<p>
|
|
Next: <a href="An-improved-replacement-for-MPI_005fAlltoall.html" accesskey="n" rel="next">An improved replacement for MPI_Alltoall</a>, Previous: <a href="Basic-distributed_002dtranspose-interface.html" accesskey="p" rel="prev">Basic distributed-transpose interface</a>, Up: <a href="FFTW-MPI-Transposes.html" accesskey="u" rel="up">FFTW MPI Transposes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<span id="Advanced-distributed_002dtranspose-interface-1"></span><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’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>
|
|
<span id="index-fftw_005fmpi_005fplan_005fmany_005ftranspose"></span>
|
|
|
|
<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>.
|
|
<span id="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-1"></span>
|
|
<span id="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed"></span>
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|