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  6. <meta name="generator" content="HTML Tidy for Linux/x86 (vers 12 April 2005), see www.w3.org" />
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  7. <title>Priority Queue Text Push Timing Test</title>
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  11. <div id="page">
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  12. <h1>Priority Queue Text <tt>push</tt> Timing Test</h1>
    13. 

  13. <h2><a name="description" id="description">Description</a></h2>
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  14. <p>This test inserts a number of values with keys from an
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  15.     arbitrary text ([ <a href="references.html#wickland96thirty">wickland96thirty</a> ]) into
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  16.     a container using <tt>push</tt> . It measures the average time
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  17.     for <tt>push</tt> as a function of the number of values
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  18.     pushed.</p>
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  19. <p>(The test was executed with <a href="http://gcc.gnu.org/viewcvs/*checkout*/trunk/libstdc%2B%2B-v3/testsuite/performance/ext/pb_ds/priority_queue_text_push_timing.cc"><tt>priority_queue_text_push_timing_test</tt></a>
    20. 

  20.     thirty_years_among_the_dead_preproc.txt 200 200 2100)</p>
    21. 

  21. <h2><a name="purpose" id="purpose">Purpose</a></h2>
    22. 

  22. <p>The test checks the effect of different underlying
    23. 

  23.     data structures (see <a href="pq_design.html#pq_imp">Design::Priority
    24. 

  24.     Queues::Implementations</a>).</p>
    25. 

  25. <h2><a name="results" id="results">Results</a></h2>
    26. 

  26. <p>Figures <a href="#NPG">NPG</a>, <a href="#NPM">NPM</a>, and
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  27.     <a href="#NPL">NPL</a> show the results for the native priority
    28. 

  28.     queues and <tt>pb_ds</tt> 's priority queues in <a href="pq_performance_tests.html#gcc"><u>g++</u></a>, <a href="pq_performance_tests.html#msvc"><u>msvc++</u></a>, and
    29. 

  29.     <a href="pq_performance_tests.html#local"><u>local</u></a>,
    30. 

  30.     respectively; Figures <a href="#NBRG">NBRG</a>, <a href="#NBRM">NBRM</a>, and <a href="#NBRL">NBRL</a> shows the
    31. 

  31.     results for the binary-heap based native priority queues and
    32. 

  32.     <tt>pb_ds</tt>'s pairing-heap priority queues in <a href="pq_performance_tests.html#gcc"><u>g++</u></a>, <a href="pq_performance_tests.html#msvc"><u>msvc++</u></a>, and
    33. 

  33.     <a href="pq_performance_tests.html#local"><u>local</u></a>,
    34. 

  34.     respectively</p>
    35. 

  35. <div id="NPG_res_div">
    36. 

  36. <div id="NPG_gcc">
    37. 

  37. <div id="NPG_priority_queue_text_push_timing_test">
    38. 

  38. <div id="NPG_pq">
    39. 

  39. <div id="NPG_Native_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NPG" id="NPG"><img src="priority_queue_text_push_timing_test_gcc.png" alt="no image" /></a></h6>NPG: Native and <tt>pb ds</tt> priority queue <tt>push</tt> timing test - <a href="pq_performance_tests.html#gcc">g++</a><p>In the above figure, the names in the legends have the following meaning:</p>
    40. 

  40. <ol>
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  41. <li>
    42. 

  42. n_pq_vector-
    43. 

  43. <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
    44. 

  44. <li>
    45. 

  45. n_pq_deque-
    46. 

  46. <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
    47. 

  47. <li>
    48. 

  48. binary_heap-
    49. 

  49. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    50. 

  50.  with <tt>Tag</tt> = <a href="binary_heap_tag.html"><tt>binary_heap_tag</tt></a>
    51. 

  51. </li>
    52. 

  52. <li>
    53. 

  53. rc_binomial_heap-
    54. 

  54. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    55. 

  55.  with <tt>Tag</tt> = <a href="rc_binomial_heap_tag.html"><tt>rc_binomial_heap_tag</tt></a>
    56. 

  56. </li>
    57. 

  57. <li>
    58. 

  58. thin_heap-
    59. 

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

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

  61. </li>
    62. 

  62. <li>
    63. 

  63. binomial_heap-
    64. 

  64. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    65. 

  65.  with <tt>Tag</tt> = <a href="binomial_heap_tag.html"><tt>binomial_heap_tag</tt></a>
    66. 

