ceph/src/boost/libs/context/doc/html/context/econtext/performance.html

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="context.econtext.performance"></a><a class="link" href="performance.html" title="Performance">Performance</a>
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  29 <p>
  30         Performance of <span class="bold"><strong>Boost.Context</strong></span> was measured
  31         on the platforms shown in the following table. Performance measurements were
  32         taken using <code class="computeroutput"><span class="identifier">rdtsc</span></code> and <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">high_resolution_clock</span></code>, with overhead corrections,
  33         on x86 platforms. In each case, cache warm-up was accounted for, and the
  34         one running thread was pinned to a single CPU. The code was compiled using
  35         the build options, 'variant = release cxxflags = -DBOOST_DISABLE_ASSERTS'.
  36       </p>
  37 <div class="table">
  38 <a name="context.econtext.performance.performance_of_context_switch"></a><p class="title"><b>Table&#160;1.1.&#160;Performance of context switch</b></p>
  39 <div class="table-contents"><table class="table" summary="Performance of context switch">
  40 <colgroup>
  41 <col>
  42 <col>
  43 <col>
  44 <col>
  45 </colgroup>
  46 <thead><tr>
  47 <th>
  48                 <p>
  49                   Platform
  50                 </p>
  51               </th>
  52 <th>
  53                 <p>
  54                   ucontext_t
  55                 </p>
  56               </th>
  57 <th>
  58                 <p>
  59                   fcontext_t
  60                 </p>
  61               </th>
  62 <th>
  63                 <p>
  64                   windows fibers
  65                 </p>
  66               </th>
  67 </tr></thead>
  68 <tbody>
  69 <tr>
  70 <td>
  71                 <p>
  72                   i386 <sup>[<a name="context.econtext.performance.f0" href="#ftn.context.econtext.performance.f0" class="footnote">a</a>]</sup>
  73                 </p>
  74               </td>
  75 <td>
  76                 <p>
  77                   708 ns / 754 cycles
  78                 </p>
  79               </td>
  80 <td>
  81                 <p>
  82                   37 ns / 37 cycles
  83                 </p>
  84               </td>
  85 <td>
  86                 <p>
  87                   ns / cycles
  88                 </p>
  89               </td>
  90 </tr>
  91 <tr>
  92 <td>
  93                 <p>
  94                   x86_64 <sup>[<a name="context.econtext.performance.f1" href="#ftn.context.econtext.performance.f1" class="footnote">b</a>]</sup>
  95                 </p>
  96               </td>
  97 <td>
  98                 <p>
  99                   547 ns / 1433 cycles
 100                 </p>
 101               </td>
 102 <td>
 103                 <p>
 104                   8 ns / 23 cycles
 105                 </p>
 106               </td>
 107 <td>
 108                 <p>
 109                   ns / cycles
 110                 </p>
 111               </td>
 112 </tr>
 113 </tbody>
 114 <tbody class="footnotes"><tr><td colspan="4">
 115 <div class="footnote"><p><sup>[<a name="ftn.context.econtext.performance.f0" href="#context.econtext.performance.f0" class="para">a</a>] </sup>
 116                     AMD Athlon 64 DualCore 4400+
 117                   </p></div>
 118 <div class="footnote"><p><sup>[<a name="ftn.context.econtext.performance.f1" href="#context.econtext.performance.f1" class="para">b</a>] </sup>
 119                     Intel Core2 Q6700
 120                   </p></div>
 121 </td></tr></tbody>
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 127 <td align="left"></td>
 128 <td align="right"><div class="copyright-footer">Copyright &#169; 2014 Oliver Kowalke<p>
 129         Distributed under the Boost Software License, Version 1.0. (See accompanying
 130         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 131       </p>
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