libstdc++-v3/doc/html/ext/pb_ds/priority_queue_text_push_pop_timing_test.html

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   7 <title>Priority Queue Text Push Pop Timing Test</title>
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  12 <h1>Priority Queue Text <tt>push</tt> and <tt>pop</tt> Timing
  13     Test</h1>
  14 <h2><a name="description" id="description">Description</a></h2>
  15 <p>This test inserts a number of values with keys from an
  16     arbitrary text ([ <a href="references.html#wickland96thirty">wickland96thirty</a> ]) into
  17     a container using <tt>push</tt> , then removes them using
  18     <tt>pop</tt> . It measures the average time for <tt>push</tt>
  19     as a function of the number of values.</p>
  20 <p>(The test was executed with <a href="../../../../testsuite/performance/ext/pb_ds/priority_queue_text_push_pop_timing.cc"><tt>
  21     priority_queue_text_push_pop_timing_test</tt></a>
  22     thirty_years_among_the_dead_preproc.txt 200 200 2100)</p>
  23 <h2><a name="purpose" id="purpose">Purpose</a></h2>
  24 <p>The test checks the effect of different underlying
  25     data structures (see <a href="pq_design.html#pq_imp">Design::Priority
  26     Queues::Implementations</a>).</p>
  27 <h2><a name="results" id="results">Results</a></h2>
  28 <p>Figures <a href="#NPG">NPG</a>, <a href="#NPM">NPM</a>, and
  29     <a href="#NPL">NPL</a> show the results for the native priority
  30     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
  31     <a href="pq_performance_tests.html#local"><u>local</u></a>,
  32     respectively; Figures <a href="#NBRG">NBRG</a>, <a href="#NBRM">NBRM</a>, and <a href="#NBRL">NBRL</a> show the results
  33     for the native priority queues and <tt>pb_ds</tt>'s pairing
  34     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
  35     <a href="pq_performance_tests.html#local"><u>local</u></a>,
  36     respectively.</p>
  37 <div id="NPG_res_div">
  38 <div id="NPG_gcc">
  39 <div id="NPG_priority_queue_text_push_pop_timing_test">
  40 <div id="NPG_pq">
  41 <div id="NPG_Native_tree_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_gcc.png" alt="no image" /></a></h6>NPG: Native tree and <tt>pb ds</tt> priority queue <tt>push</tt> and <tt>pop</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>
  42 <ol>
  43 <li>
  44 n_pq_vector-
  45 <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
  46 <li>
  47 n_pq_deque-
  48 <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
  49 <li>
  50 thin_heap-
  51 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  52  with <tt>Tag</tt> = <a href="thin_heap_tag.html"><tt>thin_heap_tag</tt></a>
  53 </li>
  54 <li>
  55 rc_binomial_heap-
  56 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  57  with <tt>Tag</tt> = <a href="rc_binomial_heap_tag.html"><tt>rc_binomial_heap_tag</tt></a>
  58 </li>
  59 <li>
  60 binomial_heap-
  61 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  62  with <tt>Tag</tt> = <a href="binomial_heap_tag.html"><tt>binomial_heap_tag</tt></a>
  63 </li>
  64 <li>
  65 binary_heap-
  66 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  67  with <tt>Tag</tt> = <a href="binary_heap_tag.html"><tt>binary_heap_tag</tt></a>
  68 </li>
  69 <li>
  70 pairing_heap-
  71 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  72  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
  73 </li>
  74 </ol>
  75 </div><div style="width: 100%; height: 20px"></div></div>
  76 </div>
  77 </div>
  78 </div>
  79 </div>
  80 <div id="NPM_res_div">
  81 <div id="NPM_msvc">
  82 <div id="NPM_priority_queue_text_push_pop_timing_test">
  83 <div id="NPM_pq">
  84 <div id="NPM_Native_tree_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_msvc.png" alt="no image" /></a></h6>NPM: Native tree and <tt>pb ds</tt> priority queue <tt>push</tt> and <tt>pop</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>
  85 <ol>
  86 <li>
  87 n_pq_deque-
  88 <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
  89 <li>
  90 n_pq_vector-
  91 <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
  92 <li>
  93 thin_heap-
  94 <a href="priority_queue.html"><tt>priority_queue</tt></a>
  95  with <tt>Tag</tt> = <a href="thin_heap_tag.html"><tt>thin_heap_tag</tt></a>
  96 </li>
  97 <li>
  98 rc_binomial_heap-
  99 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 100  with <tt>Tag</tt> = <a href="rc_binomial_heap_tag.html"><tt>rc_binomial_heap_tag</tt></a>
 101 </li>
 102 <li>
 103 binomial_heap-
 104 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 105  with <tt>Tag</tt> = <a href="binomial_heap_tag.html"><tt>binomial_heap_tag</tt></a>
 106 </li>
 107 <li>
 108 pairing_heap-
 109 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 110  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
