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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/Caveats-in-Using-Wisdom.html.svn-base	Wed May 04 11:02:59 2016 +0100
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-<h3 class="section">3.4 Caveats in Using Wisdom</h3>
-
-<p><a name="index-wisdom_002c-problems-with-130"></a>
-<blockquote>
-<i>For in much wisdom is much grief, and he that increaseth knowledge
-increaseth sorrow. 
-</i>[Ecclesiastes 1:18]
-<a name="index-Ecclesiastes-131"></a></blockquote>
-
-   <p><a name="index-portability-132"></a>There are pitfalls to using wisdom, in that it can negate FFTW's
-ability to adapt to changing hardware and other conditions. For
-example, it would be perfectly possible to export wisdom from a
-program running on one processor and import it into a program running
-on another processor.  Doing so, however, would mean that the second
-program would use plans optimized for the first processor, instead of
-the one it is running on.
-
-   <p>It should be safe to reuse wisdom as long as the hardware and program
-binaries remain unchanged. (Actually, the optimal plan may change even
-between runs of the same binary on identical hardware, due to
-differences in the virtual memory environment, etcetera.  Users
-seriously interested in performance should worry about this problem,
-too.)  It is likely that, if the same wisdom is used for two
-different program binaries, even running on the same machine, the
-plans may be sub-optimal because of differing code alignments.  It is
-therefore wise to recreate wisdom every time an application is
-recompiled.  The more the underlying hardware and software changes
-between the creation of wisdom and its use, the greater grows
-the risk of sub-optimal plans.
-
-   <p>Nevertheless, if the choice is between using <code>FFTW_ESTIMATE</code> or
-using possibly-suboptimal wisdom (created on the same machine, but for a
-different binary), the wisdom is likely to be better.  For this reason,
-we provide a function to import wisdom from a standard system-wide
-location (<code>/etc/fftw/wisdom</code> on Unix):
-<a name="index-wisdom_002c-system_002dwide-133"></a>
-<pre class="example">     int fftw_import_system_wisdom(void);
-</pre>
-   <p><a name="index-fftw_005fimport_005fsystem_005fwisdom-134"></a>
-FFTW also provides a standalone program, <code>fftw-wisdom</code> (described
-by its own <code>man</code> page on Unix) with which users can create wisdom,
-e.g. for a canonical set of sizes to store in the system wisdom file. 
-See <a href="Wisdom-Utilities.html#Wisdom-Utilities">Wisdom Utilities</a>. 
-<a name="index-fftw_002dwisdom-utility-135"></a>
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