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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    2. 

  2.     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    3. 

  3. 

  4. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    5. 

  5. <head>
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  6. <meta name="generator" content="HTML Tidy for Linux/x86 (vers 12 April 2005), see www.w3.org" />
    7. 

  7. <title>"Multimap" Text Find Timing Test with Small Average
    8. 

  8.   Secondary-Key to Primary-Key Ratio</title>
    9. 

  9. <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" />
    10. 

  10. </head>
    11. 

  11. <body>
    12. 

  12. <div id="page">
    13. 

  13. <h1>"Multimap" Text Find Timing Test with Small Average
    14. 

  14.     Secondary-Key to Primary-Key Ratio</h1>
    15. 

  15. <h2><a name="description" id="description">Description</a></h2>
    16. 

  16. <p>This test inserts a number of pairs into a container. The
    17. 

  17.     first item of each pair is a string from an arbitrary text
    18. 

  18.     [<a href="references.html#wickland96thirty">wickland96thirty</a>], and
    19. 

  19.     the second is a uniform i.i.d.integer. The container is a
    20. 

  20.     "multimap" - it considers the first member of each pair as a
    21. 

  21.     primary key, and the second member of each pair as a secondary
    22. 

  22.     key (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative
    23. 

  23.     Containers::Alternative to Multiple Equivalent Keys</a>). There
    24. 

  24.     are 400 distinct primary keys, and the ratio of secondary keys
    25. 

  25.     to primary keys ranges from 1 to 5.</p>
    26. 

  26. <p>The test measures the average find-time as a function of the
    27. 

  27.     number of values inserted. For <tt>pb_ds</tt>'s containers, it
    28. 

  28.     finds the secondary key from a container obtained from finding
    29. 

  29.     a primary key. For the native multimaps, it searches a range
    30. 

  30.     obtained using <tt>std::equal_range</tt> on a primary key.</p>
    31. 

  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. 

  32.     thirty_years_among_the_dead_preproc.txt 400 1 1 6)</p>
    33. 

  33. <h2><a name="purpose" id="purpose">Purpose</a></h2>
    34. 

  34. <p>The test checks the find-time scalability of different
    35. 

  35.     "multimap" designs (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative
    36. 

  36.     Containers::Mapping Semantics</a>).</p>
    37. 

  37. <h2><a name="results" id="results">Results</a></h2>
    38. 

  38. <p>Figures <a href="#NTG">NTG</a>, <a href="#NTM">NTM</a>, and
    39. 

  39.     <a href="#NTL">NTL</a> show the results for "multimaps" which
    40. 

  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. 

  41.     <a href="assoc_performance_tests.html#local"><u>local</u></a>,
    42. 

  42.     respectively; Figures <a href="#NHG"></a>NHG, <a href="#NHM">NHM</a>, and <a href="#NHL">NHL</a> show the results for
    43. 

  43.     "multimaps" which use a hash-based container for primary keys,
    44. 

  44.     in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>,
    45. 

  45.     <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a>,
    46. 

  46.     and <a href="assoc_performance_tests.html#local"><u>local</u></a>,
    47. 

  47.     respectively.</p>
    48. 

  48. <div id="NTG_res_div">
    49. 

  49. <div id="NTG_gcc">
    50. 

  50. <div id="NTG_multimap_text_find_timing_test_small_s2p_tree">
    51. 

  51. <div id="NTG_assoc">
    52. 

  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. 

  53. <ol>
    54. 

  54. <li>
    55. 

  55. n_mmap-
    56. 

  56. <tt>std::multimap</tt></li>
    57. 

  57. <li>
    58. 

  58. rb_tree_mmap_lu_mtf_set-
    59. 

  59. <a href="tree.html"><tt>tree</tt></a>
    60. 

  60.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    61. 

  61. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    62. 

  62. , mapping each key to <a href="list_update.html"><tt>list_update</tt></a>
    63. 

  63.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    64. 

  64. </li>
    65. 

  65. <li>
    66. 

  66. rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    67. 

  67. <a href="tree.html"><tt>tree</tt></a>
    68. 

  68.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    69. 

  69. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    70. 

  70. , mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    71. 

  71. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    72. 

  72. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    73. 

  73.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    74. 

  74. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    75. 

  75.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    76. 

  76. </ol>
    77. 

  77. </div><div style="width: 100%; height: 20px"></div></div>
    78. 

  78. </div>
    79. 

  79. </div>
    80. 

  80. </div>
    81. 

  81. </div>
    82. 

  82. <div id="NTM_res_div">
    83. 

  83. <div id="NTM_msvc">
    84. 

  84. <div id="NTM_multimap_text_find_timing_test_small_s2p_tree">
    85. 

  85. <div id="NTM_assoc">
    86. 

