1 /*
2 Copyright (c) 2014, 2021, Oracle and/or its affiliates.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License, version 2.0,
6 as published by the Free Software Foundation.
7
8 This program is also distributed with certain software (including
9 but not limited to OpenSSL) that is licensed under separate terms,
10 as designated in a particular file or component or in included license
11 documentation. The authors of MySQL hereby grant you an additional
12 permission to link the program and your derivative works with the
13 separately licensed software that they have included with MySQL.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software Foundation,
22 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
23
24 // First include (the generated) my_config.h, to get correct platform defines.
25 #include "my_config.h"
26 #include "opt_costmodel.h"
27 #include "opt_costconstantcache.h" // Cost_constant_cache
28 #include "table.h" // TABLE
29
30 extern Cost_constant_cache *cost_constant_cache;// defined in
31 // opt_costconstantcache.cc
32
33
~Cost_model_server()34 Cost_model_server::~Cost_model_server()
35 {
36 if (m_cost_constants)
37 {
38 cost_constant_cache->release_cost_constants(m_cost_constants);
39 m_cost_constants= NULL;
40 }
41 }
42
43
init()44 void Cost_model_server::init()
45 {
46 if (m_server_cost_constants == NULL)
47 {
48 // Get the current set of cost constants
49 m_cost_constants= cost_constant_cache->get_cost_constants();
50 assert(m_cost_constants != NULL);
51
52 // Get the cost constants for server operations
53 m_server_cost_constants= m_cost_constants->get_server_cost_constants();
54 assert(m_server_cost_constants != NULL);
55
56 #if !defined(NDEBUG)
57 m_initialized= true;
58 #endif
59 }
60 }
61
62
init(const Cost_model_server * cost_model_server,const TABLE * table)63 void Cost_model_table::init(const Cost_model_server *cost_model_server,
64 const TABLE *table)
65 {
66 assert(cost_model_server != NULL);
67 assert(table != NULL);
68
69 m_cost_model_server= cost_model_server;
70 m_table= table;
71
72 // Find the cost constant object to be used for this table
73 m_se_cost_constants=
74 m_cost_model_server->get_cost_constants()->get_se_cost_constants(table);
75 assert(m_se_cost_constants != NULL);
76
77 #if !defined(NDEBUG)
78 m_initialized= true;
79 #endif
80 }
81
82
page_read_cost(double pages) const83 double Cost_model_table::page_read_cost(double pages) const
84 {
85 assert(m_initialized);
86 assert(pages >= 0.0);
87
88 const double in_mem= m_table->file->table_in_memory_estimate();
89
90 const double pages_in_mem= pages * in_mem;
91 const double pages_on_disk= pages - pages_in_mem;
92 assert(pages_on_disk >= 0.0);
93
94 const double cost= buffer_block_read_cost(pages_in_mem) +
95 io_block_read_cost(pages_on_disk);
96
97 return cost;
98 }
99
100
page_read_cost_index(uint index,double pages) const101 double Cost_model_table::page_read_cost_index(uint index, double pages) const
102 {
103 assert(m_initialized);
104 assert(pages >= 0.0);
105
106 double in_mem= m_table->file->index_in_memory_estimate(index);
107
108 const double pages_in_mem= pages * in_mem;
109 const double pages_on_disk= pages - pages_in_mem;
110
111 const double cost= buffer_block_read_cost(pages_in_mem) +
112 io_block_read_cost(pages_on_disk);
113
114 return cost;
115 }
116