1 /*
2 * BLIB.C
3 *
4 * Simple benchmarking library
5 *
6 * $DragonFly: src/test/sysperf/blib.c,v 1.6 2007/08/21 19:23:46 corecode Exp $
7 */
8
9 #include <sys/types.h>
10 #include <sys/time.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <stdarg.h>
14
15 static __thread struct timeval tv1;
16 static __thread struct timeval tv2;
17 static __thread long long last_us;
18
19 void
start_timing(void)20 start_timing(void)
21 {
22 gettimeofday(&tv1, NULL);
23 }
24
25 int
stop_timing(long long count,const char * ctl,...)26 stop_timing(long long count, const char *ctl, ...)
27 {
28 long long us;
29 va_list va;
30
31 gettimeofday(&tv2, NULL);
32 us = (tv2.tv_usec - tv1.tv_usec) + (tv2.tv_sec - tv1.tv_sec) * 1000000LL;
33 last_us = us;
34 if (ctl == NULL) /* dummy call to pre-cache */
35 return(us > 1000000);
36
37 va_start(va, ctl);
38 vfprintf(stderr, ctl, va);
39 va_end(va);
40
41 fprintf(stderr, " %6.3fs %lld loops, %8.0f loops/sec, %6.3fuS/loop\n",
42 (double)us / 1000000.0,
43 count,
44 (double)count * 1e6 / (double)us,
45 (double)us / (double)count
46 );
47
48 tv1 = tv2;
49
50 return(0);
51 }
52
53 int
stop_timing2(long long count,long long us,const char * ctl,...)54 stop_timing2(long long count, long long us, const char *ctl, ...)
55 {
56 va_list va;
57
58 va_start(va, ctl);
59 vfprintf(stderr, ctl, va);
60 va_end(va);
61
62 fprintf(stderr, " %6.3fs %lld loops = %6.3fnS/loop\n",
63 (double)us / 1000000.0,
64 count,
65 (double)us * 1000.0 / (double)count
66 );
67 return(0);
68 }
69
70 long long
get_timing(void)71 get_timing(void)
72 {
73 return (last_us);
74 }
75
76 void
nop(void)77 nop(void)
78 {
79 }
80