about summary refs log tree commit diff
path: root/absl/time/time_benchmark.cc
blob: 99e6279984e68738877f909e4977a05d44902045 (plain) (blame)
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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
// Copyright 2018 The Abseil Authors.
// 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
//
//      https://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 "absl/time/time.h"

#if !defined(_WIN32)
#include <sys/time.h>
#endif  // _WIN32
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <cstring>
#include <ctime>
#include <memory>
#include <string>

#include "absl/time/clock.h"
#include "absl/time/internal/test_util.h"
#include "benchmark/benchmark.h"

namespace {

//
// Addition/Subtraction of a duration
//

void BM_Time_Arithmetic(benchmark::State& state) {
  const absl::Duration nano = absl::Nanoseconds(1);
  const absl::Duration sec = absl::Seconds(1);
  absl::Time t = absl::UnixEpoch();
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(t += nano);
    benchmark::DoNotOptimize(t -= sec);
  }
}
BENCHMARK(BM_Time_Arithmetic);

//
// Time difference
//

void BM_Time_Difference(benchmark::State& state) {
  absl::Time start = absl::Now();
  absl::Time end = start + absl::Nanoseconds(1);
  absl::Duration diff;
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(diff += end - start);
  }
}
BENCHMARK(BM_Time_Difference);

//
// ToDateTime
//
// In each "ToDateTime" benchmark we switch between two instants
// separated by at least one transition in order to defeat any
// internal caching of previous results (e.g., see local_time_hint_).
//
// The "UTC" variants use UTC instead of the Google/local time zone.
//

void BM_Time_ToDateTime_Absl(benchmark::State& state) {
  const absl::TimeZone tz =
      absl::time_internal::LoadTimeZone("America/Los_Angeles");
  absl::Time t = absl::FromUnixSeconds(1384569027);
  absl::Time t2 = absl::FromUnixSeconds(1418962578);
  while (state.KeepRunning()) {
    std::swap(t, t2);
    t += absl::Seconds(1);
    benchmark::DoNotOptimize(t.In(tz));
  }
}
BENCHMARK(BM_Time_ToDateTime_Absl);

void BM_Time_ToDateTime_Libc(benchmark::State& state) {
  // No timezone support, so just use localtime.
  time_t t = 1384569027;
  time_t t2 = 1418962578;
  while (state.KeepRunning()) {
    std::swap(t, t2);
    t += 1;
    struct tm tm;
#if !defined(_WIN32)
    benchmark::DoNotOptimize(localtime_r(&t, &tm));
#else   // _WIN32
    benchmark::DoNotOptimize(localtime_s(&tm, &t));
#endif  // _WIN32
  }
}
BENCHMARK(BM_Time_ToDateTime_Libc);

void BM_Time_ToDateTimeUTC_Absl(benchmark::State& state) {
  const absl::TimeZone tz = absl::UTCTimeZone();
  absl::Time t = absl::FromUnixSeconds(1384569027);
  while (state.KeepRunning()) {
    t += absl::Seconds(1);
    benchmark::DoNotOptimize(t.In(tz));
  }
}
BENCHMARK(BM_Time_ToDateTimeUTC_Absl);

void BM_Time_ToDateTimeUTC_Libc(benchmark::State& state) {
  time_t t = 1384569027;
  while (state.KeepRunning()) {
    t += 1;
    struct tm tm;
#if !defined(_WIN32)
    benchmark::DoNotOptimize(gmtime_r(&t, &tm));
#else   // _WIN32
    benchmark::DoNotOptimize(gmtime_s(&tm, &t));
#endif  // _WIN32
  }
}
BENCHMARK(BM_Time_ToDateTimeUTC_Libc);

//
// FromUnixMicros
//

void BM_Time_FromUnixMicros(benchmark::State& state) {
  int i = 0;
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(absl::FromUnixMicros(i));
    ++i;
  }
}
BENCHMARK(BM_Time_FromUnixMicros);

void BM_Time_ToUnixNanos(benchmark::State& state) {
  const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(ToUnixNanos(t));
  }
}
BENCHMARK(BM_Time_ToUnixNanos);

void BM_Time_ToUnixMicros(benchmark::State& state) {
  const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(ToUnixMicros(t));
  }
}
BENCHMARK(BM_Time_ToUnixMicros);

void BM_Time_ToUnixMillis(benchmark::State& state) {
  const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(ToUnixMillis(t));
  }
}
BENCHMARK(BM_Time_ToUnixMillis);

void BM_Time_ToUnixSeconds(benchmark::State& state) {
  const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(absl::ToUnixSeconds(t));
  }
}
BENCHMARK(BM_Time_ToUnixSeconds);

