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jeremybenn |
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><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="bk01pt03ch19s03.html" title="Extensions for Custom Containers"/><link rel="next" href="bk01pt03ch19s05.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 align="left"><a accesskey="p" href="bk01pt03ch19s03.html">Prev</a> </td><th width="60%" align="center">Chapter 19. Profile Mode</th><td align="right"> <a accesskey="n" href="bk01pt03ch19s05.html">Next</a></td></tr></table><hr/></div><div class="section" title="Empirical Cost Model"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.profile_mode.cost_model"/>Empirical Cost Model</h2></div></div></div><p>
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Currently, the cost model uses formulas with predefined relative weights
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for alternative containers or container implementations. For instance,
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iterating through a vector is X times faster than iterating through a list.
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</p><p>
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(Under development.)
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We are working on customizing this to a particular machine by providing
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an automated way to compute the actual relative weights for operations
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on the given machine.
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</p><p>
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(Under development.)
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We plan to provide a performance parameter database format that can be
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filled in either by hand or by an automated training mechanism.
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The analysis module will then use this database instead of the built in.
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generic parameters.
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</p></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="bk01pt03ch19s03.html">Prev</a> </td><td align="center"><a accesskey="u" href="profile_mode.html">Up</a></td><td align="right"> <a accesskey="n" href="bk01pt03ch19s05.html">Next</a></td></tr><tr><td align="left" valign="top">Extensions for Custom Containers </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Implementation Issues</td></tr></table></div></body></html>
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