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
173
174
175
176
|
// $Id$
//============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// High_Res_Timer_Test.cpp
//
// = DESCRIPTION
// Simple test of ACE_High_Res_Timer.
//
// = AUTHOR
// David L. Levine <levine@cs.wustl.edu>
//
//============================================================================
#include "test_config.h"
#include "ace/Log_Msg.h"
#include "ace/High_Res_Timer.h"
#include "ace/Sched_Params.h"
#include "ace/Get_Opt.h"
#include "ace/OS_NS_unistd.h"
ACE_RCSID(tests, High_Res_Timer_Test, "High_Res_Timer_Test.cpp,v 4.6 2000/04/23 04:43:58 brunsch Exp")
static
u_int
check (const u_int interval, const u_int measured)
{
const u_int threshold = 25 /* percent */;
const u_int difference =
interval > measured ? interval - measured : measured - interval;
const u_int percentage_difference = difference * 100 / interval;
if (percentage_difference < threshold)
return 0;
else
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("The measured time of %u differs from ")
ACE_TEXT ("the interval of %u by %u percent.\n"),
measured,
interval,
percentage_difference),
1);
}
// Does a sanity check of the microseconds vs nanoseconds. They're supposed
// to represent the same interval.
static u_int
check_micro_nano (ACE_hrtime_t microinterval, ACE_hrtime_t nanointerval)
{
const u_int threshold = 8 /* promille */;
microinterval *= 1000u;
ACE_hrtime_t hr_difference = (microinterval > nanointerval ?
microinterval - nanointerval :
nanointerval - microinterval );
const u_int difference = ACE_HRTIME_CONVERSION (hr_difference);
if (nanointerval == 0)
nanointerval = 1; // Prevent divide-by-zero
const u_int promille_difference = difference * 1000 /
ACE_HRTIME_CONVERSION(nanointerval);
if ((promille_difference < threshold) || (difference < 1500))
return 0;
else
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("The microseconds * 1000 of %u differs from ")
ACE_TEXT ("the nanoseconds of %u by %u promille\n"),
ACE_HRTIME_CONVERSION (microinterval),
ACE_HRTIME_CONVERSION (nanointerval),
promille_difference),
1);
}
static
ACE_Time_Value
time_interval (const ACE_Time_Value &interval,
ACE_hrtime_t& nanoseconds,
ACE_hrtime_t& microseconds)
{
ACE_High_Res_Timer timer;
timer.start ();
ACE_OS::sleep (interval);
timer.stop ();
ACE_Time_Value measured;
timer.elapsed_time (measured);
timer.elapsed_time (nanoseconds);
timer.elapsed_microseconds (microseconds);
return measured;
}
static
u_int
intervals [] = {0, 1, 10, 100, 1000, 10000, 100000, 1000000, 4000000}; /*usec*/
int
run_main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("High_Res_Timer_Test"));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("The ACE_High_Res_Timer scale factor is %u ")
ACE_TEXT ("1/microsecond\n"),
ACE_High_Res_Timer::global_scale_factor ()));
u_int errors = 0;
u_int iterations = 1;
ACE_Get_Opt getopt (argc, argv, ACE_TEXT ("i:"));
for (int c; (c = getopt ()) != -1; )
switch (c)
{
case 'i':
iterations = ACE_OS::atoi (getopt.opt_arg ());
break;
}
// We don't check for errors if the interval is shorter than this
// value because the OS has a finite resolution anyway.
const u_int TIMER_RESOLUTION = 10000;
for (u_int i = 0; i < sizeof intervals / sizeof (u_int); ++i)
{
for (u_int j = 0; j < iterations; ++j)
{
const ACE_Time_Value interval (0, intervals[i]);
ACE_hrtime_t nanoseconds;
ACE_hrtime_t microseconds;
const ACE_Time_Value measured = time_interval (interval,
nanoseconds,
microseconds);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("interval: %u usec, measured: %u usec%s\n"),
interval.sec () * 1000000 + interval.usec (),
measured.sec () * 1000000 + measured.usec (),
intervals[i] <= TIMER_RESOLUTION ?
ACE_TEXT (" (interval and measured may differ)") :
ACE_TEXT ("")));
if (intervals[i] > TIMER_RESOLUTION)
{
errors += check (interval.sec () * 1000000 + interval.usec (),
measured.sec () * 1000000 + measured.usec ());
// Don't check for error for intervals below 10 msec.
}
// Check the ACE_Timer_Value-calculated microseconds against
// the ACE_High_Res_Timer-calculated nanoseconds.
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("ACE_Time_Value usec: %u, ACE_HR nsec: %u\n"),
measured.sec () * 1000000 + measured.usec (),
ACE_HRTIME_CONVERSION (nanoseconds)));
// This gives problems -> should be fixed
errors += check_micro_nano (measured.sec () * 1000000 +
measured.usec (),
nanoseconds);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("ACE_High_Res_Timer usec: %u, nsec: %u\n"),
ACE_HRTIME_CONVERSION (microseconds),
ACE_HRTIME_CONVERSION (nanoseconds)));
// Now check the ACE_High_Res_Timer-calculated values against
// each other.
errors += check_micro_nano (microseconds, nanoseconds);
}
}
ACE_END_TEST;
return errors == 0 ? 0 : 1;
}
|
