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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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  2.     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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  3. 

  4. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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  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>Hash-List "Multimap" Text Memory Use Test with Small
    8. 

  8.   Average 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 Memory Use 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 100 distinct primary keys, and the ratio of secondary keys
    25. 

  25.     to primary keys ranges to about 20.</p>
    26. 

  26. <p>The test measures the memory use as a function of the number
    27. 

  27.     of values inserted.</p>
    28. 

  28. <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_mem_usage_small.cc"><tt>multimap_text_insert_mem_usage_test</tt></a>
    29. 

  29.     thirty_years_among_the_dead_preproc.txt 100 3 4 4)</p>
    30. 

  30. <h2><a name="purpose" id="purpose">Purpose</a></h2>
    31. 

  31. <p>The test checks the memory scalability of different
    32. 

  32.     "multimap" designs (see <a href="motivation.html#assoc_mapping_semantics">Motivation::Associative
    33. 

  33.     Containers::Mapping Semantics</a>).</p>
    34. 

  34. <h2><a name="results" id="results">Results</a></h2>
    35. 

  35. <p>Figures <a href="#NTG">NTG</a>, <a href="#NTM">NTM</a>, and
    36. 

  36.     <a href="#NTL">NTL</a> show the results for "multimaps" which
    37. 

  37.     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
    38. 

  38.     <a href="assoc_performance_tests.html#local"><u>local</u></a>,
    39. 

  39.     respectively; Figures <a href="#NHG"></a>NHG, <a href="#NHM">NHM</a>, and <a href="#NHL">NHL</a> show the results for
    40. 

  40.     "multimaps" which use a hash-based container for primary keys,
    41. 

  41.     in <a href="assoc_performance_tests.html#gcc"><u>g++</u></a>,
    42. 

  42.     <a href="assoc_performance_tests.html#msvc"><u>msvc++</u></a>,
    43. 

  43.     and <a href="assoc_performance_tests.html#local"><u>local</u></a>,
    44. 

  44.     respectively.</p>
    45. 

  45. <div id="NTG_res_div">
    46. 

  46. <div id="NTG_gcc">
    47. 

  47. <div id="NTG_multimap_text_insert_mem_usage_test_small_s2p_tree">
    48. 

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

  49. <div id="NTG_Native_and_primary_tree-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_tree_gcc.png" alt="no image" /></a></h6>NTG: Native and primary tree-based multimap types mem usage 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>
    50. 

  50. <ol>
    51. 

  51. <li>
    52. 

  52. rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    53. 

  53. <a href="tree.html"><tt>tree</tt></a>
    54. 

  54.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    55. 

  55. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    56. 

  56. , mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    57. 

  57. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    58. 

  58. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    59. 

  59.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    60. 

  60. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    61. 

  61.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    62. 

  62. <li>
    63. 

  63. n_mmap-
    64. 

  64. <tt>std::multimap</tt></li>
    65. 

  65. <li>
    66. 

  66. rb_tree_mmap_lu_mtf_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="list_update.html"><tt>list_update</tt></a>
    71. 

  71.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    72. 

  72. </li>
    73. 

  73. </ol>
    74. 

  74. </div><div style="width: 100%; height: 20px"></div></div>
    75. 

  75. </div>
    76. 

  76. </div>
    77. 

  77. </div>
    78. 

  78. </div>
    79. 

  79. <div id="NTM_res_div">
    80. 

  80. <div id="NTM_msvc">
    81. 

  81. <div id="NTM_multimap_text_insert_mem_usage_test_small_s2p_tree">
    82. 

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

  83. <div id="NHM_Native_and_primary_tree-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_tree_msvc.png" alt="no image" /></a></h6>NTM: NHM Native and primary tree-based multimap types mem usage 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>
    84. 

  84. <ol>
    85. 

  85. <li>
    86. 

  86. rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    87. 

  87. <a href="tree.html"><tt>tree</tt></a>
    88. 

  88.  with <tt>Tag</tt> = <a href="rb_tree_tag.html"><tt>rb_tree_tag</tt></a>
    89. 

  89. , and <tt>Node_Update</tt> = <a href="null_tree_node_update.html"><tt>null_tree_node_update</tt></a>
    90. 

  90. , mapping each key to <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    91. 

  91. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    92. 

  92. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    93. 

  93.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    94. 

  94. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    95. 

  95.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    96. 

  96. <li>
    97. 

  97. n_mmap-
    98. 

  98. <tt>std::multimap</tt></li>
    99. 

  99. <li>
    100. 

  100. rb_tree_mmap_lu_mtf_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="list_update.html"><tt>list_update</tt></a>
    105. 

  105.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    106. 

  106. </li>
    107. 

  107. </ol>
    108. 

  108. </div><div style="width: 100%; height: 20px"></div></div>
    109. 

  109. </div>
    110. 

  110. </div>
    111. 

  111. </div>
    112. 

