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>"Multimap" Text Find Timing Test with Small Average 8 Secondary-Key to Primary-Key Ratio</title> 9<meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> 10</head> 11<body> 12<div id="page"> 13<h1>"Multimap" Text Find Timing Test with Small Average 14 Secondary-Key to Primary-Key Ratio</h1> 15<h2><a name="description" id="description">Description</a></h2> 16<p>This test inserts a number of pairs into a container. The 17 first item of each pair is a string from an arbitrary text 18 [<a href="references.html#wickland96thirty">wickland96thirty</a>], and 19 the second is a uniform i.i.d.integer. The container is a 20 "multimap" - it considers the first member of each pair as a 21 primary key, and the second member of each pair as a secondary 22 key (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative 23 Containers::Alternative to Multiple Equivalent Keys</a>). There 24 are 400 distinct primary keys, and the ratio of secondary keys 25 to primary keys ranges from 1 to 5.</p> 26<p>The test measures the average find-time as a function of the 27 number of values inserted. For <tt>pb_ds</tt>'s containers, it 28 finds the secondary key from a container obtained from finding 29 a primary key. For the native multimaps, it searches a range 30 obtained using <tt>std::equal_range</tt> on a primary key.</p> 31<p>(The test was executed with <a href="http://gcc.gnu.org/viewcvs/*checkout*/trunk/libstdc%2B%2B-v3/testsuite/performance/ext/pb_ds/multimap_text_find_timing_small.cc"><tt>multimap_text_find_timing_test</tt></a> 32 thirty_years_among_the_dead_preproc.txt 400 1 1 6)</p> 33<h2><a name="purpose" id="purpose">Purpose</a></h2> 34<p>The test checks the find-time scalability of different 35 "multimap" designs (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative 36 Containers::Mapping Semantics</a>).</p> 37<h2><a name="results" id="results">Results</a></h2> 38<p>Figures <a href="#NTG">NTG</a>, <a href="#NTM">NTM</a>, and 39 <a href="#NTL">NTL</a> show the results for "multimaps" which 40 use a tree-based container for primary keys, in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>, <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a>, and 41 <a href="assoc_performance_tests.html#local"><u>local</u></a>, 42 respectively; Figures <a href="#NHG"></a>NHG, <a href="#NHM">NHM</a>, and <a href="#NHL">NHL</a> show the results for 43 "multimaps" which use a hash-based container for primary keys, 44 in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>, 45 <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a>, 46 and <a href="assoc_performance_tests.html#local"><u>local</u></a>, 47 respectively.</p> 48<div id="NTG_res_div"> 49<div id="NTG_gcc"> 50<div id="NTG_multimap_text_find_timing_test_small_s2p_tree"> 51<div id="NTG_assoc"> 52<div id="NHG_Native_and_primary_tree-based_multimap_types_find_timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTG" id="NTG"><img src="multimap_text_find_timing_test_small_s2p_tree_gcc.png" alt="no image" /></a></h6>NTG: NHG Native and primary tree-based multimap types find timing test - <a href="assoc_performance_tests.html#gcc">g++</a><p>In the above figure, the names in the legends have the following meaning:</p> 53<ol> 54<li> 55n_mmap- 56<tt>std::multimap</tt></li> 57<li> 58rb_tree_mmap_lu_mtf_set- 59<a href="tree.html"><tt>tree</tt></a> 60 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 61, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 62, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 63 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 64</li> 65<li> 66rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 67<a href="tree.html"><tt>tree</tt></a> 68 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 69, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 70, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 71with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 72, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 73 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 74, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 75 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 76</ol> 77</div><div style="width: 100%; height: 20px"></div></div> 78</div> 79</div> 80</div> 81</div> 82<div id="NTM_res_div"> 83<div id="NTM_msvc"> 84<div id="NTM_multimap_text_find_timing_test_small_s2p_tree"> 85<div id="NTM_assoc"> 86<div id="NHM_Native_and_primary_tree-based_multimap_types_find_timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTM" id="NTM"><img src="multimap_text_find_timing_test_small_s2p_tree_msvc.png" alt="no image" /></a></h6>NTM: NHM Native and primary tree-based multimap types find timing test - <a href="assoc_performance_tests.html#msvc">msvc++</a><p>In the above figure, the names in the legends have the following meaning:</p> 87<ol> 88<li> 89n_mmap- 90<tt>std::multimap</tt></li> 91<li> 92rb_tree_mmap_lu_mtf_set- 93<a href="tree.html"><tt>tree</tt></a> 94 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 95, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 96, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 97 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 98</li> 99<li> 100rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 101<a href="tree.html"><tt>tree</tt></a> 102 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 103, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 104, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 105with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 106, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 107 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 108, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 109 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 110</ol> 111</div><div style="width: 100%; height: 20px"></div></div> 112</div> 113</div> 114</div> 115</div> 116<div id="NTL_res_div"> 117<div id="NTL_local"> 118<div id="NTL_multimap_text_find_timing_test_small_s2p_tree"> 119<div id="NTL_assoc"> 120<div id="NTL_Native_and_primary_tree-based_multimap_types_find_timing_test"><div style = "border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NTL" id= "NTL"><img src="multimap_text_find_timing_test_small_s2p_tree_local.png" alt="no image" /></a></h6>NTL: Native and primary tree-based multimap types find timing test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div> 121</div> 122</div> 123</div> 124</div> 125<div id="NHG_res_div"> 126<div id="NHG_gcc"> 127<div id="NHG_multimap_text_find_timing_test_small_s2p_hash"> 128<div id="NHG_assoc"> 129<div id="NHG_Native_and_primary_hash-based_multimap_types_find_timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NHG" id="NHG"><img src="multimap_text_find_timing_test_small_s2p_hash_gcc.png" alt="no image" /></a></h6>NHG: Native and primary hash-based multimap types find timing test - <a href="assoc_performance_tests.html#gcc">g++</a><p>In the above figure, the names in the legends have the following meaning:</p> 130<ol> 131<li> 132n_hash_mmap- 133<tt>__gnucxx::hash_multimap</tt></li> 134<li> 135cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set- 136<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 137with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 138, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 139 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 140, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 141 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 142 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 143</li> 144<li> 145cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 146<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 147with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 148, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 149 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 150, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 151 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 152with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 153, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 154 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 155, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 156 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 157</ol> 158</div><div style="width: 100%; height: 20px"></div></div> 159</div> 160</div> 161</div> 162</div> 163<div id="NHM_res_div"> 164<div id="NHM_msvc"> 165<div id="NHM_multimap_text_find_timing_test_small_s2p_hash"> 166<div id="NHM_assoc"> 167<div id="NHM_Native_and_primary_hash-based_multimap_types_find_timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NHM" id="NHM"><img src="multimap_text_find_timing_test_small_s2p_hash_msvc.png" alt="no image" /></a></h6>NHM: Native and primary hash-based multimap types find timing test - <a href="assoc_performance_tests.html#msvc">msvc++</a><p>In the above figure, the names in the legends have the following meaning:</p> 168<ol> 169<li> 170n_hash_mmap- 171<tt>stdext::hash_multimap</tt></li> 172<li> 173cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set- 174<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 175with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 176, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 177 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 178, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 179 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 180 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 181</li> 182<li> 183cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 184<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 185with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 186, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 187 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 188, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 189 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 190with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 191, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 192 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 193, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 194 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 195</ol> 196</div><div style="width: 100%; height: 20px"></div></div> 197</div> 198</div> 199</div> 200</div> 201<div id="NHL_res_div"> 202<div id="NHL_local"> 203<div id="NHL_multimap_text_find_timing_test_small_s2p_hash"> 204<div id="NHL_assoc"> 205<div id="NHL__Native_and_primary_hash-based_multimap_types_find_timing_test"><div style = "border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NHL" id= "NHL"><img src="multimap_text_find_timing_test_small_s2p_hash_local.png" alt="no image" /></a></h6>NHL: Native and primary hash-based multimap types find timing test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div> 206</div> 207</div> 208</div> 209</div> 210<h2><a name="observations" id="observations">Observations</a></h2> 211<p>See <a href="assoc_performance_tests.html#msc">Observations::Mapping-Semantics 212 Considerations</a>.</p> 213</div> 214</body> 215</html> 216