  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. 

  87. <ol>
    88. 

  88. <li>
    89. 

  89. n_mmap-
    90. 

  90. <tt>std::multimap</tt></li>
    91. 

  91. <li>
    92. 

  92. rb_tree_mmap_lu_mtf_set-
    93. 

  93. <a href="tree.html"><tt>tree</tt></a>
    94. 

  94.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    95. 

  95. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    96. 

  96. , mapping each key to <a href="list_update.html"><tt>list_update</tt></a>
    97. 

  97.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    98. 

  98. </li>
    99. 

  99. <li>
    100. 

  100. rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    101. 

  101. <a href="tree.html"><tt>tree</tt></a>
    102. 

  102.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    103. 

  103. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    104. 

  104. , mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    105. 

  105. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    106. 

  106. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    107. 

  107.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    108. 

  108. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    109. 

  109.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    110. 

  110. </ol>
    111. 

  111. </div><div style="width: 100%; height: 20px"></div></div>
    112. 

  112. </div>
    113. 

  113. </div>
    114. 

  114. </div>
    115. 

  115. </div>
    116. 

  116. <div id="NTL_res_div">
    117. 

  117. <div id="NTL_local">
    118. 

  118. <div id="NTL_multimap_text_find_timing_test_small_s2p_tree">
    119. 

  119. <div id="NTL_assoc">
    120. 

  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. 

  121. </div>
    122. 

  122. </div>
    123. 

  123. </div>
    124. 

  124. </div>
    125. 

  125. <div id="NHG_res_div">
    126. 

  126. <div id="NHG_gcc">
    127. 

  127. <div id="NHG_multimap_text_find_timing_test_small_s2p_hash">
    128. 

  128. <div id="NHG_assoc">
    129. 

  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. 

  130. <ol>
    131. 

  131. <li>
    132. 

  132. n_hash_mmap-
    133. 

  133. <tt>__gnucxx::hash_multimap</tt></li>
    134. 

  134. <li>
    135. 

  135. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
    136. 

  136. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    137. 

  137. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    138. 

  138. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    139. 

  139.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    140. 

  140. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    141. 

  141.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a>
    142. 

  142.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    143. 

  143. </li>
    144. 

  144. <li>
    145. 

  145. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    146. 

  146. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    147. 

  147. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    148. 

  148. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    149. 

  149.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    150. 

  150. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    151. 

  151.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    152. 

  152. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    153. 

  153. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    154. 

  154.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    155. 

  155. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    156. 

  156.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    157. 

  157. </ol>
    158. 

  158. </div><div style="width: 100%; height: 20px"></div></div>
    159. 

  159. </div>
    160. 

  160. </div>
    161. 

  161. </div>
    162. 

  162. </div>
    163. 

  163. <div id="NHM_res_div">
    164. 

  164. <div id="NHM_msvc">
    165. 

  165. <div id="NHM_multimap_text_find_timing_test_small_s2p_hash">
    166. 

  166. <div id="NHM_assoc">
    167. 

  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. 

  168. <ol>
    169. 

  169. <li>
    170. 

  170. n_hash_mmap-
    171. 

  171. <tt>stdext::hash_multimap</tt></li>
    172. 

  172. <li>
    173. 

  173. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
    174. 

  174. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    175. 

  175. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    176. 

  176. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    177. 

  177.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    178. 

  178. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    179. 

  179.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="list_update.html"><tt>list_update</tt></a>
    180. 

  180.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    181. 

  181. </li>
    182. 

  182. <li>
    183. 

  183. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    184. 

  184. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    185. 

  185. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    186. 

  186. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    187. 

  187.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    188. 

  188. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    189. 

  189.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i>, mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    190. 

  190. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    191. 

  191. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    192. 

  192.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    193. 

  193. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    194. 

  194.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    195. 

  195. </ol>
    196. 

  196. </div><div style="width: 100%; height: 20px"></div></div>
    197. 

  197. </div>
    198. 

  198. </div>
    199. 

  199. </div>
    200. 

  200. </div>
    201. 

  201. <div id="NHL_res_div">
    202. 

  202. <div id="NHL_local">
    203. 

  203. <div id="NHL_multimap_text_find_timing_test_small_s2p_hash">
    204. 

  204. <div id="NHL_assoc">
    205. 

  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. 

  206. </div>
    207. 

  207. </div>
    208. 

  208. </div>
    209. 

  209. </div>
    210. 

  210. <h2><a name="observations" id="observations">Observations</a></h2>
    211. 

  211. <p>See <a href="assoc_performance_tests.html#msc">Observations::Mapping-Semantics
    212. 

  212.     Considerations</a>.</p>
    213. 

  213. </div>
    214. 

  214. </body>
    215. 

  215. </html>
    216. 

  216.