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Finally adding the minmax library. Still allowing overlap with header
minmax.hpp from Eric Niebler, which should be resolved soon. --Herve' [SVN r23225]
This commit is contained in:
Hervé Brönnimann
524
minmax/doc/minmax_benchs.html
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minmax/doc/minmax_benchs.html
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="GENERATOR" content="Mozilla/4.77 [en] (X11; U; Linux 2.2.19 i686) [Netscape]">
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<meta name="Author" content="Herve Bronnimann">
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<meta name="Description" content="Small library to propose minmax_element algorithm.">
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<title>Boost minmax library</title>
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</head>
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<body text="#000000" bgcolor="#FFFFFF" link="#0000EE" vlink="#551A8B" alink="#FF0000">
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<center>
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<h1>
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Minmax_element Performance</h1></center>
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<h3>
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<a NAME="Performance"></a><b>About performance</b></h3>
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Of course, there are many factors that affect the performance of an algorithm.
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The number of comparison is only one, but also branch prediction, pipelining,
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locality of reference (affects cache efficiency), etc. In practice,
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we observe that when the iterator type is a pointer,
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<tt>boost::minmax_element</tt>
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is only a tad slower than
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<tt>std::min_element</tt>, and is even faster
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than
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<tt>boost::first_min_last_max_element</tt>! This is even more true
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for slower iterators (<tt>list<>::iterator</tt> or
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<tt>map<>iterator</tt>
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for instance). The following experiments were conducted on a Pentium III
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500 Mhz running Linux and compiled with g++, version 2.95.2, flags -O3.
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In the tables, we use different distributions: <i>Identical</i> means that
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all the elements are identical, <i>2-valued</i> means that we replace the
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second half of the identical elements by a distinct element, <i>increasing</i>
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means that all the elements are distinct and in increasing order, <i>decrea</i>sing
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is the reverse, and <i>random</i> is produced by random_shuffle.
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<br>
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The program that created these tables is included in the distribution,
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under <a href=""../example/minmax_timer.cpp"">minmax_timer.cpp</a>
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<br>
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<center><table BORDER NOSAVE >
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<tr NOSAVE>
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<td NOSAVE><b>vector<int>::iterator</b></td>
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<td>Identical</td>
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<td>2-valued</td>
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<td>Increasing</td>
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<td>Decreasing</td>
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<td>Random</td>
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</tr>
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<tr>
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<td>std::min_element</td>
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<td>23.26M/s</td>
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<td>23.26M/s</td>
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<td>23.15M/s</td>
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<td>22.94M/s</td>
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<td>22.94M/s</td>
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</tr>
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<tr>
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<td>std::max_element</td>
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<td>23.26M/s</td>
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<td>23.26M/s</td>
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<td>23.15M/s</td>
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<td>22.94M/s</td>
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<td>22.62M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_element</td>
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<td>23.15M/s</td>
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<td>23.04M/s</td>
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<td>23.04M/s</td>
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<td>22.94M/s</td>
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<td>22.83M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_element</td>
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<td>23.26M/s</td>
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<td>23.26M/s</td>
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<td>23.26M/s</td>
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<td>22.83M/s</td>
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<td>16.23M/s</td>
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</tr>
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<tr>
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<td>boost::first_max_element</td>
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<td>23.15M/s</td>
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<td>23.26M/s</td>
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<td>23.15M/s</td>
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<td>23.04M/s</td>
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<td>22.93M/s</td>
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</tr>
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<tr>
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<td>boost::last_max_element</td>
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<td>23.26M/s</td>
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<td>23.15M/s</td>
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<td>23.15M/s</td>
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<td>22.94M/s</td>
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<td>16.18M/s</td>
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</tr>
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<tr>
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<td>boost::minmax_element</td>
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<td>21.83M/s</td>
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<td>21.83M/s</td>
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<td>21.83M/s</td>
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<td>21.55M/s</td>
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<td>17.79M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_last_max_element</td>
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<td>18.52M/s</td>
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<td>18.38M/s</td>
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<td>18.38M/s</td>
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<td>18.94M/s</td>
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<td>16.29M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_first_max_element</td>
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<td>20.08M/s</td>
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<td>20.83M/s</td>
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<td>20.75M/s</td>
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<td>19.76M/s</td>
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<td>15.87M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_last_max_element</td>
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<td>18.66M/s</td>
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<td>19.69M/s</td>
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<td>19.69M/s</td>
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<td>19.23M/s</td>
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<td>15.77M/s</td>
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</tr>
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<caption ALIGN=BOTTOM>Number of elements per second for standard vector
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container iterators</caption>
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</table></center>
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<center><table BORDER NOSAVE >
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<tr NOSAVE>
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<td NOSAVE><b>list<int>::iterator</b></td>
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<td>Identical</td>
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<td>2-valued</td>
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<td>Increasing</td>
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<td>Decreasing</td>
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<td>Random</td>
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</tr>
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<tr>
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<td>std::min_element</td>
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<td>5.8M/s</td>
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<td>5.8M/s</td>
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<td>5.80M/s</td>
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<td>5.73M/s</td>
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<td>5.73M/s</td>
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</tr>
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<tr>
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<td>std::max_element</td>
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<td>5.81M/s</td>
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<td>5.81M/s</td>
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<td>5.78M/s</td>