  66. </li>
    67. 

  67. <li>
    68. 

  68. pairing_heap-
    69. 

  69. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    70. 

  70.  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
    71. 

  71. </li>
    72. 

  72. </ol>
    73. 

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

  78. <div id="NPM_res_div">
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  79. <div id="NPM_msvc">
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  80. <div id="NPM_priority_queue_text_push_timing_test">
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  81. <div id="NPM_pq">
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  82. <div id="NPM_Native_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NPM" id="NPM"><img src="priority_queue_text_push_timing_test_msvc.png" alt="no image" /></a></h6>NPM: Native and <tt>pb ds</tt> priority queue <tt>push</tt> timing test - <a href="pq_performance_tests.html#msvc">msvc++</a><p>In the above figure, the names in the legends have the following meaning:</p>
    83. 

  83. <ol>
    84. 

  84. <li>
    85. 

  85. n_pq_deque-
    86. 

  86. <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
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  87. <li>
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  88. rc_binomial_heap-
    89. 

  89. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    90. 

  90.  with <tt>Tag</tt> = <a href="rc_binomial_heap_tag.html"><tt>rc_binomial_heap_tag</tt></a>
    91. 

  91. </li>
    92. 

  92. <li>
    93. 

  93. binary_heap-
    94. 

  94. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    95. 

  95.  with <tt>Tag</tt> = <a href="binary_heap_tag.html"><tt>binary_heap_tag</tt></a>
    96. 

  96. </li>
    97. 

  97. <li>
    98. 

  98. binomial_heap-
    99. 

  99. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    100. 

  100.  with <tt>Tag</tt> = <a href="binomial_heap_tag.html"><tt>binomial_heap_tag</tt></a>
    101. 

  101. </li>
    102. 

  102. <li>
    103. 

  103. n_pq_vector-
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  104. <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
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  105. <li>
    106. 

  106. pairing_heap-
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  107. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    108. 

  108.  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
    109. 

  109. </li>
    110. 

  110. <li>
    111. 

  111. thin_heap-
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  112. <a href="priority_queue.html"><tt>priority_queue</tt></a>
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  113.  with <tt>Tag</tt> = <a href="thin_heap_tag.html"><tt>thin_heap_tag</tt></a>
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  114. </li>
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  115. </ol>
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  116. </div><div style="width: 100%; height: 20px"></div></div>
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  117. </div>
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  118. </div>
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  119. </div>
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  120. </div>
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  121. <div id="NPL_res_div">
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  122. <div id="NPL_local">
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  123. <div id="NPL_priority_queue_text_push_timing_test">
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  124. <div id="NPL_pq">
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  125. <div id="NPL_Native_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__timing_test"><div style = "border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NPL" id= "NPL"><img src="priority_queue_text_push_timing_test_local.png" alt="no image" /></a></h6>NPL: Native and <tt>pb ds</tt> priority queue <tt>push</tt> timing test - <a href = "pq_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
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  126. </div>
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  127. </div>
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  128. </div>
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  129. </div>
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  130. <div id="NBRG_res_div">
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  131. <div id="NBRG_gcc">
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  132. <div id="NBRG_pairing_priority_queue_text_push_timing_test">
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  133. <div id="NBRG_pq">
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  134. <div id="NBRG_Native_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NBRG" id="NBRG"><img src="pairing_priority_queue_text_push_timing_test_gcc.png" alt="no image" /></a></h6>NBRG: Native and <tt>pb ds</tt> pairing priority queue <tt>push</tt> timing test - <a href="pq_performance_tests.html#gcc">g++</a><p>In the above figure, the names in the legends have the following meaning:</p>
    135. 

  135. <ol>
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  136. <li>
    137. 

  137. n_pq_vector-
    138. 

  138. <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
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  139. <li>
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  140. n_pq_deque-
    141. 

  141. <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
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  142. <li>
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  143. thin_heap-
    144. 

  144. <a href="priority_queue.html"><tt>priority_queue</tt></a>
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  145.  with <tt>Tag</tt> = <a href="thin_heap_tag.html"><tt>thin_heap_tag</tt></a>
    146. 

  146. </li>
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  147. <li>
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  148. pairing_heap-
    149. 

  149. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    150. 

  150.  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
    151. 

