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107 lines
3.5 KiB
107 lines
3.5 KiB
3 months ago
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/*
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Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "sql/opt_costmodel.h"
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#include "my_dbug.h"
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#include "sql/handler.h"
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#include "sql/opt_costconstantcache.h" // Cost_constant_cache
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#include "sql/table.h" // TABLE
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extern Cost_constant_cache *cost_constant_cache; // defined in
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// opt_costconstantcache.cc
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Cost_model_server::~Cost_model_server() {
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if (m_cost_constants) {
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if (cost_constant_cache) {
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cost_constant_cache->release_cost_constants(m_cost_constants);
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}
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m_cost_constants = NULL;
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}
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}
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void Cost_model_server::init() {
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if (cost_constant_cache && m_server_cost_constants == NULL) {
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// Get the current set of cost constants
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m_cost_constants = cost_constant_cache->get_cost_constants();
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DBUG_ASSERT(m_cost_constants != NULL);
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// Get the cost constants for server operations
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m_server_cost_constants = m_cost_constants->get_server_cost_constants();
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DBUG_ASSERT(m_server_cost_constants != NULL);
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#if !defined(DBUG_OFF)
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m_initialized = true;
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#endif
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}
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}
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void Cost_model_table::init(const Cost_model_server *cost_model_server,
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const TABLE *table) {
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DBUG_ASSERT(cost_model_server != NULL);
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DBUG_ASSERT(table != NULL);
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m_cost_model_server = cost_model_server;
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m_table = table;
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// Find the cost constant object to be used for this table
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m_se_cost_constants =
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m_cost_model_server->get_cost_constants()->get_se_cost_constants(table);
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DBUG_ASSERT(m_se_cost_constants != NULL);
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#if !defined(DBUG_OFF)
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m_initialized = true;
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#endif
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}
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double Cost_model_table::page_read_cost(double pages) const {
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DBUG_ASSERT(m_initialized);
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DBUG_ASSERT(pages >= 0.0);
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const double in_mem = m_table->file->table_in_memory_estimate();
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const double pages_in_mem = pages * in_mem;
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const double pages_on_disk = pages - pages_in_mem;
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DBUG_ASSERT(pages_on_disk >= 0.0);
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const double cost =
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buffer_block_read_cost(pages_in_mem) + io_block_read_cost(pages_on_disk);
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return cost;
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}
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double Cost_model_table::page_read_cost_index(uint index, double pages) const {
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DBUG_ASSERT(m_initialized);
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DBUG_ASSERT(pages >= 0.0);
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double in_mem = m_table->file->index_in_memory_estimate(index);
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const double pages_in_mem = pages * in_mem;
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const double pages_on_disk = pages - pages_in_mem;
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const double cost =
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buffer_block_read_cost(pages_in_mem) + io_block_read_cost(pages_on_disk);
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return cost;
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}
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