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575.1.3
by Monty Taylor
Moved some stuff out of handler.h. |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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* Copyright (C) 2008 Sun Microsystems
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*
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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 as published by
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* the Free Software Foundation; version 2 of the License.
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*
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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 for more details.
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*
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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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*/
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#ifndef DRIZZLED_COST_VECT_H
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#define DRIZZLED_COST_VECT_H
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575.4.7
by Monty Taylor
More header cleanup. |
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#include <stdint.h> |
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575.1.3
by Monty Taylor
Moved some stuff out of handler.h. |
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class COST_VECT |
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{
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public: |
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double io_count; /* number of I/O */ |
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double avg_io_cost; /* cost of an average I/O oper. */ |
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double cpu_cost; /* cost of operations in CPU */ |
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double mem_cost; /* cost of used memory */ |
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double import_cost; /* cost of remote operations */ |
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static const uint32_t IO_COEFF=1; |
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static const uint32_t CPU_COEFF=1; |
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static const uint32_t MEM_COEFF=1; |
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static const uint32_t IMPORT_COEFF=1; |
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COST_VECT() {} // keep gcc happy |
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double total_cost() |
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{
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return IO_COEFF*io_count*avg_io_cost + CPU_COEFF * cpu_cost + |
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MEM_COEFF*mem_cost + IMPORT_COEFF*import_cost; |
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}
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void zero() |
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{
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avg_io_cost= 1.0; |
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io_count= cpu_cost= mem_cost= import_cost= 0.0; |
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}
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void multiply(double m) |
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{
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io_count *= m; |
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cpu_cost *= m; |
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import_cost *= m; |
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/* Don't multiply mem_cost */
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}
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void add(const COST_VECT* cost) |
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{
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double io_count_sum= io_count + cost->io_count; |
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add_io(cost->io_count, cost->avg_io_cost); |
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io_count= io_count_sum; |
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cpu_cost += cost->cpu_cost; |
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}
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void add_io(double add_io_cnt, double add_avg_cost) |
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{
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double io_count_sum= io_count + add_io_cnt; |
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avg_io_cost= (io_count * avg_io_cost + |
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add_io_cnt * add_avg_cost) / io_count_sum; |
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io_count= io_count_sum; |
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}
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};
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void get_sweep_read_cost(Table *table, ha_rows nrows, bool interrupted, |
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COST_VECT *cost); |
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#endif /* DRIZZLED_COST_VECT_H */ |