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7 <title>"Multimap" Text Insert 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 Insert 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 insert-time as a function of
27 the number of values inserted. For
<tt>pb_ds
</tt>'s containers,
28 it inserts a primary key into the primary associative
29 container, then a secondary key into the secondary associative
30 container. For the native multimaps, it obtains a range using
31 <tt>std::equal_range
</tt>, and inserts a value only if it was
32 not contained already.
</p>
33 <p>(The test was executed with
<a href=
"../../../../testsuite/performance/ext/pb_ds/multimap_text_insert_timing_small.cc"><tt>multimap_text_insert_timing_test
</tt></a>
34 thirty_years_among_the_dead_preproc.txt
400 1 1 6)
</p>
35 <h2><a name=
"purpose" id=
"purpose">Purpose
</a></h2>
36 <p>The test checks the insert-time scalability of different
37 "multimap" designs (see
<a href=
"motivation.html#assoc_mapping_semantics">Motivation::Associative
38 Containers::Alternative to Multiple Equivalent Keys
</a>).
</p>
39 <h2><a name=
"results" id=
"results">Results
</a></h2>
40 <p>Figures
<a href=
"#NTG">NTG
</a>,
<a href=
"#NTM">NTM
</a>, and
41 <a href=
"#NTL">NTL
</a> show the results for
"multimaps" which
42 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
43 <a href=
"assoc_performance_tests.html#local"><u>local
</u></a>,
44 respectively; Figures
<a href=
"#NHG"></a>NHG,
<a href=
"#NHM">NHM
</a>, and
<a href=
"#NHL">NHL
</a> show the results for
45 "multimaps" which use a hash-based container for primary keys,
46 in
<a href=
"assoc_performance_tests.html#gcc"><u>g++
</u></a>,
47 <a href=
"assoc_performance_tests.html#msvc"><u>msvc++
</u></a>,
48 and
<a href=
"assoc_performance_tests.html#local"><u>local
</u></a>,
50 <div id=
"NTG_res_div">
52 <div id=
"NTG_multimap_text_insert_timing_test_small_s2p_tree">
54 <div id=
"NTG_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_gcc.png" alt=
"no image" /></a></h6>NTG: Native and primary tree-based multimap types insert 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>
58 <tt>std::multimap
</tt></li>
60 rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
61 <a href=
"tree.html"><tt>tree
</tt></a>
62 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
63 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
64 , mapping each key to
<a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
65 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
66 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
67 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
68 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
69 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
71 rb_tree_mmap_lu_mtf_set-
72 <a href=
"tree.html"><tt>tree
</tt></a>
73 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
74 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
75 , mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
76 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
79 </div><div style=
"width: 100%; height: 20px"></div></div>
84 <div id=
"NTM_res_div">
86 <div id=
"NTM_multimap_text_insert_timing_test_small_s2p_tree">
88 <div id=
"NHM_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_msvc.png" alt=
"no image" /></a></h6>NTM: NHM Native and primary tree-based multimap types insert 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>
91 rb_tree_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
92 <a href=
"tree.html"><tt>tree
</tt></a>
93 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
94 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
95 , mapping each key to
<a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
96 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
97 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
98 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
99 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
100 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
103 <tt>std::multimap
</tt></li>
105 rb_tree_mmap_lu_mtf_set-
106 <a href=
"tree.html"><tt>tree
</tt></a>
107 with
<tt>Tag
</tt> =
<a href=
"rb_tree_tag.html"><tt>rb_tree_tag
</tt></a>
108 , and
<tt>Node_Update
</tt> =
<a href=
"null_tree_node_update.html"><tt>null_tree_node_update
</tt></a>
109 , mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
110 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
113 </div><div style=
"width: 100%; height: 20px"></div></div>
118 <div id=
"NTL_res_div">
120 <div id=
"NTL_multimap_text_insert_timing_test_small_s2p_tree">
122 <div id=
"NTL_Native_and_primary_tree-based_multimap_types_insert_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_insert_timing_test_small_s2p_tree_local.png" alt=
"no image" /></a></h6>NTL: Native and primary tree-based multimap types insert timing test -
<a href =
"assoc_performance_tests.html#local">local
</a></div><div style =
"width: 100%; height: 20px"></div></div>
127 <div id=
"NHG_res_div">
129 <div id=
"NHG_multimap_text_insert_timing_test_small_s2p_hash">
131 <div id=
"NHG_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_gcc.png" alt=
"no image" /></a></h6>NHG: Native and primary hash-based multimap types insert 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>
135 <tt>__gnucxx::hash_multimap
</tt></li>
137 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
138 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
139 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
140 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
141 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
142 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
143 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>
144 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
145 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
146 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
147 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
148 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
150 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
151 <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>, mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
157 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
160 </div><div style=
"width: 100%; height: 20px"></div></div>
165 <div id=
"NHM_res_div">
167 <div id=
"NHM_multimap_text_insert_timing_test_small_s2p_hash">
169 <div id=
"NHM_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_msvc.png" alt=
"no image" /></a></h6>NHM: Native and primary hash-based multimap types insert 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>
172 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_set-
173 <a href=
"cc_hash_table.html"><tt>cc_hash_table
</tt></a>
174 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
175 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
176 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
177 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
178 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>
179 with
<tt>Comb_Hash_Fn
</tt> =
<a href=
"direct_mask_range_hashing.html"><tt>direct_mask_range_hashing
</tt></a>
180 , and
<tt>Resize_Policy
</tt> =
<a href=
"hash_standard_resize_policy.html"><tt>hash_standard_resize_policy
</tt></a>
181 with
<tt>Size_Policy
</tt> =
<a href=
"hash_exponential_size_policy.html"><tt>hash_exponential_size_policy
</tt></a>
182 , and
<tt>Trigger_Policy
</tt> =
<a href=
"hash_load_check_resize_trigger.html"><tt>hash_load_check_resize_trigger
</tt></a>
183 with
<i>α<sub>min
</sub></i> =
<i>1/
8</i> and
<i>α<sub>max
</sub></i> =
<i>1/
2</i></li>
186 <tt>stdext::hash_multimap
</tt></li>
188 cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_mmap_lu_mtf_set-
189 <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>, mapping each key to
<a href=
"list_update.html"><tt>list_update
</tt></a>
195 with
<tt>Update_Policy
</tt> =
<a href=
"move_to_front_lu_policy.html"><tt>move_to_front_lu_policy
</tt></a>
198 </div><div style=
"width: 100%; height: 20px"></div></div>
203 <div id=
"NHL_res_div">
205 <div id=
"NHL_multimap_text_insert_timing_test_small_s2p_hash">
207 <div id=
"NHL_Native_and_primary_hash-based_multimap_types_insert_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_insert_timing_test_small_s2p_hash_local.png" alt=
"no image" /></a></h6>NHL: Native and primary hash-based multimap types insert timing test -
<a href =
"assoc_performance_tests.html#local">local
</a></div><div style =
"width: 100%; height: 20px"></div></div>
212 <h2><a name=
"observations" id=
"observations">Observations
</a></h2>
213 <p>See
<a href=
"assoc_performance_tests.html#msc">Observations::Mapping-Semantics
214 Considerations
</a>.
</p>