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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*=========================================================================
Program: Visualization Toolkit
Module: TestFastNumericConversion.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME Test of vtkFastNumericConversion.
// .SECTION Description
// Tests performance of the vtkFastNumericConversion methods.
#include "vtkFastNumericConversion.h"
#include "vtkTimerLog.h"
int TestFastNumericConversion(int,char *[])
{
double bare_time;
double cast_time;
double convert_time;
double quickfloor_time;
double safefloor_time;
double round_time;
vtkFastNumericConversion* fnc = vtkFastNumericConversion::New();
const int inner_count = 10000;
const int outer_count = 10000;
double *dval = new double[inner_count];
int *ival = new int[inner_count];
int *frac = new int[inner_count];
int i,o;
vtkTimerLog *timer = vtkTimerLog::New();
for (i=0; i<inner_count; i++)
{
dval[i] = i;
ival[i] = 0;
}
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
// Pure bit copy
ival[i] = *reinterpret_cast<int *>(&dval[i]);
}
}
timer->StopTimer();
bare_time = timer->GetElapsedTime();
// Compute cast time
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
ival[i] = static_cast<int>(dval[i]);
}
}
timer->StopTimer();
cast_time = timer->GetElapsedTime();
// Compute convert time
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
ival[i] =fnc->ConvertFixedPoint(dval[i], frac[i]);
}
}
timer->StopTimer();
convert_time = timer->GetElapsedTime();
// Compute quickfloor time
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
ival[i] = vtkFastNumericConversion::QuickFloor(dval[i]);
}
}
timer->StopTimer();
quickfloor_time = timer->GetElapsedTime();
// Compute safefloor time
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
ival[i] = vtkFastNumericConversion::SafeFloor(dval[i]);
}
}
timer->StopTimer();
safefloor_time = timer->GetElapsedTime();
// Compute round time
timer->StartTimer();
for (o=0; o<outer_count; o++)
{
for (i=0; i<inner_count; i++)
{
ival[i] = vtkFastNumericConversion::Round(dval[i]);
}
}
timer->StopTimer();
round_time = timer->GetElapsedTime();
delete [] dval;
delete [] ival;
delete [] frac;
timer->Delete();
fnc->Delete();
cout << "Bare time from last PerformanceTest() call: " << bare_time << endl;
cout << "Cast time from last PerformanceTest() call: " << cast_time << endl;
cout << "ConvertFixedPoint time from last PerformanceTest() call: " << convert_time << endl;
cout << "QuickFloor time from last PerformanceTest() call: " << quickfloor_time << endl;
cout << "SafeFloor time from last PerformanceTest() call: " << safefloor_time << endl;
cout << "Round time from last PerformanceTest() call: " << round_time << endl;
if (bare_time != 0.0)
{
// Don't do this if we haven't run the tests yet.
if (quickfloor_time-bare_time > 0.0)
{
cout << "Speedup ratio from cast to quickfloor is: " <<
(cast_time-bare_time)/(quickfloor_time-bare_time) << endl;
}
else
{
cout << "quickfloor_time <= bare_time, cannot calculate speedup ratio" << endl;
}
if (safefloor_time-bare_time > 0.0)
{
cout << "Speedup ratio from cast to safefloor is: " <<
(cast_time-bare_time)/(safefloor_time-bare_time) << endl;
}
else
{
cout <<"safefloor_time <= bare_time, cannot calculate speedup ratio" << endl;
}
if (round_time-bare_time > 0.0)
{
cout << "Speedup ratio from cast to round is: " <<
(cast_time-bare_time)/(round_time-bare_time) << endl;
}
else
{
cout << "round_time <= bare_time, cannot calculate speedup ratio" << endl;
}
}
return 0;
}
|
