Mercurial > hg > sv-dependency-builds

comparison src/fftw-3.3.5/doc/html/Advanced-distributed_002dtranspose-interface.html @ 127:7867fa7e1b6b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
parents
children
comparison
equal deleted inserted replaced
126:4a7071416412 127:7867fa7e1b6b
1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2 <html>
3 <!-- This manual is for FFTW
4 (version 3.3.5, 30 July 2016).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
9
10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
12 preserved on all copies.
13
14 Permission is granted to copy and distribute modified versions of this
15 manual under the conditions for verbatim copying, provided that the
16 entire resulting derived work is distributed under the terms of a
17 permission notice identical to this one.
18
19 Permission is granted to copy and distribute translations of this manual
20 into another language, under the above conditions for modified versions,
21 except that this permission notice may be stated in a translation
22 approved by the Free Software Foundation. -->
23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.5: Advanced distributed-transpose interface</title>
26
27 <meta name="description" content="FFTW 3.3.5: Advanced distributed-transpose interface">
28 <meta name="keywords" content="FFTW 3.3.5: Advanced distributed-transpose interface">
29 <meta name="resource-type" content="document">
30 <meta name="distribution" content="global">
31 <meta name="Generator" content="makeinfo">
32 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
33 <link href="index.html#Top" rel="start" title="Top">
34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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">
38 <link href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface" rel="prev" title="Basic distributed-transpose interface">
39 <style type="text/css">
40 <!--
41 a.summary-letter {text-decoration: none}
42 blockquote.smallquotation {font-size: smaller}
43 div.display {margin-left: 3.2em}
44 div.example {margin-left: 3.2em}
45 div.indentedblock {margin-left: 3.2em}
46 div.lisp {margin-left: 3.2em}
47 div.smalldisplay {margin-left: 3.2em}
48 div.smallexample {margin-left: 3.2em}
49 div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
50 div.smalllisp {margin-left: 3.2em}
51 kbd {font-style:oblique}
52 pre.display {font-family: inherit}
53 pre.format {font-family: inherit}
54 pre.menu-comment {font-family: serif}
55 pre.menu-preformatted {font-family: serif}
56 pre.smalldisplay {font-family: inherit; font-size: smaller}
57 pre.smallexample {font-size: smaller}
58 pre.smallformat {font-family: inherit; font-size: smaller}
59 pre.smalllisp {font-size: smaller}
60 span.nocodebreak {white-space:nowrap}
61 span.nolinebreak {white-space:nowrap}
62 span.roman {font-family:serif; font-weight:normal}
63 span.sansserif {font-family:sans-serif; font-weight:normal}
64 ul.no-bullet {list-style: none}
65 -->
66 </style>
67
68
69 </head>
70
71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
72 <a name="Advanced-distributed_002dtranspose-interface"></a>
73 <div class="header">
74 <p>
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>
76 </div>
77 <hr>
78 <a name="Advanced-distributed_002dtranspose-interface-1"></a>
79 <h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>
80
81 <p>The above routines are for a transpose of a matrix of numbers (of type
82 <code>double</code>), using FFTW&rsquo;s default block sizes. More generally, one
83 can perform transposes of <em>tuples</em> of numbers, with
84 user-specified block sizes for the input and output:
85 </p>
86 <div class="example">
87 <pre class="example">fftw_plan fftw_mpi_plan_many_transpose
88 (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
89 ptrdiff_t block0, ptrdiff_t block1,
90 double *in, double *out, MPI_Comm comm, unsigned flags);
91 </pre></div>
92 <a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose"></a>
93
94 <p>In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
95 <code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers).
96 The input is distributed along the <code>n0</code> dimension with block size
97 <code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
98 along the <code>n1</code> dimension with block size <code>block1</code>. If
99 <code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
100 uses its default block size. To get the local size of the data on
101 each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>.
102 <a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-1"></a>
103 <a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed"></a>
104 </p>
105
106
107
108 </body>
109 </html>