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snix/absl/time/time_benchmark.cc
Abseil Team 92020a042c - abacaab4b11a69dd4db627bd183571d7cabb8def Refinement to previous time.h edit (in this same github p... by Greg Falcon <gfalcon@google.com> 
- 64db19b773134c6c8004e3b23c9ca892efbf8bae Move SpinLock's adaptive spin count computation from a st... by Derek Mauro <dmauro@google.com>
  - 6f9533fb44a52485a7c2bbb9b4efc7bf8d6c359a Import of CCTZ from GitHub. by Abseil Team <absl-team@google.com>
  - a211d7255c986e8dd4ceada362c0d054a6a1969a Cleanup exception flags by Abseil Team <absl-team@google.com>
  - babdb29c590126fe9bba5229fe91034b5b5c358a Release time benchmarks. by Alex Strelnikov <strel@google.com>
  - 5803b32a3ff123d1fb57a0c471d199c818357c9f Release memutil microbenchmarks. by Alex Strelnikov <strel@google.com>
  - 5357d4890d30e80c53beb05af32500fb20e9402b Add parens around expansion of ABSL_PREDICT_{FALSE,TRUE} ... by Abseil Team <absl-team@google.com>
  - 32023f61a239a5f6b1c59e577bfe81b179bbcd2d Reformat build rule tag. by Alex Strelnikov <strel@google.com>
  - 833758ecf2b0cf7a42bbd50b5b127e416425c168 Release uint128 microbenchmarks. by Alex Strelnikov <strel@google.com>
  - c115a9bca1f944b90fdc78a56b2de176466b124f Disambiguate bitwise-not of size_type by Abseil Team <absl-team@google.com>
  - f6905f5b5f6e425792de646edafde440548d9346 Updates ConstructorTracker and TrackedObjects with 1) a m... by Abseil Team <absl-team@google.com>
  - 147c553bdd5d2db20a38f75c4d1ef973d6c709c5 Changes the absl::Duration factory functions to disallow ... by Greg Miller <jgm@google.com>
  - dba2b96d11b5264546b283ba452f2de1303b0f07 White space fix by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: abacaab4b11a69dd4db627bd183571d7cabb8def
Change-Id: I6fa34f20d0b2f898e7b5475a603111413bb80a67
2018-06-08 11:24:58 -04:00

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// 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
//
// 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 "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);
//
// FromDateTime
//
// In each "FromDateTime" 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_FromDateTime_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::FromDateTime(2014, 12, 18, 20, 16, 18, tz);
} else {
absl::FromDateTime(2013, 11, 15, 18, 30, 27, tz);
}
++i;
}
}
BENCHMARK(BM_Time_FromDateTime_Absl);
void BM_Time_FromDateTime_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_FromDateTime_Libc);
void BM_Time_FromDateTimeUTC_Absl(benchmark::State& state) {
const absl::TimeZone tz = absl::UTCTimeZone();
while (state.KeepRunning()) {
FromDateTime(2014, 12, 18, 20, 16, 18, tz);
}
}
BENCHMARK(BM_Time_FromDateTimeUTC_Absl);
void BM_Time_FromDateTimeDay0_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::FromDateTime(2014, 12, 0, 20, 16, 18, tz);
} else {
absl::FromDateTime(2013, 11, 0, 18, 30, 27, tz);
}
++i;
}
}
BENCHMARK(BM_Time_FromDateTimeDay0_Absl);
void BM_Time_FromDateTimeDay0_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_FromDateTimeDay0_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
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