/
timing.h
95 lines (73 loc) · 2.2 KB
/
timing.h
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
// Copyright 2013-2017 Edgar Costa
// See LICENSE file for license details.
// timing.h: header file for timing and profiling routines
#ifndef TIMING_H
#define TIMING_H
#include <cstdio>
#include <sys/resource.h>
static double timevaldiff_in_seconds(timeval start,
timeval end)
{
/* Perform the carry for the later subtraction by updating start. */
if (end.tv_usec < start.tv_usec) {
int nsec = (start.tv_usec - end.tv_usec) / 1000000 + 1;
start.tv_usec -= 1000000 * nsec;
start.tv_sec += nsec;
}
if (end.tv_usec - start.tv_usec > 1000000) {
int nsec = (end.tv_usec - start.tv_usec) / 1000000;
start.tv_usec += 1000000 * nsec;
start.tv_sec -= nsec;
}
return end.tv_sec - start.tv_sec + (end.tv_usec - start.tv_usec)*1e-6;
}
#ifdef __APPLE__
#include <sys/time.h>
typedef struct timeval timestamp_type;
static void get_timestamp(timestamp_type *t)
{
gettimeofday(t, NULL);
}
static double timestamp_diff_in_seconds(timestamp_type start,
timestamp_type end) {
return timevaldiff_in_seconds(start, end);
}
#else
#include <time.h>
typedef struct timespec timestamp_type;
static void get_timestamp(timestamp_type *t)
{
clock_gettime(CLOCK_REALTIME, t);
}
static double timestamp_diff_in_seconds(timestamp_type start, timestamp_type end)
{
struct timespec temp;
if ((end.tv_nsec-start.tv_nsec)<0) {
temp.tv_sec = end.tv_sec-start.tv_sec-1;
temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec;
} else {
temp.tv_sec = end.tv_sec-start.tv_sec;
temp.tv_nsec = end.tv_nsec-start.tv_nsec;
}
return temp.tv_sec + 1e-9*temp.tv_nsec;
}
#endif
inline double get_cpu_time(){
return (double)clock() / CLOCKS_PER_SEC;
}
struct timestamp_pair {
struct rusage usage;
timestamp_type wall_time;
} ;
inline void timestamp_mark(timestamp_pair &pair) {
getrusage(RUSAGE_SELF, &pair.usage);
get_timestamp( &pair.wall_time );
}
inline void timestamp_report(const timestamp_pair &pair) {
timestamp_type wtime2;
get_timestamp(&wtime2);
struct rusage usage;
getrusage(RUSAGE_SELF, &usage);
printf("Time: CPU %.3f s, Wall: %.3f s", timevaldiff_in_seconds(pair.usage.ru_utime, usage.ru_utime), timestamp_diff_in_seconds(pair.wall_time, wtime2) );
}
#endif