1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3 4<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 5<head> 6<meta name="generator" content="HTML Tidy for Linux/x86 (vers 12 April 2005), see www.w3.org" /> 7<title>Tree Text Locality of Reference Find Timing Test</title> 8<meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> 9</head> 10<body> 11<div id="page"> 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> 42ov_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> 48rb_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> 54n_map- 55<tt>std::map</tt></li> 56<li> 57splay_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> 75ov_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> 81rb_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> 87n_map- 88<tt>std::map</tt></li> 89<li> 90splay_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> 125</body> 126</html> 127