blob: f093ec19fa6f0a09eef0a086d0e7b378de01774c (
plain)
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
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.
*/
#include "benchmark.h"
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <time.h>
static void BM_time_clock_gettime(int iters) {
StartBenchmarkTiming();
timespec t;
for (int i = 0; i < iters; ++i) {
clock_gettime(CLOCK_MONOTONIC, &t);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_time_clock_gettime);
static void BM_time_clock_gettime_syscall(int iters) {
StartBenchmarkTiming();
timespec t;
for (int i = 0; i < iters; ++i) {
syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_time_clock_gettime_syscall);
static void BM_time_gettimeofday(int iters) {
StartBenchmarkTiming();
timeval tv;
for (int i = 0; i < iters; ++i) {
gettimeofday(&tv, NULL);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_time_gettimeofday);
static void BM_time_gettimeofday_syscall(int iters) {
StartBenchmarkTiming();
timeval tv;
for (int i = 0; i < iters; ++i) {
syscall(__NR_gettimeofday, &tv, NULL);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_time_gettimeofday_syscall);
static void BM_time_time(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
time(NULL);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_time_time);
|
