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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLED_COST_VECT_H
#define DRIZZLED_COST_VECT_H
#include <stdint.h>
class COST_VECT
{
public:
double io_count; /* number of I/O */
double avg_io_cost; /* cost of an average I/O oper. */
double cpu_cost; /* cost of operations in CPU */
double mem_cost; /* cost of used memory */
double import_cost; /* cost of remote operations */
static const uint32_t IO_COEFF=1;
static const uint32_t CPU_COEFF=1;
static const uint32_t MEM_COEFF=1;
static const uint32_t IMPORT_COEFF=1;
COST_VECT() {} // keep gcc happy
double total_cost()
{
return IO_COEFF*io_count*avg_io_cost + CPU_COEFF * cpu_cost +
MEM_COEFF*mem_cost + IMPORT_COEFF*import_cost;
}
void zero()
{
avg_io_cost= 1.0;
io_count= cpu_cost= mem_cost= import_cost= 0.0;
}
void multiply(double m)
{
io_count *= m;
cpu_cost *= m;
import_cost *= m;
/* Don't multiply mem_cost */
}
void add(const COST_VECT* cost)
{
double io_count_sum= io_count + cost->io_count;
add_io(cost->io_count, cost->avg_io_cost);
io_count= io_count_sum;
cpu_cost += cost->cpu_cost;
}
void add_io(double add_io_cnt, double add_avg_cost)
{
double io_count_sum= io_count + add_io_cnt;
avg_io_cost= (io_count * avg_io_cost +
add_io_cnt * add_avg_cost) / io_count_sum;
io_count= io_count_sum;
}
};
void get_sweep_read_cost(Table *table, ha_rows nrows, bool interrupted,
COST_VECT *cost);
#endif /* DRIZZLED_COST_VECT_H */
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