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Current fftw source
| author | Chris Cannam <cannam@all-day-breakfast.com> |
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| date | Tue, 18 Oct 2016 13:40:26 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/fftw-3.3.5/doc/html/Advanced-distributed_002dtranspose-interface.html Tue Oct 18 13:40:26 2016 +0100 @@ -0,0 +1,109 @@ +<!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 3.3.5, 30 July 2016). + +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 5.2, http://www.gnu.org/software/texinfo/ --> +<head> +<title>FFTW 3.3.5: Advanced distributed-transpose interface</title> + +<meta name="description" content="FFTW 3.3.5: Advanced distributed-transpose interface"> +<meta name="keywords" content="FFTW 3.3.5: 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.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<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> [<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’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>