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+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Empirical Cost Model</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1" /><meta name="keywords" content="C++, library, profile" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="profile_mode.html" title="Chapter 19. Profile Mode" /><link rel="prev" href="profile_mode_api.html" title="Extensions for Custom Containers" /><link rel="next" href="profile_mode_impl.html" title="Implementation Issues" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Empirical Cost Model</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="profile_mode_api.html">Prev</a> </td><th width="60%" align="center">Chapter 19. Profile Mode</th><td width="20%" align="right"> <a accesskey="n" href="profile_mode_impl.html">Next</a></td></tr></table><hr /></div><div class="section" title="Empirical Cost Model"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.ext.profile_mode.cost_model"></a>Empirical Cost Model</h2></div></div></div><p>
+ Currently, the cost model uses formulas with predefined relative weights
+ for alternative containers or container implementations. For instance,
+ iterating through a vector is X times faster than iterating through a list.
+ </p><p>
+ (Under development.)
+ We are working on customizing this to a particular machine by providing
+ an automated way to compute the actual relative weights for operations
+ on the given machine.
+ </p><p>
+ (Under development.)
+ We plan to provide a performance parameter database format that can be
+ filled in either by hand or by an automated training mechanism.
+ The analysis module will then use this database instead of the built in.
+ generic parameters.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="profile_mode_api.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="profile_mode.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="profile_mode_impl.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Extensions for Custom Containers </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Implementation Issues</td></tr></table></div></body></html>