//
// FromCivil
//
// In each "FromCivil" benchmark we switch between two YMDhms values
// separated by at least one transition in order to defeat any internal
// caching of previous results (e.g., see time_local_hint_).
//
// The "UTC" variants use UTC instead of the Google/local time zone.
// The "Day0" variants require normalization of the day of month.
//

void BM_Time_FromCivil_Absl(benchmark::State& state) {
  const absl::TimeZone tz =
      absl::time_internal::LoadTimeZone("America/Los_Angeles");
  int i = 0;
  while (state.KeepRunning()) {
    if ((i & 1) == 0) {
      absl::FromCivil(absl::CivilSecond(2014, 12, 18, 20, 16, 18), tz);
    } else {
      absl::FromCivil(absl::CivilSecond(2013, 11, 15, 18, 30, 27), tz);
    }
    ++i;
  }
}
BENCHMARK(BM_Time_FromCivil_Absl);

void BM_Time_FromCivil_Libc(benchmark::State& state) {
  // No timezone support, so just use localtime.
  int i = 0;
  while (state.KeepRunning()) {
    struct tm tm;
    if ((i & 1) == 0) {
      tm.tm_year = 2014 - 1900;
      tm.tm_mon = 12 - 1;
      tm.tm_mday = 18;
      tm.tm_hour = 20;
      tm.tm_min = 16;
      tm.tm_sec = 18;
    } else {
      tm.tm_year = 2013 - 1900;
      tm.tm_mon = 11 - 1;
      tm.tm_mday = 15;
      tm.tm_hour = 18;
      tm.tm_min = 30;
      tm.tm_sec = 27;
    }
    tm.tm_isdst = -1;
    mktime(&tm);
    ++i;
  }
}
BENCHMARK(BM_Time_FromCivil_Libc);

void BM_Time_FromCivilUTC_Absl(benchmark::State& state) {
  const absl::TimeZone tz = absl::UTCTimeZone();
  while (state.KeepRunning()) {
    absl::FromCivil(absl::CivilSecond(2014, 12, 18, 20, 16, 18), tz);
  }
}
BENCHMARK(BM_Time_FromCivilUTC_Absl);

void BM_Time_FromCivilDay0_Absl(benchmark::State& state) {
  const absl::TimeZone tz =
      absl::time_internal::LoadTimeZone("America/Los_Angeles");
  int i = 0;
  while (state.KeepRunning()) {
    if ((i & 1) == 0) {
      absl::FromCivil(absl::CivilSecond(2014, 12, 0, 20, 16, 18), tz);
    } else {
      absl::FromCivil(absl::CivilSecond(2013, 11, 0, 18, 30, 27), tz);
    }
    ++i;
  }
}
BENCHMARK(BM_Time_FromCivilDay0_Absl);

void BM_Time_FromCivilDay0_Libc(benchmark::State& state) {
  // No timezone support, so just use localtime.
  int i = 0;
  while (state.KeepRunning()) {
    struct tm tm;
    if ((i & 1) == 0) {
      tm.tm_year = 2014 - 1900;
      tm.tm_mon = 12 - 1;
      tm.tm_mday = 0;
      tm.tm_hour = 20;
      tm.tm_min = 16;
      tm.tm_sec = 18;
    } else {
      tm.tm_year = 2013 - 1900;
      tm.tm_mon = 11 - 1;
      tm.tm_mday = 0;
      tm.tm_hour = 18;
      tm.tm_min = 30;
      tm.tm_sec = 27;
    }
    tm.tm_isdst = -1;
    mktime(&tm);
    ++i;
  }
}
BENCHMARK(BM_Time_FromCivilDay0_Libc);

//
// To/FromTimespec
//

void BM_Time_ToTimespec(benchmark::State& state) {
  absl::Time now = absl::Now();
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(absl::ToTimespec(now));
  }
}
BENCHMARK(BM_Time_ToTimespec);

void BM_Time_FromTimespec(benchmark::State& state) {
  timespec ts = absl::ToTimespec(absl::Now());
  while (state.KeepRunning()) {
    if (++ts.tv_nsec == 1000 * 1000 * 1000) {
      ++ts.tv_sec;
      ts.tv_nsec = 0;
    }
    benchmark::DoNotOptimize(absl::TimeFromTimespec(ts));
  }
}
BENCHMARK(BM_Time_FromTimespec);

//
// Comparison with InfiniteFuture/Past
//

void BM_Time_InfiniteFuture(benchmark::State& state) {
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(absl::InfiniteFuture());
  }
}
BENCHMARK(BM_Time_InfiniteFuture);

void BM_Time_InfinitePast(benchmark::State& state) {
  while (state.KeepRunning()) {
    benchmark::DoNotOptimize(absl::InfinitePast());
  }
}
BENCHMARK(BM_Time_InfinitePast);

}  // namespace