libstdc++-v3/doc/html/ext/pb_ds/tree_text_lor_find_find_timing_test.html

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   7 <title>Tree Text Locality of Reference Find Timing Test</title>
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  12 <h1>Tree-Based Locality-of-Reference Text <tt>find</tt> Find
  13     Timing Test</h1>
  14 <h2><a name="description" id="description">Description</a></h2>
  15 <p>This test inserts a number of values with keys from an
  16     arbitrary text ([ <a href="references.html#wickland96thirty">wickland96thirty</a> ]) into
  17     a container, then performs a series of finds using
  18     <tt>find</tt> . It is different than <a href="tree_text_find_find_timing_test.html">Tree-Based and
  19     Trie-Based Text <tt>find</tt> Find Timing Test</a> in the
  20     sequence of finds it performs: this test performs multiple
  21     <tt>find</tt> s on the same key before moving on to the next
  22     key. It measures the average time for <tt>find</tt> as a
  23     function of the number of values inserted.</p>
  24 <p>(The test was executed with <a href="http://gcc.gnu.org/viewcvs/*checkout*/trunk/libstdc%2B%2B-v3/testsuite/performance/ext/pb_ds/tree_text_lor_find_timing.cc"><tt>tree_text_lor_find_timing_test</tt></a>
  25     thirty_years_among_the_dead_preproc.txt 200 200 2100)</p>
  26 <h2><a name="purpose" id="purpose">Purpose</a></h2>
  27 <p>The test checks the effect of different underlying
  28     data structures in a locality-of-reference setting.</p>
  29 <h2><a name="results" id="results">Results</a></h2>
  30 <p>Figures <a href="#NTG">NTG</a>, <a href="#NTM">NTM</a>, and
  31     <a href="#NTL">NTL</a> show the results for the native and
  32     <tt>pb_ds</tt> tree-based types in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>, <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a> and
  33     <a href="assoc_performance_tests.html#local"><u>local</u></a>,
  34     respectively.</p>
  35 <div id="NTG_res_div">
  36 <div id="NTG_gcc">
  37 <div id="NTG_tree_text_lor_find_timing_test">
  38 <div id="NTG_assoc">
  39 <div id="NTG_Native_and_tree-based_locality-of-reference_text_find_timing_test_using__tt_find_455tt_"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTG" id="NTG"><img src="tree_text_lor_find_timing_test_gcc.png" alt="no image" /></a></h6>NTG: Native and tree-based locality-of-reference text find timing test using <tt>find</tt> - <a href="assoc_performance_tests.html#gcc">g++</a><p>In the above figure, the names in the legends have the following meaning:</p>
  40 <ol>
  41 <li>
  42 ov_tree_map-
  43 <a href="tree.html"><tt>tree</tt></a>
  44  with <tt>Tag</tt> = <a href="ov_tree_tag.html"><tt>ov_tree_tag</tt></a>
  45 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  46 </li>
  47 <li>
  48 rb_tree_map-
  49 <a href="tree.html"><tt>tree</tt></a>
  50  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
  51 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  52 </li>
  53 <li>
  54 n_map-
  55 <tt>std::map</tt></li>
  56 <li>
  57 splay_tree_map-
  58 <a href="tree.html"><tt>tree</tt></a>
  59  with <tt>Tag</tt> = <a href="splay_tree_tag.html"><tt>splay_tree_tag</tt></a>
  60 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  61 </li>
  62 </ol>
  63 </div><div style="width: 100%; height: 20px"></div></div>
  64 </div>
  65 </div>
  66 </div>
  67 </div>
  68 <div id="NTM_res_div">
  69 <div id="NTM_msvc">
  70 <div id="NTM_tree_text_lor_find_timing_test">
  71 <div id="NTM_assoc">
  72 <div id="NTM_Native_and_tree-based_locality-of-reference_text_find_timing_test_using__tt_find_455tt_"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTM" id="NTM"><img src="tree_text_lor_find_timing_test_msvc.png" alt="no image" /></a></h6>NTM: Native and tree-based locality-of-reference text find timing test using <tt>find</tt> - <a href="assoc_performance_tests.html#msvc">msvc++</a><p>In the above figure, the names in the legends have the following meaning:</p>
  73 <ol>
  74 <li>
  75 ov_tree_map-
  76 <a href="tree.html"><tt>tree</tt></a>
  77  with <tt>Tag</tt> = <a href="ov_tree_tag.html"><tt>ov_tree_tag</tt></a>
  78 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  79 </li>
  80 <li>
  81 rb_tree_map-
  82 <a href="tree.html"><tt>tree</tt></a>
  83  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
  84 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  85 </li>
  86 <li>
  87 n_map-
  88 <tt>std::map</tt></li>
  89 <li>
  90 splay_tree_map-
  91 <a href="tree.html"><tt>tree</tt></a>
  92  with <tt>Tag</tt> = <a href="splay_tree_tag.html"><tt>splay_tree_tag</tt></a>
  93 , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
  94 </li>
  95 </ol>
  96 </div><div style="width: 100%; height: 20px"></div></div>
  97 </div>
  98 </div>
  99 </div>
 100 </div>
 101 <div id="NTL_res_div">
 102 <div id="NTL_local">
 103 <div id="NTL_tree_text_lor_find_timing_test">
 104 <div id="NTL_assoc">
 105 <div id="NTL_Native_and_tree-based_locality-of-reference_text_find_timing_test_using__tt_find_455tt_"><div style = "border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTL" id= "NTL"><img src="tree_text_lor_find_timing_test_local.png" alt="no image" /></a></h6>NTL: Native and tree-based locality-of-reference text find timing test using <tt>find</tt> - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
 106 </div>
 107 </div>
 108 </div>
 109 </div>
 110 <h2><a name="observations" id="observations">Observations</a></h2>
 111 <p>For this setting, an ordered-vector tree ( <a href="tree.html"><tt>tree</tt></a>
 112     with <tt>Tag =</tt> <a href="ov_tree_tag.html"><tt>ov_tree_tag</tt></a> ), a
 113     red-black tree ( <a href="tree.html"><tt>tree</tt></a>
 114     with <tt>Tag =</tt> <a href="splay_tree_tag.html"><tt>rb_tree_tag</tt></a> ), and the
 115     native red-black tree all share approximately the same
 116     performance.</p>
 117 <p>A splay tree ( <a href="tree.html"><tt>tree</tt></a>
 118     with <tt>Tag =</tt> <a href="splay_tree_tag.html"><tt>splay_tree_tag</tt></a> ) does
 119     much better, since each (successful) find "bubbles" the
 120     corresponding node to the root of the tree.</p>
 121 <p><a href="assoc_performance_tests.html#tree_like_based_types">Observations::Tree-Like-Based
 122     Container Types</a> summarizes some observations on tree-based
 123     and trie-based containers.</p>
 124 </div>
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