1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/* -*- 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_OPTIMIZER_COST_VECTOR_H
#define DRIZZLED_OPTIMIZER_COST_VECTOR_H
namespace drizzled
{
namespace optimizer
{
class CostVector
{
public:
CostVector() :
io_count(0.0),
avg_io_cost(1.0),
cpu_cost(0.0),
mem_cost(0.0),
import_cost(0.0)
{}
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 CostVector* 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;
}
/* accessor methods*/
void setIOCount(double m)
{
io_count= m;
}
double getIOCount() const
{
return io_count;
}
void setAvgIOCost(double m)
{
avg_io_cost= m;
}
double getAvgIOCost() const
{
return avg_io_cost;
}
void setCpuCost(double m)
{
cpu_cost= m;
}
double getCpuCost() const
{
return cpu_cost;
}
void setMemCost(double m)
{
mem_cost= m;
}
double getMemCost() const
{
return mem_cost;
}
void setImportCost(double m)
{
import_cost= m;
}
double getImportCost() const
{
return import_cost;
}
private:
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;
};
} /* namespace optimizer */
} /* namespace drizzled */
#endif /* DRIZZLED_OPTIMIZER_COST_VECTOR_H */
|