119 lines
5.9 KiB
HTML
119 lines
5.9 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>Using MPI Plans (FFTW 3.3.10)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Using MPI Plans (FFTW 3.3.10)">
|
||
|
|
<meta name="keywords" content="Using MPI Plans (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-Reference.html" rel="up" title="FFTW MPI Reference">
|
||
|
|
<link href="MPI-Data-Distribution-Functions.html" rel="next" title="MPI Data Distribution Functions">
|
||
|
|
<link href="MPI-Initialization.html" rel="prev" title="MPI Initialization">
|
||
|
|
<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="Using-MPI-Plans"></span><div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="MPI-Data-Distribution-Functions.html" accesskey="n" rel="next">MPI Data Distribution Functions</a>, Previous: <a href="MPI-Initialization.html" accesskey="p" rel="prev">MPI Initialization</a>, Up: <a href="FFTW-MPI-Reference.html" accesskey="u" rel="up">FFTW MPI Reference</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="Using-MPI-Plans-1"></span><h4 class="subsection">6.12.3 Using MPI Plans</h4>
|
||
|
|
|
||
|
|
<p>Once an MPI plan is created, you can execute and destroy it using
|
||
|
|
<code>fftw_execute</code>, <code>fftw_destroy_plan</code>, and the other functions
|
||
|
|
in the serial interface that operate on generic plans (see <a href="Using-Plans.html">Using Plans</a>).
|
||
|
|
</p>
|
||
|
|
<span id="index-collective-function-3"></span>
|
||
|
|
<span id="index-MPI-communicator-1"></span>
|
||
|
|
<p>The <code>fftw_execute</code> and <code>fftw_destroy_plan</code> functions, applied to
|
||
|
|
MPI plans, are <em>collective</em> calls: they must be called for all processes
|
||
|
|
in the communicator that was used to create the plan.
|
||
|
|
</p>
|
||
|
|
<span id="index-new_002darray-execution-1"></span>
|
||
|
|
<p>You must <em>not</em> use the serial new-array plan-execution functions
|
||
|
|
<code>fftw_execute_dft</code> and so on (see <a href="New_002darray-Execute-Functions.html">New-array Execute Functions</a>) with MPI plans. Such functions are specialized to the
|
||
|
|
problem type, and there are specific new-array execute functions for MPI plans:
|
||
|
|
</p>
|
||
|
|
<span id="index-fftw_005fmpi_005fexecute_005fdft"></span>
|
||
|
|
<span id="index-fftw_005fmpi_005fexecute_005fdft_005fr2c"></span>
|
||
|
|
<span id="index-fftw_005fmpi_005fexecute_005fdft_005fc2r"></span>
|
||
|
|
<span id="index-fftw_005fmpi_005fexecute_005fr2r"></span>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example">void fftw_mpi_execute_dft(fftw_plan p, fftw_complex *in, fftw_complex *out);
|
||
|
|
void fftw_mpi_execute_dft_r2c(fftw_plan p, double *in, fftw_complex *out);
|
||
|
|
void fftw_mpi_execute_dft_c2r(fftw_plan p, fftw_complex *in, double *out);
|
||
|
|
void fftw_mpi_execute_r2r(fftw_plan p, double *in, double *out);
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<span id="index-alignment-3"></span>
|
||
|
|
<span id="index-fftw_005fmalloc-6"></span>
|
||
|
|
<p>These functions have the same restrictions as those of the serial
|
||
|
|
new-array execute functions. They are <em>always</em> safe to apply to
|
||
|
|
the <em>same</em> <code>in</code> and <code>out</code> arrays that were used to
|
||
|
|
create the plan. They can only be applied to new arrarys if those
|
||
|
|
arrays have the same types, dimensions, in-placeness, and alignment as
|
||
|
|
the original arrays, where the best way to ensure the same alignment
|
||
|
|
is to use FFTW’s <code>fftw_malloc</code> and related allocation functions
|
||
|
|
for all arrays (see <a href="Memory-Allocation.html">Memory Allocation</a>). Note that distributed
|
||
|
|
transposes (see <a href="FFTW-MPI-Transposes.html">FFTW MPI Transposes</a>) use
|
||
|
|
<code>fftw_mpi_execute_r2r</code>, since they count as rank-zero r2r plans
|
||
|
|
from FFTW’s perspective.
|
||
|
|
</p>
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="MPI-Data-Distribution-Functions.html" accesskey="n" rel="next">MPI Data Distribution Functions</a>, Previous: <a href="MPI-Initialization.html" accesskey="p" rel="prev">MPI Initialization</a>, Up: <a href="FFTW-MPI-Reference.html" accesskey="u" rel="up">FFTW MPI Reference</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>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|