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
|
/* The default number of cycles per test */
#define BENCH_LOOPS (100000)
#include <sys/time.h>
typedef struct {
int i; /* loop counter */
int n; /* loop maximum */
int divisor; /* operations per cycle */
struct timeval start; /* start time */
struct timeval end; /* end time */
char *name; /* benchmark title */
char *doc; /* benchmark description */
char *units; /* measurement units information */
} bench_t;
#define bench_now(tvp) \
gettimeofday((tvp),0)
/*
* Repeat the body of the loop 'max' times, with a few extra 'warm up'
* cycles to negate cache effects.
*/
#define bench_amortize(b, max) \
for ((b)->i = -64, \
(b)->n = (max); \
(b)->i < (b)->n; \
(b)->i ++, \
((b)->i == 0 ? bench_now(&(b)->start) : \
((b)->i == (b)->n ? bench_now(&(b)->end) \
:0))\
)
#define bench_init(b, nm, dc, un) do { \
(b)->name = (nm); \
(b)->doc = (dc); \
(b)->units = (un); \
timerclear(&(b)->start); \
timerclear(&(b)->end); \
(b)->n = (b)->i = 0; \
(b)->divisor = 1; \
} while (0)
#define bench_header(b) \
printf("----------------------------------------------------\n" \
"Name:\t%s\nDesc:%s\n", (b)->name, (b)->doc)
#define bench_report(b) do { \
bench_t overhead; \
struct timeval oh_elapsed; \
struct timeval elapsed; \
struct timeval normal; \
double average; \
\
/* compute the loop overhead */ \
bench_amortize(&overhead, (b)->n) { /* nothing */ } \
\
/* compute the test time */ \
timersub(&(b)->end, &(b)->start, &elapsed); \
timersub(&overhead.end, &overhead.start, &oh_elapsed); \
timersub(&elapsed, &oh_elapsed, &normal); \
\
average = ((double)normal.tv_sec * 1000000.0 + \
normal.tv_usec) / (double)((b)->divisor) / \
(double)((b)->n); \
\
printf("Time: %f usec %s\n", average, (b)->units); \
} while (0)
|