  151. </li>
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  152. </ol>
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  153. </div><div style="width: 100%; height: 20px"></div></div>
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  154. </div>
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  155. </div>
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  156. </div>
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  157. </div>
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  158. <div id="NBRM_res_div">
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  159. <div id="NBRM_msvc">
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  160. <div id="NBRM_pairing_priority_queue_text_push_timing_test">
    161. 

  161. <div id="NBRM_pq">
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  162. <div id="NBRM_Native_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__timing_test"><div style="border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NBRM" id="NBRM"><img src="pairing_priority_queue_text_push_timing_test_msvc.png" alt="no image" /></a></h6>NBRM: Native and <tt>pb ds</tt> pairing priority queue <tt>push</tt> timing test - <a href="pq_performance_tests.html#msvc">msvc++</a><p>In the above figure, the names in the legends have the following meaning:</p>
    163. 

  163. <ol>
    164. 

  164. <li>
    165. 

  165. n_pq_deque-
    166. 

  166. <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
    167. 

  167. <li>
    168. 

  168. n_pq_vector-
    169. 

  169. <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
    170. 

  170. <li>
    171. 

  171. pairing_heap-
    172. 

  172. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    173. 

  173.  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
    174. 

  174. </li>
    175. 

  175. <li>
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  176. thin_heap-
    177. 

  177. <a href="priority_queue.html"><tt>priority_queue</tt></a>
    178. 

  178.  with <tt>Tag</tt> = <a href="thin_heap_tag.html"><tt>thin_heap_tag</tt></a>
    179. 

  179. </li>
    180. 

  180. </ol>
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  181. </div><div style="width: 100%; height: 20px"></div></div>
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  182. </div>
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  183. </div>
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  184. </div>
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  185. </div>
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  186. <div id="NBRL_res_div">
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  187. <div id="NBRL_local">
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  188. <div id="NBRL_pairing_priority_queue_text_push_timing_test">
    189. 

  189. <div id="NBRL_pq">
    190. 

  190. <div id="NBRL_Native_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__timing_test"><div style = "border-style: dotted; border-width: 1px; border-color: lightgray"><h6 class="c1"><a name="NBRL" id= "NBRL"><img src="pairing_priority_queue_text_push_timing_test_local.png" alt="no image" /></a></h6>NBRL: Native and <tt>pb ds</tt> pairing priority queue <tt>push</tt> timing test - <a href = "pq_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
    191. 

  191. </div>
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  192. </div>
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  193. </div>
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  194. </div>
    195. 

  195. <h2><a name="observations" id="observations">Observations</a></h2>
    196. 

  196. <p>Pairing heaps (<a href="priority_queue.html"><tt>priority_queue</tt></a> with
    197. 

  197.     <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>)
    198. 

  198.     are the most suited for sequences of <tt>push</tt> and
    199. 

  199.     <tt>pop</tt> operations of non-primitive types (<i>e.g.</i>
    200. 

  200. <tt>std::string</tt>s). (see also <a href="priority_queue_text_push_pop_timing_test.html">Priority Queue
    201. 

  201.     Text <tt>push</tt> and <tt>pop</tt> Timing Test</a>.) They are
    202. 

  202.     less constrained than binomial heaps, <i>e.g.</i>, and since
    203. 

  203.     they are node-based, they outperform binary heaps. (See
    204. 

  204.     <a href="priority_queue_random_int_push_timing_test.html">Priority
    205. 

  205.     Queue Random Integer <tt>push</tt> Timing Test</a> for the case
    206. 

  206.     of primitive types.)</p>
    207. 

  207. <p>The STL's priority queues do not seem to perform well in
    208. 

  208.     this case: the <tt>std::vector</tt> implementation needs to
    209. 

  209.     perform a logarithmic sequence of string operations for each
    210. 

  210.     operation, and the deque implementation is possibly hampered by
    211. 

  211.     its need to manipulate a relatively-complex type (deques
    212. 

  212.     support a <i>O(1)</i> <tt>push_front</tt>, even though it is
    213. 

  213.     not used by <tt>std::priority_queue</tt>.)</p>
    214. 

  214. <p><a href="pq_performance_tests.html#pq_observations">Priority-Queue
    215. 

  215.     Performance Tests::Observations</a> discusses this further and
    216. 

  216.     summarizes.</p>
    217. 

  217. </div>
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  218. </body>
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  219. </html>
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