  112. </div>
    113. 

  113. <div id="NTL_res_div">
    114. 

  114. <div id="NTL_local">
    115. 

  115. <div id="NTL_multimap_text_insert_mem_usage_test_small_s2p_tree">
    116. 

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

  117. <div id="NTL_Native_and_primary_tree-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_tree_local.png" alt="no image" /></a></h6>NTL: Native and primary tree-based multimap types mem usage test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
    118. 

  118. </div>
    119. 

  119. </div>
    120. 

  120. </div>
    121. 

  121. </div>
    122. 

  122. <div id="NHG_res_div">
    123. 

  123. <div id="NHG_gcc">
    124. 

  124. <div id="NHG_multimap_text_insert_mem_usage_test_small_s2p_hash">
    125. 

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

  126. <div id="NHG_Native_and_primary_hash-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_hash_gcc.png" alt="no image" /></a></h6>NHG: Native and primary hash-based multimap types mem usage 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>
    127. 

  127. <ol>
    128. 

  128. <li>
    129. 

  129. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    130. 

  130. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    131. 

  131. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    132. 

  132. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    133. 

  133.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    134. 

  134. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    135. 

  135.  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>
    136. 

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

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

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

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

  140.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    141. 

  141. <li>
    142. 

  142. n_hash_mmap-
    143. 

  143. <tt>__gnucxx::hash_multimap</tt></li>
    144. 

  144. <li>
    145. 

  145. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_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="list_update.html"><tt>list_update</tt></a>
    152. 

  152.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    153. 

  153. </li>
    154. 

  154. </ol>
    155. 

  155. </div><div style="width: 100%; height: 20px"></div></div>
    156. 

  156. </div>
    157. 

  157. </div>
    158. 

  158. </div>
    159. 

  159. </div>
    160. 

  160. <div id="NHM_res_div">
    161. 

  161. <div id="NHM_msvc">
    162. 

  162. <div id="NHM_multimap_text_insert_mem_usage_test_small_s2p_hash">
    163. 

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

  164. <div id="NHM_Native_and_primary_hash-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_hash_msvc.png" alt="no image" /></a></h6>NHM: Native and primary hash-based multimap types mem usage 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>
    165. 

  165. <ol>
    166. 

  166. <li>
    167. 

  167. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
    168. 

  168. <a href="cc_hash_table.html"><tt>cc_hash_table</tt></a>
    169. 

  169. with <tt>Comb_Hash_Fn</tt> = <a href="direct_mask_range_hashing.html"><tt>direct_mask_range_hashing</tt></a>
    170. 

  170. , and <tt>Resize_Policy</tt> = <a href="hash_standard_resize_policy.html"><tt>hash_standard_resize_policy</tt></a>
    171. 

  171.  with <tt>Size_Policy</tt> = <a href="hash_exponential_size_policy.html"><tt>hash_exponential_size_policy</tt></a>
    172. 

  172. , and <tt>Trigger_Policy</tt> = <a href="hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger</tt></a>
    173. 

  173.  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>
    174. 

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

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

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

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

  178.  with <i>&alpha;<sub>min</sub></i> = <i>1/8</i> and <i>&alpha;<sub>max</sub></i> = <i>1/2</i></li>
    179. 

  179. <li>
    180. 

  180. n_hash_mmap-
    181. 

  181. <tt>stdext::hash_multimap</tt></li>
    182. 

  182. <li>
    183. 

  183. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_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="list_update.html"><tt>list_update</tt></a>
    190. 

  190.  with <tt>Update_Policy</tt> = <a href="move_to_front_lu_policy.html"><tt>move_to_front_lu_policy</tt></a>
    191. 

  191. </li>
    192. 

  192. </ol>
    193. 

  193. </div><div style="width: 100%; height: 20px"></div></div>
    194. 

  194. </div>
    195. 

  195. </div>
    196. 

  196. </div>
    197. 

  197. </div>
    198. 

  198. <div id="NHL_res_div">
    199. 

  199. <div id="NHL_local">
    200. 

  200. <div id="NHL_multimap_text_insert_mem_usage_test_small_s2p_hash">
    201. 

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

  202. <div id="NHL__Native_and_primary_hash-based_multimap_types_mem_usage_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_mem_usage_test_small_s2p_hash_local.png" alt="no image" /></a></h6>NHL:  Native and primary hash-based multimap types mem usage test - <a href = "assoc_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
    203. 

  203. </div>
    204. 

  204. </div>
    205. 

  205. </div>
    206. 

  206. </div>
    207. 

  207. <h2><a name="observations" id="observations">Observations</a></h2>
    208. 

  208. <p>See <a href="assoc_performance_tests.html#msc">Observations::Mapping-Semantics
    209. 

  209.     Considerations</a>.</p>
    210. 

  210. </div>
    211. 

  211. </body>
    212. 

  212. </html>
    213. 

  213.