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7 <title>"Multimap" Text Find 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" />
13 <h1>"Multimap" Text Find 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 find-time as a function of the
27 number of values inserted. For
<tt>pb_ds
</tt>'s containers, it
28 finds the secondary key from a container obtained from finding
29 a primary key. For the native multimaps, it searches a range
30 obtained using
<tt>std::equal_range
</tt> on a primary key.
</p>
31 <p>(The test was executed with
<a href=
"../../../../testsuite/performance/ext/pb_ds/multimap_text_find_timing.cc"><tt>multimap_text_find_timing_test
</tt></a>
32 thirty_years_among_the_dead_preproc.txt
400 1 1 6)
</p>
33 <h2><a name=
"purpose" id=
"purpose">Purpose
</a></h2>
34 <p>The test checks the find-time scalability of different
35 "multimap" designs (see
<a href=
"motivation.html#assoc_mapping_semantics">Motivation::Associative
36 Containers::Mapping Semantics
</a>).
</p>
37 <h2><a name=
"results" id=
"results">Results
</a></h2>
38 <p>Figures
<a href=
"#NTG">NTG
</a>,
<a href=
"#NTM">NTM
</a>, and
39 <a href=
"#NTL">NTL
</a> show the results for
"multimaps" which
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 <a href=
"assoc_performance_tests.html#local"><u>local
</u></a>,
42 respectively; Figures
<a href=
"#NHG"></a>NHG,
<a href=
"#NHM">NHM
</a>, and
<a href=
"#NHL">NHL
</a> show the results for
43 "multimaps" which use a hash-based container for primary keys,
44 in
<a href=
"assoc_performance_tests.html#gcc"><u>g++
</u></a>,
45 <a href=
"assoc_performance_tests.html#msvc"><u>msvc++
</u></a>,
46 and
<a href=
"assoc_performance_tests.html#local"><u>local
</u></a>,
48 <div id=
"NTG_res_div">
50 <div id=
"NTG_multimap_text_find_timing_test_small_s2p_tree">
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>
56 <tt>std::multimap
</tt></li>
58 rb_tree_mmap_lu_mtf_set-
59 <a href=
"tree.html"><tt>tree
</tt></a>
60 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
61 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
62 , mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
63 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
66 rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
67 <a href=
"tree.html"><tt>tree
</tt></a>
68 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
69 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
70 , mapping each key to
<a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
71 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
72 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
73 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
74 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
75 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
77 </div><div style=
"width: 100%; height: 20px"></div></div>
82 <div id=
"NTM_res_div">
84 <div id=
"NTM_multimap_text_find_timing_test_small_s2p_tree">
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>
90 <tt>std::multimap
</tt></li>
92 rb_tree_mmap_lu_mtf_set-
93 <a href=
"tree.html"><tt>tree
</tt></a>
94 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
95 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
96 , mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
97 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
100 rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
101 <a href=
"tree.html"><tt>tree
</tt></a>
102 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
103 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
104 , mapping each key to
<a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
105 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
106 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
107 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
108 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
109 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
111 </div><div style=
"width: 100%; height: 20px"></div></div>
116 <div id=
"NTL_res_div">
118 <div id=
"NTL_multimap_text_find_timing_test_small_s2p_tree">
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>
125 <div id=
"NHG_res_div">
127 <div id=
"NHG_multimap_text_find_timing_test_small_s2p_hash">
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>
133 <tt>__gnucxx::hash_multimap
</tt></li>
135 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
136 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
137 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
138 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
139 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
140 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
141 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>
142 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
145 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
146 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
147 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
148 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
149 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
150 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
151 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>
152 with
<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></li>
158 </div><div style=
"width: 100%; height: 20px"></div></div>
163 <div id=
"NHM_res_div">
165 <div id=
"NHM_multimap_text_find_timing_test_small_s2p_hash">
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>
171 <tt>stdext::hash_multimap
</tt></li>
173 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
174 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
175 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
176 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
177 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
178 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
179 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>
180 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
183 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
184 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
185 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
186 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
187 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
188 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
189 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>
190 with
<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></li>
196 </div><div style=
"width: 100%; height: 20px"></div></div>
201 <div id=
"NHL_res_div">
203 <div id=
"NHL_multimap_text_find_timing_test_small_s2p_hash">
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>
210 <h2><a name=
"observations" id=
"observations">Observations
</a></h2>
211 <p>See
<a href=
"assoc_performance_tests.html#msc">Observations::Mapping-Semantics
212 Considerations
</a>.
</p>