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 Insert 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 Insert 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 insert-time as a function of 27 the number of values inserted. For <tt>pb_ds</tt>'s containers, 28 it inserts a primary key into the primary associative 29 container, then a secondary key into the secondary associative 30 container. For the native multimaps, it obtains a range using 31 <tt>std::equal_range</tt>, and inserts a value only if it was 32 not contained already.</p> 33<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_insert_timing_small.cc"><tt>multimap_text_insert_timing_test</tt></a> 34 thirty_years_among_the_dead_preproc.txt 400 1 1 6)</p> 35<h2><a name="purpose" id="purpose">Purpose</a></h2> 36<p>The test checks the insert-time scalability of different 37 "multimap" designs (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative 38 Containers::Alternative to Multiple Equivalent Keys</a>).</p> 39<h2><a name="results" id="results">Results</a></h2> 40<p>Figures <a href="#NTG">NTG</a>, <a href="#NTM">NTM</a>, and 41 <a href="#NTL">NTL</a> show the results for "multimaps" which 42 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 43 <a href="assoc_performance_tests.html#local"><u>local</u></a>, 44 respectively; Figures <a href="#NHG"></a>NHG, <a href="#NHM">NHM</a>, and <a href="#NHL">NHL</a> show the results for 45 "multimaps" which use a hash-based container for primary keys, 46 in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>, 47 <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a>, 48 and <a href="assoc_performance_tests.html#local"><u>local</u></a>, 49 respectively.</p> 50<div id="NTG_res_div"> 51<div id="NTG_gcc"> 52<div id="NTG_multimap_text_insert_timing_test_small_s2p_tree"> 53<div id="NTG_assoc"> 54<div id="NTG_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_gcc.png" alt="no image" /></a></h6>NTG: Native and primary tree-based multimap types insert 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> 55<ol> 56<li> 57n_mmap- 58<tt>std::multimap</tt></li> 59<li> 60rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 61<a href="tree.html"><tt>tree</tt></a> 62 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 63, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 64, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 65with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 66, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 67 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 68, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 69 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 70<li> 71rb_tree_mmap_lu_mtf_set- 72<a href="tree.html"><tt>tree</tt></a> 73 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 74, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 75, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 76 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 77</li> 78</ol> 79</div><div style="width: 100%; height: 20px"></div></div> 80</div> 81</div> 82</div> 83</div> 84<div id="NTM_res_div"> 85<div id="NTM_msvc"> 86<div id="NTM_multimap_text_insert_timing_test_small_s2p_tree"> 87<div id="NTM_assoc"> 88<div id="NHM_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_msvc.png" alt="no image" /></a></h6>NTM: NHM Native and primary tree-based multimap types insert 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> 89<ol> 90<li> 91rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 92<a href="tree.html"><tt>tree</tt></a> 93 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 94, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 95, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 96with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 97, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 98 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 99, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 100 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 101<li> 102n_mmap- 103<tt>std::multimap</tt></li> 104<li> 105rb_tree_mmap_lu_mtf_set- 106<a href="tree.html"><tt>tree</tt></a> 107 with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a> 108, and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a> 109, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 110 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 111</li> 112</ol> 113</div><div style="width: 100%; height: 20px"></div></div> 114</div> 115</div> 116</div> 117</div> 118<div id="NTL_res_div"> 119<div id="NTL_local"> 120<div id="NTL_multimap_text_insert_timing_test_small_s2p_tree"> 121<div id="NTL_assoc"> 122<div id="NTL_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_local.png" alt="no image" /></a></h6>NTL: Native and primary tree-based multimap types insert timing test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div> 123</div> 124</div> 125</div> 126</div> 127<div id="NHG_res_div"> 128<div id="NHG_gcc"> 129<div id="NHG_multimap_text_insert_timing_test_small_s2p_hash"> 130<div id="NHG_assoc"> 131<div id="NHG_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_gcc.png" alt="no image" /></a></h6>NHG: Native and primary hash-based multimap types insert 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> 132<ol> 133<li> 134n_hash_mmap- 135<tt>__gnucxx::hash_multimap</tt></li> 136<li> 137cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 138<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 139with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 140, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 141 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 142, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 143 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> 144with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 145, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 146 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 147, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 148 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 149<li> 150cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set- 151<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>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 157 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 158</li> 159</ol> 160</div><div style="width: 100%; height: 20px"></div></div> 161</div> 162</div> 163</div> 164</div> 165<div id="NHM_res_div"> 166<div id="NHM_msvc"> 167<div id="NHM_multimap_text_insert_timing_test_small_s2p_hash"> 168<div id="NHM_assoc"> 169<div id="NHM_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_msvc.png" alt="no image" /></a></h6>NHM: Native and primary hash-based multimap types insert 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> 170<ol> 171<li> 172cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set- 173<a href="cc_hash_table.html"><tt>cc_hash_table</tt></a> 174with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 175, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 176 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 177, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 178 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> 179with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a> 180, and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a> 181 with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a> 182, and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a> 183 with <i>α<sub>min</sub></i> = <i>1/8</i> and <i>α<sub>max</sub></i> = <i>1/2</i></li> 184<li> 185n_hash_mmap- 186<tt>stdext::hash_multimap</tt></li> 187<li> 188cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set- 189<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>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a> 195 with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a> 196</li> 197</ol> 198</div><div style="width: 100%; height: 20px"></div></div> 199</div> 200</div> 201</div> 202</div> 203<div id="NHL_res_div"> 204<div id="NHL_local"> 205<div id="NHL_multimap_text_insert_timing_test_small_s2p_hash"> 206<div id="NHL_assoc"> 207<div id="NHL_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_local.png" alt="no image" /></a></h6>NHL: Native and primary hash-based multimap types insert timing test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div> 208</div> 209</div> 210</div> 211</div> 212<h2><a name="observations" id="observations">Observations</a></h2> 213<p>See <a href="assoc_performance_tests.html#msc">Observations::Mapping-Semantics 214 Considerations</a>.</p> 215</div> 216</body> 217</html> 218
