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Tidy up for ROLI
author Geogaddi\David <d.m.ronan@qmul.ac.uk>
date Tue, 17 May 2016 18:50:19 +0100
parents 636c989477e7
children
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--- a/Lib/fftw-3.2.1/doc/html/.svn/text-base/Usage-of-Multi_002dthreaded-FFTW.html.svn-base	Wed May 04 11:02:59 2016 +0100
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-<title>Usage of Multi-threaded FFTW - FFTW 3.2.1</title>
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-
-<h3 class="section">5.2 Usage of Multi-threaded FFTW</h3>
-
-<p>Here, it is assumed that the reader is already familiar with the usage
-of the uniprocessor FFTW routines, described elsewhere in this manual. 
-We only describe what one has to change in order to use the
-multi-threaded routines.
-
-   <p>First, programs using the parallel complex transforms should be linked with
-<code>-lfftw3_threads -lfftw3 -lm</code> on Unix. You will also need to link
-with whatever library is responsible for threads on your system
-(e.g. <code>-lpthread</code> on GNU/Linux). 
-<a name="index-linking-on-Unix-321"></a>
-Second, before calling <em>any</em> FFTW routines, you should call the
-function:
-
-<pre class="example">     int fftw_init_threads(void);
-</pre>
-   <p><a name="index-fftw_005finit_005fthreads-322"></a>
-This function, which need only be called once, performs any one-time
-initialization required to use threads on your system.  It returns zero
-if there was some error (which should not happen under normal
-circumstances) and a non-zero value otherwise.
-
-   <p>Third, before creating a plan that you want to parallelize, you should
-call:
-
-<pre class="example">     void fftw_plan_with_nthreads(int nthreads);
-</pre>
-   <p><a name="index-fftw_005fplan_005fwith_005fnthreads-323"></a>
-The <code>nthreads</code> argument indicates the number of threads you want
-FFTW to use (or actually, the maximum number).  All plans subsequently
-created with any planner routine will use that many threads.  You can
-call <code>fftw_plan_with_nthreads</code>, create some plans, call
-<code>fftw_plan_with_nthreads</code> again with a different argument, and
-create some more plans for a new number of threads.  Plans already created
-before a call to <code>fftw_plan_with_nthreads</code> are unaffected.  If you
-pass an <code>nthreads</code> argument of <code>1</code> (the default), threads are
-disabled for subsequent plans.
-
-   <p>Given a plan, you then execute it as usual with
-<code>fftw_execute(plan)</code>, and the execution will use the number of
-threads specified when the plan was created.  When done, you destroy it
-as usual with <code>fftw_destroy_plan</code>.
-
-   <p>There is one additional routine: if you want to get rid of all memory
-and other resources allocated internally by FFTW, you can call:
-
-<pre class="example">     void fftw_cleanup_threads(void);
-</pre>
-   <p><a name="index-fftw_005fcleanup_005fthreads-324"></a>
-which is much like the <code>fftw_cleanup()</code> function except that it
-also gets rid of threads-related data.  You must <em>not</em> execute any
-previously created plans after calling this function.
-
-   <p>We should also mention one other restriction: if you save wisdom from a
-program using the multi-threaded FFTW, that wisdom <em>cannot be used</em>
-by a program using only the single-threaded FFTW (i.e. not calling
-<code>fftw_init_threads</code>).  See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.
-
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