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
|
// @file timer.h
/* Copyright 2010 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "time_support.h"
namespace mongo {
/**
* simple scoped timer
*/
class Timer /*copyable*/ {
public:
Timer() { reset(); }
Timer( unsigned long long startMicros ) { old = startMicros; }
int seconds() const { return (int)(micros() / 1000000); }
int millis() const { return (int)(micros() / 1000); }
int minutes() const { return seconds() / 60; }
/** gets time interval and resets at the same time. this way we can call curTimeMicros
once instead of twice if one wanted millis() and then reset().
@return time in millis
*/
int millisReset() {
unsigned long long now = curTimeMicros64();
int m = (int)((now-old)/1000);
old = now;
return m;
}
// note: dubious that the resolution is as anywhere near as high as ethod name implies!
unsigned long long micros() const {
unsigned long long n = curTimeMicros64();
return n - old;
}
unsigned long long micros(unsigned long long & n) const { // returns cur time in addition to timer result
n = curTimeMicros64();
return n - old;
}
unsigned long long startTime() const { return old; }
void reset() { old = curTimeMicros64(); }
private:
unsigned long long old;
};
#if 1
class DevTimer {
public:
class scoped {
public:
scoped(DevTimer& dt) { }
~scoped() { }
};
DevTimer(string) { }
~DevTimer() { }
};
#elif defined(_WIN32)
class DevTimer {
const string _name;
public:
unsigned long long _ticks;
class scoped {
DevTimer& _dt;
unsigned long long _start;
public:
scoped(DevTimer& dt) : _dt(dt) {
LARGE_INTEGER i;
QueryPerformanceCounter(&i);
_start = i.QuadPart;
}
~scoped() {
LARGE_INTEGER i;
QueryPerformanceCounter(&i);
_dt._ticks += (i.QuadPart - _start);
}
};
DevTimer(string name) : _name(name), _ticks(0) {
}
~DevTimer() {
LARGE_INTEGER freq;
assert( QueryPerformanceFrequency(&freq) );
cout << "devtimer\t" << _name << '\t' << _ticks*1000.0/freq.QuadPart << "ms" << endl;
}
};
#endif
} // namespace mongo
|