 111 </li>
 112 <li>
 113 binary_heap-
 114 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 115  with <tt>Tag</tt> = <a href="binary_heap_tag.html"><tt>binary_heap_tag</tt></a>
 116 </li>
 117 </ol>
 118 </div><div style="width: 100%; height: 20px"></div></div>
 119 </div>
 120 </div>
 121 </div>
 122 </div>
 123 <div id="NPL_res_div">
 124 <div id="NPL_local">
 125 <div id="NPL_priority_queue_text_push_pop_timing_test">
 126 <div id="NPL_pq">
 127 <div id="NPL_Native_tree_and__tt_pb_ds_455tt__priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_local.png" alt="no image" /></a></h6>NPL: Native tree and <tt>pb ds</tt> priority queue <tt>push</tt> and <tt>pop</tt> timing test - <a href = "pq_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
 128 </div>
 129 </div>
 130 </div>
 131 </div>
 132 <div id="NBRG_res_div">
 133 <div id="NBRG_gcc">
 134 <div id="NBRG_pairing_priority_queue_text_push_pop_timing_test">
 135 <div id="NBRG_pq">
 136 <div id="NBRG_Native_tree_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_gcc.png" alt="no image" /></a></h6>NBRG: Native tree and <tt>pb ds</tt> pairing priority queue <tt>push</tt> and <tt>pop</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>
 137 <ol>
 138 <li>
 139 n_pq_vector-
 140 <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
 141 <li>
 142 n_pq_deque-
 143 <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
 144 <li>
 145 pairing_heap-
 146 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 147  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
 148 </li>
 149 </ol>
 150 </div><div style="width: 100%; height: 20px"></div></div>
 151 </div>
 152 </div>
 153 </div>
 154 </div>
 155 <div id="NBRM_res_div">
 156 <div id="NBRM_msvc">
 157 <div id="NBRM_pairing_priority_queue_text_push_pop_timing_test">
 158 <div id="NBRM_pq">
 159 <div id="NBRM_Native_tree_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_msvc.png" alt="no image" /></a></h6>NBRM: Native tree and <tt>pb ds</tt> pairing priority queue <tt>push</tt> and <tt>pop</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>
 160 <ol>
 161 <li>
 162 n_pq_deque-
 163 <tt>std::priority_queue</tt> adapting <tt>std::deque</tt></li>
 164 <li>
 165 n_pq_vector-
 166 <tt>std::priority_queue</tt> adapting <tt>std::vector</tt></li>
 167 <li>
 168 pairing_heap-
 169 <a href="priority_queue.html"><tt>priority_queue</tt></a>
 170  with <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>
 171 </li>
 172 </ol>
 173 </div><div style="width: 100%; height: 20px"></div></div>
 174 </div>
 175 </div>
 176 </div>
 177 </div>
 178 <div id="NBRL_res_div">
 179 <div id="NBRL_local">
 180 <div id="NBRL_pairing_priority_queue_text_push_pop_timing_test">
 181 <div id="NBRL_pq">
 182 <div id="NBRL_Native_tree_and__tt_pb_ds_455tt__pairing_priority_queue__tt_push_455tt__and__tt_pop_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_pop_timing_test_local.png" alt="no image" /></a></h6>NBRL: Native tree and <tt>pb ds</tt> pairing priority queue <tt>push</tt> and <tt>pop</tt> timing test - <a href = "pq_performance_tests.html#local">local</a></div><div style = "width: 100%; height: 20px"></div></div>
 183 </div>
 184 </div>
 185 </div>
 186 </div>
 187 <h2><a name="observations" id="observations">Observations</a></h2>
 188 <p>These results are very similar to <a href="priority_queue_text_push_timing_test.html">Priority Queue Text
 189     <tt>push</tt> Timing Test</a>. As stated there, pairing heaps
 190     (<a href="priority_queue.html"><tt>priority_queue</tt></a> with
 191     <tt>Tag</tt> = <a href="pairing_heap_tag.html"><tt>pairing_heap_tag</tt></a>)
 192     are most suited for <tt>push</tt> and <tt>pop</tt> sequences of
 193     non-primitive types such as strings. Observing these two tests,
 194     one can note that a pairing heap outperforms the others in
 195     terms of <tt>push</tt> operations, but equals binary heaps
 196     (<a href="priority_queue.html"><tt>priority_queue</tt></a> with
 197     <tt>Tag</tt> = <a href="binary_heap_tag.html"><tt>binary_heap_tag</tt></a>) if
 198     the number of <tt>push</tt> and <tt>pop</tt> operations is
 199     equal. As the number of <tt>pop</tt> operations is at most
 200     equal to the number of <tt>push</tt> operations, pairing heaps
 201     are better in this case. See <a href="priority_queue_random_int_push_pop_timing_test.html">Priority
 202     Queue Random Integer <tt>push</tt> and <tt>pop</tt> Timing
 203     Test</a> for a case which is different.</p>
 204 <p><a href="pq_performance_tests.html#pq_observations">Priority-Queue
 205     Performance Tests::Observations</a> discusses this further and
 206     summarizes.</p>
 207 </div>
 208 </body>
 209 </html>