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<td>5.73M/s</td>
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<td>5.75M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_element</td>
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<td>5.81M/s</td>
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<td>5.81M/s</td>
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<td>5.79M/s</td>
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<td>5.75M/s</td>
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<td>5.73M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_element</td>
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<td>5.81M/s</td>
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<td>5.80M/s</td>
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<td>5.79M/s</td>
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<td>5.73M/s</td>
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<td>5.03M/s</td>
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</tr>
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<tr>
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<td>boost::first_max_element</td>
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<td>5.81M/s</td>
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<td>5.80M/s</td>
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<td>5.78M/s</td>
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<td>5.74M/s</td>
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<td>5.73M/s</td>
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</tr>
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<tr>
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<td>boost::last_max_element</td>
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<td>5.81M/s</td>
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<td>5.80M/s</td>
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<td>5.79M/s</td>
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<td>5.73M/s</td>
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<td>5.07M/s</td>
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</tr>
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<tr>
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<td>boost::minmax_element</td>
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<td>5.68M/s</td>
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<td>5.80M/s</td>
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<td>5.66M/s</td>
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<td>5.74M/s</td>
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<td>5.30M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_last_max_element</td>
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<td>5.79M/s</td>
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<td>5.81M/s</td>
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<td>5.78M/s</td>
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<td>5.73M/s</td>
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<td>5.04M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_first_max_element</td>
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<td>5.69M/s</td>
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<td>5.79M/s</td>
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<td>5.69M/s</td>
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<td>5.73M/s</td>
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<td>4.84M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_last_max_element</td>
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<td>5.61M/s</td>
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<td>5.79M/s</td>
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<td>5.64M/s</td>
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<td>5.74M/s</td>
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<td>4.75M/s</td>
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</tr>
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<caption ALIGN=BOTTOM>Runtimes for standard list container iterators</caption>
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</table></center>
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<center><table BORDER NOSAVE >
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<tr NOSAVE>
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<td NOSAVE><b>multiset<int>::iterator</b></td>
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<td>Identical</td>
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<td>2-valued</td>
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<td>Increasing</td>
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<td>Decreasing</td>
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<td>Random</td>
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</tr>
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<tr>
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<td>std::min_element</td>
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<td>4.03M/s</td>
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<td>4.04M/s</td>
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<td>4.02M/s</td>
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<td>4.04M/s</td>
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<td>2.97M/s</td>
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</tr>
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<tr>
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<td>std::max_element3.007M</td>
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<td>4.02M/s</td>
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<td>4.02M/s</td>
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<td>4.01M/s</td>
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<td>4.02M/s</td>
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<td>2.96M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_element</td>
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<td>4.01M/s</td>
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<td>4.04M/s</td>
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<td>4.03M/s</td>
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<td>4.04M/s</td>
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<td>3.01M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_element</td>
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<td>4.03M/s</td>
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<td>4.04M/s</td>
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<td>4.04M/s</td>
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<td>4.04M/s</td>
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<td>3.00M/s</td>
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</tr>
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<tr>
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<td>boost::first_max_element</td>
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<td>4.04M/s</td>
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<td>4.04M/s</td>
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<td>4.04M/s</td>
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<td>4.06M/s</td>
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<td>3.01M/s</td>
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</tr>
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<tr>
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<td>boost::last_max_element</td>
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<td>4.04M/s</td>
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<td>4.04M/s</td>
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<td>4.03M/s</td>
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<td>4.04M/s</td>
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<td>3.00M/s</td>
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</tr>
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<tr>
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<td>boost::minmax_element</td>
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<td>3.98M/s</td>
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<td>3.99M/s</td>
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<td>3.98M/s</td>
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<td>3.99M/s</td>
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<td>3.00M/s</td>
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</tr>
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<tr>
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<td>boost::first_min_last_max_element</td>
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<td>3.99M/s</td>
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<td>3.98M/s</td>
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<td>3.97M/s</td>
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<td>3.99M/s</td>
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<td>2.99M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_first_max_element</td>
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<td>3.97M/s</td>
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<td>3.98M/s</td>
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<td>3.96M/s</td>
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<td>3.98M/s</td>
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<td>3.00M/s</td>
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</tr>
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<tr>
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<td>boost::last_min_last_max_element</td>
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<td>4.00M/s</td>
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<td>4.00M/s</td>
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<td>4.00M/s</td>
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<td>4.02M/s</td>
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<td>2.97M/s</td>
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</tr>
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<caption ALIGN=BOTTOM>Runtimes for standard set/multiset container iterators</caption>
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</table></center>
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<hr SIZE="6">
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<br>Last modified 2004-06-28
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<p><font face="Arial,Helvetica"><font size=-1>© Copyright Hervé
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Brönnimann, Polytechnic University, 2002--2004. Permission to copy, use,
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||||
modify, sell and distribute this software and its documentation is granted
|
||||
provided this copyright notice appears in all copies. This software and
|
||||
its documentation is provided "as is" without express or implied warranty,
|
||||
and with no claim as to its suitability for any purpose.</font></font>
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||||
</body>
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||||
</html>
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||||
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